Under normal light throttle driving conditions, a Truetrac operates much like a standard open differential, allowing the rear wheels to rotate at slightly different speeds for smooth cornering. Horsepower has little influence on the differential since it is more of a function of engine RPM. At the differential, the shifter cable moves a shift fork that slides an internal engagement collar over one of the side gears to lock its movement to the carrier. The typical Torsen® torque-biasing differential is the T2 model, and that was standard in the Boss 302 Laguna Seca, and optional in non-LS Bosses. Detroit Truetrac Lockers are maintenance free, fully mechanical, Torsen style limited slip differentials with helical gears instead of clutch packs (which wear out over time) to provide constant torque to both wheels while still allowing for smooth turns on pavement. It's easy, affordable and very effective, just contact us to get started! Once a limited slip has worn out, we highly recommend installing a Torsen or Eaton TrueTrac differential. You are exactly right about the bias ratio though. Ultimately though, when an air locker works, and is installed correctly, it works very well. It generally provides better traction to both wheels than most clutch-type limited slips. [ Video: Inside a Limited Slip Differential ]. Using synthetic blend or full synthetic gear oil will not harm the differential, although, it will slightly reduce the torque bias ratio. Limited slip differentials use spring loaded clutch-style friction plates to help keep the tires moving at the same speed. Help me decide on either an Eaton posi or Detroit Truetrac differential June 14, 2011, 11:47 AM. The majority use Tru-track or Torsen, the new Mustang GT-350R comes with a Torsen. When I am accelerating out of a corner the differential free spins for 90*-180* before locking up. I recently learned about them and want to give them a try. From the military AM General HMMWV to Audi Quattro sedans and SUVs, Torsen differentials provide the traction and handling that you need. 4.56 w/ 35s S.B., Aug 16, 2017 #3. Once the air pressure is released, internal springs will push the engagement collar back to its resting position and the locker becomes and open differential again. The drivetrain is absorbing that engagement and 3rd is the weak point. The Torsen T2R does not have any clutch packs in it to add pre-load. I sell quite a bit of the Eaton/Detroit TrueTrac worm gear drive differentials for performance street use. Eaton posi perf. Detroit lockers are available as complete carrier differentials as well as smaller units nicknamed "lunchbox lockers" that replace just the spider gears in an open differential carrier. E-lockers are the easiest type of selectable locker to install because only one small wire needs to be run from a switch on the dash to the differential. Current versions of the Torsen, like the TrueTrac, have moved away from spur and worm gears in favor of worm wheels that allow for smoother operation. There are also many things that can easy fail or go wrong ranging from leaking air lines to damaged O-rings to failed electrical connections, or even a blown fuse. No problems here with the true trac in my IRS car.... :shrug: Have you tried a AutoX with it? Going with 3.73 (currently has 3.31) and want to change the differential to something more reactive and consistent than the Ford Trac-Lok. The design works so well that the US military chose the Torsen differential as standard equipment on the Hummer. The T2 used in the Boss has a torque bias ratio (TBR) of 2.5, so the wheel with traction can get up to 2.5 times the torque than the wheel with less traction. The locking system is overly complicated in that it requires an electric switch to open an electric solenoid and run an air compressor to provide air to the differential and mechanically lock the spider gears. Locking differentials come in various forms and functions ranging from a mild limited slip found in many OEM applications all the way to a race-only spool that permanently locks the wheels together and has no differentiating function. I had a Zexel-Torsen series 2 that lasted less than 500 miles as a daily with little track time. Anyone put a torsen style differential into their 2nd gen? Locks up quick and hard, lots of sideways motion! 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. ALERT: On backorder. While there have been many unique differential designs that have come and gone over the years, the most popular locking differentials used today are the following: Limited slip differentials, also known as Posi or Trac-Lock differentials, use clutches and springs to increase the friction of the differential gears to prevent them from turning at different speeds. Spools are used exclusively for desert racing, hill climbing, mud racing and other off-road applications where a differential is not needed and reliability and strength are critical. About Torsen ®. Locker vs Truetrac / Torsen / Wavetrac on Road Course - track time comparison? While most limited slip differentials can be rebuilt, it's tough to justify the cost knowing that it will wear out again and again, whereas a Torsen differential does the job better and the all gear design will never need servicing. An aggressively set limited slip differential will force the two tires to spin together while a lightly tuned limited slip will only transfer minimal power. I am in the process of regearing to 4.88's. Toresn style differentials including the Eaton TrueTrac work on the simple principal of worm gears in that a worm gear can turn a spur gear but a spur gear cannot turn a worm gear. In this article we will go over the most popular aftermarket differentials available today, in detail, so you can choose the right one for your application. To prevent power from going to a wheel with little or no traction, a locking mechanism is needed to shift that power over to the tire with more traction so that the vehicle can continue moving forward. Starting the front axle ring and pinion this weekend. For something cheaper and easier to install, mini spools replace just the internal spider gears similar to a "lunchbox" style Detroit Locker. While it may be tough to visualize, in a Torsen differential, power is applied to spur gears attached to the differential carrier that then rotate a worm gear on each axle shaft. At the differential, the airline feeds a collar that sits up against the bearings and has 2 O-rings between which the air flows through a small hole in the bearing journal. For a more in-depth understanding, make sure to watch this classic video of how a differential works. Another cool feature of the Ox Locker is that in the event of a cable failure, a Drive Away Lock (sold separately) can be inserted into the diff cover to lock the differential into the locked position. Can anyone tell me if the two brands behave the same? Detroit lockers are fixed in the locked position until a high enough differentiating force causes them to unlock temporarily. Its versatility makes Detroit Truetrac the ideal traction solution for … Due to its design, the Detroit locker is ideal for trail running, rock crawling, off-road racing, drag racing, and heavy commercial equipment. Unfortunately though, the design has a few quirks that don't make it a great choice for street driven vehicles. Maintenance-free, it features smooth, automatic operation in forward and reverse. The most common type of spool is a Full Spool that replaces the entire differential carrier. If this Torsen diff has a TBR of 2:1, the tire with more grip would only be able to provide twice the amount of torque that is provided to the tire with less grip. This means that you need to lift off of the throttle to let the unit disengage. Truetrac® differentials are unique in that they increase traction but do not affect steering or wear out prematurely; these problems are common with limited-slip differentials that use clutch plates and springs. I am wondering what the pro's and cons of the Torsen differential vs standard are? Detroit locker style lunchbox lockers are offered by various manufacturers and are very popular because they are affordable, effective, and do not require removing the differential from the vehicle to install them. The HUGE advantage of the Torsen Differential (Torsen stands for Torque Sensing) is that it puts the power to the tire with the most traction. Compressed air from an air compressor, air tank, or CO2 tank flows through an airline to an electric solenoid valve that opens to allow air flow to the air locker at the flip of a switch. This turns the locker into a spool until the Drive Away Lock bolt is removed. Finally, there's the backyard engineering way of permanently converting an open differential into a spool by welding the spider gears together which is commonly called a "Lincoln locker" (named after the welder brand). Toresn style differentials including the Eaton TrueTrac work on the simple principal of worm gears in that a worm gear can turn a spur gear but a spur gear cannot turn a worm gear. Torsen ®: Geared for the Road Ahead. Tell me how it does with real tight turns. The Zexel is a gear drive like the Tru-trac. Crawlpedia is proudly supported by Filthy Motorsports, a specialty off-road racing and 4x4 parts shop in Boulder, Colorado. Displaying 1 - 3 of 3 results Sort: Product Image Product(s) Part # Torsen T-2R torque-bias differential, High Bias, Ford 8.8” differential. Modern automotive differentials are available in many different styles ranging from standard open differentials, to limited slip models, to selectable and automatic lockers, and fixed spools that have no differential function at all. Along the same lines, when the unit is engaged, shifting from forward to reverse (or vice versa) requires the cams to unwind and rotate backwards to re-engage in the opposite direction which can feel a bit sloppy or clunky at times. Does the Eaton Truetrac have the same torque proportioning effect as the Torsen or does it either freewheel or lock like a clutchpack? I had one in my Miata. Here at JTEKTTorsen ® North America, we strive to design, manufacture and supply first rate helical gear limited slip differentials. The T2R has a 3.5 bias and the new design Tru-Trac has a just under 3.0 bias. Unlike most locking differentials that are open and use a locking system to lock the axles together, the Detroit locker rests in the locked position and only unlocks temporarily when a large enough differentiating force is applied to it. Electric lockers, or E-Lockers as they are more commonly called, use an electric current to engage the locking mechanism in the carrier to convert from an open differential to a spool. The Eaton Truetrac is available for the rear axle of 1500s and LOOKS similar to the Torsen design but it works on a somewhat different principle. The key to a well performing limited slip differential is selecting the proper friction plates, spring load, gear oil, and friction modifiers for the given application. Auburn Gear makes and electric locker called the Ected Max-Locker that is both a clutch style limited slip and an electric locker, however, we don't recommend this unit for the same reasons we don't recommend limited slip differentials. This differential comparison article is ©Copyright Crawlpedia.com - Do not repost or reprint without written permission. A quick solution to this problem is to apply the brake slightly to provide resistance to the free wheel and then apply the gas to lock the Torsen mechanism. Because this ratio is locked, even if one tire is spinning on ice, the other tire will be forced to turn and move the vehicle forward. In more specific terms, an electric current energizes an electromagnet that puts pressure on a series of ball bearing cams that use the rotational force of the differential to lock one of the side gears to the differential carrier. The Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. Additionally, because the unit requires quite a bit of differentiating force to disengage, driving in low traction conditions like rain or snow can be a bit unnerving because the Detroit Locker tends to stick or open unexpectedly. Need your feedback - pros & cons I am in the process of ordering a Moser 12 bolt for a 95 Firebird. Both operate under the same design with minimal play. I have the eaton truetrac, works bitchin! When the shifter is moved back to the open position, the collar is moved back to allow the differential gears to move freely again. The biggest problem with limited slip differentials is that every time the vehicle turns and the tires are forced to spin at different speeds, the clutches are rubbing against each other and causing wear. I've had several in different vehicles as much safer on slippery stuff [than clutch or locker]. A spool locks both axle shafts together permanently so that they will always turn together. OX Off Road, LLC has developed a manually engaging locker called the OX Locker that locks and unlocks using a cab mounted shift lever that is connected to the differential by a shifter cable. They will switch L2R and R2L on slick roads under load[trying to find grip] , but @ Drags they've all gone straight. The Torsen differentials fit Mustang 8.8" rear-ends, both solid axle and IRS, and are available in 28 spline and 31 spline versions. Other than a few rare exceptions, spools should only ever be installed in rear, non-steering axles. Spools are a one piece fixed design that sends power two both wheels at all times with no differentiating function. The Truetrac will provide a near lock state when the power is applied, but it performs as an open differential until traction is needed. While many modern trucks, Jeeps, and SUVS offer and optional e-locker from the factory, they are often sourced from overseas manufactures and built to much lower standards. I am going to try a true trac..I just broke my rearend again for the 2nd time lastnight,first pass out this year.I broke axle and cracked torsen last pass last year and installed strange axles and FFRP cobra diff.I havent got it torn down yet but feels like spiders let go! I saw on an americanmuscle video recently that the guy selected a non performance pack for a few reasons , one being brakes getting in the way of his plans (im assuming lightweight drag wheels) and also said the torsen differential would just get in the way. To engage the locker, you simply move the shift lever into the locked position and to disengage the locker you move it back to the open position. In the event that one wheel loses all traction, power will still be transmitted through the clutches to the other tire up to the threshold of the friction plates. Immediate torque distribution suitable for the terrain not available with open differentials is possible. The principle is that you can drive a worm wheel with a worm gear, but because of the angle of attack between the gears you cannot back-drive a worm gear (i.e. ). As a vehicle turns, the outside wheel turns faster than the inside wheel because it covers more distance. 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