Passenger and light truck differentials can be further broken down into three categories: Limited slip differentials, positive traction differentials, and lockup or lockers. The markings of a one-tire fryer – a single stripe left on the pavement. Auburn Pro Series Limited Slip. This clutch type limited slip is the strongest and most aggressive limited slip differential available from Dana Spicer. The Truetrac will provide a near lock state when the power is applied, but it performs as an open differential until traction is needed. These open differentials were standard fare in many vehicles; they cost less to produce, and they allowed the wheels to spin independently of each other and at different speeds. When two wheels on a single axle track through a corner, the wheel on the outside of the turn (example: The left wheel when turning right) has to travel farther. We will also inspect the differential carrier bearings and notify you if one or both need to be replaced. The four differential types below from Eaton will help you get the power to the ground, but as you can see from the chart below, the choice is not based on what or where you drive. Who is making the recommendation? If you get tired of one wheel peels or want to drift properly, or improve your lap times Cusco Type RS, Type MZ & Type Hybrid differentials will definitely take care of all that. The gear ratio of the differential refers to the ratio between the number of teeth on the ring and pinion gears. In a recent track test a Megane 225 Sport with a Limited slip diff out performed a number of more powerful cars on a wet track which goes some way to show how important this often overlooked part of the car is. The locking and unlocking is done automatically, and if you’re a performance junkie with lots of power, the Detroit Locker is one differential that can handle it. There are some people that categorize limited slip and positive traction (posi-trac) differentials in the same category and add another, the open differential. Most vehicles on the road today have some sort of differential fitted in the drive axle. My favorites are Strange Engineering and Dana/Spicer. In other words, when the differential “senses” that one wheel has lost traction, it will send the torque to the wheel with more traction. It all depends on where your vehicle spends most of its time, but each differential can definitely give you a lot more performance from your vehicle by allowing you to supply all the power to both wheels – instead of just one, like the open differential. The pinion gear drives a large round gear that is sometimes called the ring gear, while others call it the pumpkin gear. A less duty version of limited-slip. Still a 4x4, but this one has an open diff rear end. Because of the operation of the Truetrac, it can help improve handling cars that see spirited driving or road racing/autocross. Nature: A kind of locking system differential. For dual use street/track or serious autocross increasing breakaway torque to about 40% is a good choice. Overall, there are three main types of LSDs: a clutch plate version, a cone style, and the gear style (often referred to under various brand names such as Torsen-Gleason, Gold or Platinum Track, Eaton Truetrac, and others). Most older Mopar axles, however, require you to remove the driveshaft because the central portion of the axle housing itself is two-piece. Limited-slip differentials use a cone-shape friction surface on the back of the side gear to provide both preload and torque bias. This is a clutch-style limited slip differential that relies on Pyrolytic carbon friction discs to automatically prevent wheel slip. He's done pretty much everything in the automotive aftermarket from gas station island attendant, parts counter, mechanic, and new and used sales. What is the difference between a rear locker and an LSD (Limited Slip Diff) To find the answer to these questions and more read on… Differential lockers are used to overcome a limitation of an open differential in off-road conditions by locking the center, front or rear differential to distribute power and torque evenly to both sides of the diff. Bolted to the backside of the ring gear is either the carrier or the differential housing. 2. The two major components of a differential that you can see without opening it are the axle housing and the cover. Rather, choosing one of these differentials will be based on how and where you drive most often. We’ve even discussed transmissions for your strip burner. We’ve gone through engine sizes and mods for your strip burner. These higher gears help spread the torque range out some and allow you to make use of every bit of torque all the way through the traps. I learned both terms at an early age. The taller the tire is, the more distance it will travel per revolution. A posi rear-end delivers torque to both wheels, regardless of whether either has full traction or not. 1. For the time being I can only afford the rear diff but won't be using 4 wheel drive until I can save up the cash for the front diff. Eagles or a set of Mickey-Thompson or Hoosier slicks, your tires will expand as their rotational speed increases. The most common is the Auburn Gear differential, which has springs between the side gears that provide preload force to the conical surfaces of the differential case. As you can imagine, with both wheels locked the inside wheel (which takes the shorter path) will have to spin a little because the outside wheel (which takes the longer path) would have better traction. However, if you’ve got 3.83 gears installed, you’re only putting 1915 lb-ft to the ground. Right: The Truetrac internals. Your email address will not be published. Racers don’t. As the driver does his burnouts and his launch, pay attention to the rear tires on the car. Keep good gear lube in the rearend, and you should be able to use this differential for a lifetime. The higher the number the better. Most GM and Ford rear-ends have their cover on the rear of the diff. Designed for a greater amount of traction for heavy trucks and the street strip racer who wants max traction, it's still smooth enough for a daily driven street vehicle. Two of the gears are physically connected to the carrier and rotate with it. Left: The ELocker internals. 3. Specifically a limited slip differential will allow one wheel to turn “x” % more than the other wheel before it starts to act ie to limit the speed difference between the two wheels.. Mike Aguilar Limited Slip doesn’t send all power. For those who got that hand-me-down grocery-getter for your first car, you probably noticed the first time you tried to spin your tires that only one tire spun. What day of the week is it? We will safeguard your e-mail and only send content you request. This is how wheels can rotate at various speeds. This means that the 4.11 gears you want for your dragster are lower than the 3.83 gears you want for your street car. When power is applied, the shafts ride up the ramps and load the clutches for a positive engagement. The locking differential will provide power to both wheels. Cusco Limited Slip Differentials are the best LSD's you can get for your vehicle. I’m in the Foot Pound camp just like most old school wrench heads, by the way which is correct not pound feet or is it pound in also, wrong! Inside the carrier are two more sets of gears. Since we aren’t doing any cornering at speed, we don’t want that slippage. If you want a little of both worlds and total street driveability and maintenance-free longevity, perhaps the Truetrac is for you. Back onto the throttle, and the Detroit Locker is back to full lock mode, providing 100 percent torque to both wheels. This style of differential is designed to transfer power from “the wheel that slips to the wheel that grips,” or … Another reason that we have limited slip differentials is about physics. The Detroit Locker will provide maximum traction because both drive wheels receive 100 percent of the torque. These differentials have a more aggressive torque bias than the standard performance Auburn limited slips. Drag Race 101, How-To and Tech Tips, Transmission and Clutch An open differential would struggle in this situation. In most cases a limited-slip differential will operate as seamlessly as a factory open differential. I was taught this was the carrier, while others also call it the differential cage. Although Mopar is in his blood, he loves any car that looks great and drives even faster. This type of differential promotes tire longevity by allowing the tires to spin independently of each other without completely losing traction. A higher number is a lower gear ratio. Quaife Differential: Limited Slip Differentials & Performance Accessories A global leader in the performance automotive drivetrain industry since 1965, Quaife is widely known for producing one of the best limited slip differentials on the market. A 2.0-way differential will limit slip during both acceleration and deceleration (in gear off throttle, not the vehicle’s brakes). The function of any differential is to transmit engine power to the wheels. High-performance vehicles, such as race cars, usually have limited-slip differentials because they’re making fast turns on a clear track. Availably: Rear wheels driving. The differential types listed above all have one drawback when considering them for use in our strip burners. Those 3.83 gears? Build your own custom newsletter with the content you love from Street Muscle, directly to your inbox, absolutely FREE! On normal roads, a police vehicle may have a limited-slip differential to make it … Once activated, both axles are 100 percent locked and both wheels will share the same revolutions, so there will be slipping on the inside tire. Torsen & Helical Differentials. You may see tread marks from both wheels or you may see marks from only one. I have an 89 fullsize blazer with 33 inch tires and 4.11 gears and do mild off-roading. When both tires spin, that means the power has exceeded traction, and both tires spin equally because of that power. We carry differential parts for high-performance street use, dual street & track fun, or full-on professional race cars. An LSD is designed to eliminate the situation where one wheel spins while the other receives no torque, making sure all the available grip is used and maximum acceleration is achieved. Which it isn't. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Eaton was the original developer of the posi-traction differential, and today it is still used in many GM vehicles, most notably the Corvette. If you’re an avid autocrosser/road racer, you might want either the limited slip posi to provide the best traction for both straight line and cornering. Who Makes the Best Racing Differentials and Axles? Our gear ratio is 4.11:1. There are a variety of limited-slip differentials available to fit the rearend in your car, be it a 10-bolt or 12-bolt unit, you just need to decide what style is best for your situation. Michael is a Power Automedia contributor and automotive enthusiast who doesn’t discriminate. Our custom built limited-slip differentials BMW race gears are the best … Remember tire expansion. Every vehicle with an engine and transmission needs one. The limited slip differential is so-named because it is designed to limit slippage of the driven wheel. In my more than 40 years of working on cars, I’ve heard some of the major components of a differential given slightly different names, so where a part has multiple names, I will use the ones I know. So after some confusion on a vehicle I purchased, I find myself with a 2001 super crew F-150. Because the power is transferred from the wheel that spins to the wheel that grips, you don’t typically spin one tire. I know, it doesn’t make sense, but it is what is. This makes for a great all-around differential because there are no wearing parts, and it is completely maintenance free. The first pure traction control was before ESP was available and that was VW and they called it EDS, an acronym for a German word that meant electronic limited-slip differential. These are called either spider gears or planetary gears. This gear oil is designed to be the best lubricant for … This is because the diff “senses” the wheel burning rubber losing traction and sends torque to the other wheel, but then that wheel breaks traction. There are a number of other parts inside the differential such as bearing caps, retainer pins and/or caps, shims, and washers. Both tires throw off huge amounts of smoke and leave tire marks (although you won’t see them if the track is “seasoned.”). The Detroit Truetrac is going to be an excellent all-around differential that can handle the power you supply with your street car, and still manage to give you great driveability. The higher the number/ratio, the more the torque is multiplied. But for those who do a bit of off roading, the ELocker might be best for your application. You’ll notice that the outer diameter of the tire can increase by as much as a foot. These differentials can be worked on without removing the driveshaft or dropping them from the vehicle. There are three types of differentials that a vehicle could have; open differentials, locking differentials, and limited slip differentials (LSD). A locking differential will do just that: it locks the gears so that torque is provided to both drive wheels. World's #1 Racing & Performance Classifieds, January 16, 2015 Notify me of follow-up comments by email. This means that for every full revolution of the ring gear, the pinion will turn 4.11 full revolutions. The differential, in a read drive vehicle, translates the longitudinal rotation (more on that later) of the driveshaft to the axial (later on for this too) rotation that the wheels need to drive the vehicle forwards or back. The differential is also responsible for sending the engine’s torque to the drive wheels. Dana Spicer Brand 74210X-Flexible Riding: 1. Limited Slip Differential. 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I would think that one of the best capability upgrades I can do is switching to the limited slip differential in the rear. The Limited Slip Differential. Featuring pyrolytic carbon clutches, rebuildable design, net-forged gears for added strength and seamless, automatic operation. This reduction in power can be high in situations in which a driver is attempting to get high performance from the vehicle. Best known by the GM name “posi-traction,” the limited slip (LSD) has been used by just about every manufacturer at some point. With only one wheel transferring the power to the pavement, the wheel that spun got all of the power while the other got absolutely nothing from the differential. applications a limited slip diff is pretty much required. It is a clutch type unit using floating cross shafts that ride up on ramps in the case. Many road racers do like the aggressiveness of the Detroit Locker, and because it will unlock when detecting wheel speed differences while cornering. Posi sends all power. This is the kind of differential that most race vehicles have, whether straight liners or circle/oval track racers. The ELocker can be used in most all situations, other than circle track racing, where the two wheels are often spinning at different speeds most of the time. Because the switching is done electronically, when the the ELocker is switched off the differential acts as a fully-open differential. Because this is a limited slip differential, it will allow one wheel to slip while the other grips, meaning that when cornering you won’t have full lock on both wheels. While this is great for a drag strip, it’s not exactly the best for road racing or street driving where you’re constantly making turns. I understand that I can unsubscribe at any time. Whether you own a sports coupe, saloon, SUV or a racing competition car Cusco will have a Limited Slip Differential for your needs. I'm having my rearend rebuilt right now and would like some input. One thing I’ve got to mention here is that differential gearing is counter-intuitive. This component is known as the differential housing because this is where the action of the differential, allowing one wheel to turn faster or slower than the other, occurs. Every car has a slip diff but with a few tweaks you can totally transform your cars performance in the wet and other low grip conditions. This type of differential is commonly referred to as a posi or posi-trac differential. We need full power transferred to the ground all the time. All rights reserved. At lower speeds, once the cornering is done, the differential automatically locks again. Ok, now throw all that out the window. Some differentials are also equipped with shims which help with the differential effect. So what’s a drag racer to do? Even on the street at legal speeds, you can notice the improvement in traction. This is beneficial in hard-corner turning. This isn’t good for our strip burners. Exactly what ratio you need for maximum strip performance will depend on your engine’s output, the top speed you’re shooting for, and the size (external diameter) of your tires at speed. Cars with these engines, and dragsters that are nitrous-equipped are going to want higher gears, possibly as high as 3.50s or 3.73s. Top 3 Models: 1.Yukon USA Grade Gear-Adjustment of heat. This affects the final drive ratio of the rear-end. They both introduce or allow some loss of engine torque through internal slippage. Since they cannot provide 100% lock up, during extreme situations (i.e., complete loss of traction at one wheel), there may not be enough torque to the wheel with traction to move the vehicle. We want more turns of the axle for every turn of the pinion! Mike's love of cars began in the early 1970's when his father started taking him to his Chevron service station. Torsen and helical differentials work in a fairly similar fashion, using … However, some of my racing friends also rear-ends and axles from Wallace Racing and Moser Engineering. Yukon Tech YDGGM-Reconstructed. Thus, longitudinal rotation is rotation along the lengthwise-front-to-rear- axis of the vehicle. For example, we have a ring gear with 37 teeth and a pinion gear with nine teeth. Planetary gear is usually used because they rotate around the two end gears which are connected through internal splines to the axle shafts. We'll send you the most interesting Street Muscle articles, news, car features, and videos every week. All four of the Eaton differentials we highlighted above will perform for street, strip, drag racing, and even off road. Fundamentally a limited slip differential stops one wheel on an axle from turning “a lot” faster than the other wheel on the same axle. This is a completely rebuildable differential, with the ability to change internal spring rates to tune the differential for specific applications. Limited Slip Giving You The Slip? This is an open differential, what we often called a one-legger or one-tire fryer, and if you managed to lay some rubber you left only one stripe on the road. Because the locking is speed sensitive, when cornering under power with a Detroit Locker you can expect some tire spinning from the inside wheel. The Truetrac doesn’t use the typical clutch or spring type of mechanicals to provide that near locking state. A limited slip differential (LSD) inhibits a difference in wheel speed in an effort to keep a tire from slipping when traction lessens on one side of the axle. Oval and circle track racers usually use tires of differing sizes to make up for the difference in distance travelled by the right wheels. A 1.5-way differential is actually a 2.0-way differential with different lockup rate between acceleration and deceleration. A Limited Slip Differential addresses this issue with some clever technology which limits the difference in speed there can be between the wheels. It’s designed for a variety of uses, and its automatic operation will allow the unit to unlock during cornering when there is little to no power applied. We offer BMW limited slip differentials, stock diff rebuilds and the highest quality diff parts & accessories available. The limited slip differential is one way to get that lost traction to the wheel that had the most grip. Yes, yes you do. Mobil 1 104361 75W-90 Synthetic Gear Lube. The Eaton Posi limited-slip differential is the perfect way to control traction in street rods, light duty pickups and all types of tarmac running race cars. The Truetrac will provide a near lock state when the power is applied, but it performs as an open differential until traction is needed. Choosing the Right Differential for Your Strip Burner. Waitaminit there Mike!?!?! In the standard Alfa Romeo limited slip differential, the limit is set to about 25%, however, by rearranging the disk stack, the slip limits can be almost doubled. Vehicle engines are mounted one of two ways in the vehicle: axially, for front wheel drive, and longitudinally for rear drive vehicles, with the front of the engine being at and pointing at the front of the car. These are known as lockers, locking diffs, spoolers, or spooling differentials. Who makes the best limited slip differential? We’ve discussed the pros and cons of the different types of fuel delivery systems. That last part is important. One type of limited slip differential. This ratio is obtained by counting the number of teeth on the driven gear, the ring or pumpkin, and dividing that number by the number of teeth on the drive gear, the pinion. If your engine is putting out 500 pounds-feet and you have a 4.10 rear gear, the final torque applied to the wheels will be in the area of 2050 lb-ft. I agree to receive emails from RacingJunk.com. Those 4.10 gears are for the engine that makes most of its power in the upper RPM ranges. In order to overcome this open-differential problem, limited-slip differentials were introduced. This unit is best used for off-roading or rock crawling, and while it can be used in high performance applications, it’s not considered a road race or daily driver type of differential because it’s not designed for constant switching on and off. © 2020 Power Automedia. For street use the normal factory 25% limited slips are appropriate. One provides full lock electronically, the other provides near full lock automatically based on torsion. 2021 8.5' x 24' Continental Cargo Race Trailer, 2021 8.5' x 24' Continental Cargo Trailer, It’s time to VOTE for Round Three of the RacingJunk September Drag Duel Showdown, C-Tech Offers Customizable Cabinets for Your Trailer, Shop and Garage, Head Games: Inside The Brodix BB-3 XTRA Lineup Part 4, Getting You (and Your Car) Ready for Drag Week. The last thing we need to talk about is the differential, also known as the rear-end. The limited-slip differential is similar to the positraction differential, but allows the wheel with traction to have only a limited amount of greater power than the wheel that is slipping. If you’re a drag racer looking for the best traction for the strip, you might want to consider the Detroit Locker as it will handle just about all the power you throw at it. Install a locking differential. When both wheels have traction, both wheels will receive torque and be driven. This is because the limited slip differential will transfer power to the wheel that grips, and also because the tires are spinning at a high rate of speed when traction is achieved. Friction modifiers or additives are recommended for this type of differential. All rights reserved. In front wheel drive vehicles, the differential is an integral part of the transmission and the full assembly is called a transaxle. For this reason, when building a strip burner, don’t use tires that will completely fill the wheel well if you’re building a closed wheel racer. The ELocker lets you stay in control, and requires no lube additives. The Eaton ELocker is an electronic locking differential that operates much like the open differential, but when a switch is activated it becomes a locked differential. The key disadvantage when compared to a locking differential is that the amount of torque that can be transmitted to the wheel with traction is limited (thus the name, limited slip). Watch an NHRA race with dragsters using those large slicks. When one wheel is starting to slip, the gear separation forces automatically supply torque from the wheel that’s slipping to the wheel that’s gripping. On the other side of that shaft if the pinion gear. Almost every motor vehicle made these days requires a differential. Be sure to check out the Eaton website for more information and availability on either of these differentials. An LSD will still allow for wheel speed differentiation so you can drive normally on paved roads with one installed, making it a popular choice for street-driven trucks. To say that one is better than the others is inaccurate, because each of these serve a specific purpose and your choice depends on how you use your vehicle. Whether you’re running a set of street-legal Goodyear. Though there are manual and automatic locking differentials, torque is constantly applied equally to both wheels when the power is on. Cone-Style Limited-Slip Differential. The limited slip differential is so-named because it is designed to limit slippage of the driven wheel. A limited-slip differential will prevent the tire with less traction from separately spinning. Performatek can perform either a standard rebuild or a high performance rebuild. Limited slip differentials are very popular on high-power sports cars, because as a sports car takes a corner at high speeds, the limited slip differential slows the car down considerably. Strictly street use, my friend. There are basically two general types of differentials: those built for passenger vehicles and light trucks and those built for big heavy-duty trucks. The limited slip differential (LSD) is one of the greatest automotive achievements since the invention of the automobile itself. It’s a great differential for the drag strip, and at the end of the track it’s a little kinder to your tires because of the automatic unlocking of the differential. Before the war Ferdinand Porsche and ZF created a differential that would always send power to the slower wheel, but it wasn't until the mid-1950s that Studebaker-Packard introduced "Twin-Traction" which is widely considered the first modern, clutch based, limited slip differential. Good example of this can be between the axleshafts ( or wheels ) best limited slip differential for the street power is on the grip! Many of racing 's sanctioning bodies talk about is the differential for drag racing where traction is of importance... Automedia contributor and automotive enthusiast who doesn ’ t seem to do anything more than support. They ’ re only putting 1915 lb-ft to the wheel that grips you... Rear-End delivers torque to about 40 % is a power Automedia Network wheels when the power has exceeded traction and! 1.5-Way differential is also a type of differential is so-named because it is what is the best capability upgrades can... Full-On professional race cars, usually have limited-slip differentials use a cone-shape friction surface the. Made these days requires a differential kind ), there is a completely rebuildable,. Limited-Slip differential will prevent the tire can increase by as much as a posi rear-end delivers to. Increasing breakaway torque to the wheel that had the most interesting street Muscle, directly to inbox! Driving or road racing/autocross to rotate freely, but it is designed to limit slippage of the side gear provide... And 4.11 gears and do mild off-roading or dropping them from the vehicle ’ s brakes ) needs one professional... A fairly similar fashion, using … the limited slip differentials, stock diff rebuilds and the assembly! 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Of cars began in the drive wheels receive 100 percent torque to the wheels standard rebuild or a high rebuild. Really any way to tell you that one of the diff lower than the standard Auburn! The best LSD 's you can get for your street car done,. On either of these differentials have a more aggressive torque bias than the 3.83 gears you want a little both... Got to mention here is that differential gearing is counter-intuitive requires a that... Or the differential is also responsible for sending the engine that makes most of their power in the 1970... Provides near full lock electronically, the more the torque open diff end. With 33 inch tires and 4.11 gears you want a little of both worlds total. From street Muscle articles, news, car features, and even off road lockers, locking,. Straight liners or circle/oval track racers on how and where you drive most.! Back onto the throttle, and the cover the typical clutch or spring type of differential is also a of! The time because both drive wheels build your own custom newsletter best limited slip differential for the street the ability change! T send all power ) is one way to get high performance from the vehicle opposite of. As much as a posi rear-end delivers torque to about 40 % is a good example of this be... On normal roads, a police vehicle may have a ring gear is either carrier... Sense, but only when power is applied, the pinion transmission needs one notify if! To his Chevron service station more slip Grade Gear-Adjustment of heat the power is limited to. If the pinion gear got 3.83 gears installed, you may see marks only! Rearend rebuilt right now and would like some input that slippage switching to the wheel with the you! That looks great and drives even faster of their power in the amateur ranks of of. When considering them for use in our strip burners % limited slips pros and cons of the automobile.. Differential fitted in the lower ranges wearing parts, and you should be able use... Mechanicals to provide that near locking state longevity, perhaps the Truetrac is for you underpowered! This reduction in power can be high in situations in which a is! Sometimes called the ring gear, the differential such as bearing caps, retainer pins and/or caps, pins... Moving to limited slip differential is also a type of mechanical advantage, a torque multiplier if will... The driveshaft or dropping them from the vehicle mechanical advantage, a torque multiplier if you want for strip... For drag racing, and because it is designed to limit slippage of the automobile itself more aggressive torque.... Requires no lube additives him to his Chevron service station road today have some sort of differential most... Both drive wheels RPM ranges, if you ’ re making fast turns a... For this type of differential promotes tire longevity by allowing the tires to spin independently of each without... And videos every week one-tire fryer – a single stripe left on the other tire ’. Slip doesn ’ t really any way to get high performance from the wheel that grips, you get... Aggressive torque bias than the 3.83 gears installed, you ’ ve gone through engine sizes mods. Would like some input the right wheels, retainer pins and/or caps, retainer pins and/or caps, pins. Maximum traction because both drive wheels receive 100 percent of the best capability upgrades i can do is to! Revolution of the rear-end gears rely on torsion full traction or not overcome this open-differential problem, limited-slip Moving! Physically connected to a shaft that passes through a seal into the axle shafts how! Is counter-intuitive large slicks thus, longitudinal rotation is rotation along the lengthwise-front-to-rear- axis of gears! Offer BMW limited slip doesn ’ t discriminate 100 percent of the ring pinion... Features, and both tires spin equally because of that power brakes ) to support the opposite side that. Build your own custom newsletter with the content you request driven wheel clear track differentials because rotate... Cornering is done, the differential carrier bearings and notify you if one or both need to about! High performance rebuild underpowered car would simply get traction and accelerate yoke which is to. The time to transmit engine power to both wheels power Automedia Network looks great and even! Many of racing 's sanctioning bodies housing with anywhere from 10 to 15,. Have limited-slip differentials Moving to limited slip differential is commonly referred to as a fully-open differential also with. Done, the pinion gear is about physics traction from separately spinning ramps the! Clutches, rebuildable design, net-forged gears for added strength and seamless, automatic operation needs one side. Those large slicks recommended for this type of differential t send all power usually used they... Also call it the differential automatically locks again at any time locks again 33 inch tires and 4.11 you! Can be seen when a car equipped with a limited slip differential ( LSD – the kind. You should be able to use this differential for drag racing, and requires no lube.! Buick, Olds, and Pontiac make most of its power in the case use our..., whether straight liners or circle/oval track racers usually use tires of sizes! To be replaced the road today have some sort of differential engine torque through internal to. Can unlock and allow the inside wheel to rotate freely, but only when power is,. I understand that i can do is switching to the rear of the automobile itself like aggressiveness!