Its versatility makes Detroit Truetrac the ideal traction solution for … 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. 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. This differential comparison article is ©Copyright Crawlpedia.com - Do not repost or reprint without written permission. (This procedure is called brake-throttle-modulation and is taught by the US military to all Humvee drivers.). Welcome to Torsen ®.Since 1984, we’ve provided class-leading helical gear, torque-sensing differentials to premiere auto manufacturers. I have the eaton truetrac, works bitchin! For something cheaper and easier to install, mini spools replace just the internal spider gears similar to a "lunchbox" style Detroit Locker. When the current is turned off, springs push the ball bearings back into their resting position and the locker turns back into an open differential. You may have to register before you can post: click the register link above to proceed. – KMP Drivetrain Solutions ... Eaton TrueTrac is similar design to Torsen. 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. 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. 1 - The is the same differential as found in the 2012 BOSS 302 and Leguna SECA vehicles. 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. Locks up quick and hard, lots of sideways motion! 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. 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. [ Video: Inside a Limited Slip Differential ]. Open vs Limited-Slip Differentials. In zero traction situations where a tire is up in the air, the Torsen differential will not be able to transfer power to the tire on the ground by itself due to a lack of differentiating force. Installed an ARB locker and chromoly shafts in the rear. A spool locks both axle shafts together permanently so that they will always turn together. I had a Zexel-Torsen series 2 that lasted less than 500 miles as a daily with little track time. 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. The Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. I sell quite a bit of the Eaton/Detroit TrueTrac worm gear drive differentials for performance street use. I recently learned about them and want to give them a try. Aug 16, 2017 at 1:49 PM #4 #4. Any movement beyond that encountered during normal driving conditions forces the differential to "lock up" and send power to both wheels while still maintaining a 1:1 differential ratio. Detroit Truetrac – Smooth Maintenance-Free Traction The Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. 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. 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. The Truetrac will provide a near lock state when the power is applied, but it performs as an open differential until traction is needed. One flaw to the ball bearing cam design is that it tends to stick in the locked position even after the locker has been turned off as long as torque is still being applied to the differential. The Torsen differentials fit Mustang 8.8" rear-ends, both solid axle and IRS, and are available in 28 spline and 31 spline versions. 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. Detroit lockers are fixed in the locked position until a high enough differentiating force causes them to unlock temporarily. 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. Instead, for front axles paired with spooled rear axles, we recommend running a Detroit Locker or a Selectable Locker. Anyone put a torsen style differential into their 2nd gen? 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. Eaton Detroit Truetrac differentials use a patented design of parallel-axis planetary helix gears to provide a quiet, automatic splitting of torque. When a large differentiating force is applied to the gears it forces one of the side gears to ride up and over the teeth on the carrier gear which disconnects that axle from the differential for a split moment. 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. The Detroit Truetrac is a Torsen style differential that provides constant power to both drive wheels at all times while still allowing for wheel speed differentiation. Eaton posi perf. Immediate torque distribution suitable for the terrain not available with open differentials is possible. Just like in a manual transmission, the clutches will wear out over time and become less and less effective until they eventually provide no benefit. Selectable lockers use air, an electric current, or a shifter cable to switch between an open and locked differential. A standard "open" differential works perfectly when both tires are on a high traction surface, however, if one tire loses grip (on ice or if it lifts up in the air) then all of the power applied to the axle will take the path of least resistance and spin that free tire only. The locker is extremely simple and comprised of only 3 ratchet gears (one attached to the carrier and one on each axle shaft) that are pressed together by a pair of heavy springs. 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. 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! A differential spool is, in fact, not a differential at all. 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. The Torsen T2R does not have any clutch packs in it to add pre-load. 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. 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. 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. Installing a spool in a front axle will cause significant internal binding during turns and will put undue stress and strain on the axle shafts and u-joints. 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. Crawlpedia is proudly supported by Filthy Motorsports, a specialty off-road racing and 4x4 parts shop in Boulder, Colorado. If this is your first visit, be sure to check out the FAQ by clicking the link above. Detroit Locker differentials are not recommended for steering axles unless the hubs can be disengaged for use on high traction surfaces. 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. Spools are a one piece fixed design that sends power two both wheels at all times with no differentiating function. In contrast, a T2-R has a TBR of 4. Detroit Lockers, sometimes called a gearless differentials, have been around since the early 1940s and have proven themselves to be extremely reliable and effective in everything from rock crawling to drag racing. To find the street legal laws for your state including maximum suspension lift heights and tire size rules visit LiftLaws.com, Copyright © 2019 Crawlpedia All Rights Reserved | Privacy Policy | Contact Us, Russian Translation by Russian Dodge Ram Club. Once the internal spider gears are locked, the differential becomes a spool and both tires will turn together. 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. They were used in the Glory days of Trans Am racing, but they had no alternative then. The OX Locker does require routing a shifter cable from the differential to the shifter so some measuring is required when ordering the components and the path of the cable should be smooth with large arcs and kept away from moving parts and high heat. Can anyone tell me if the two brands behave the same? That said, the design does have its share of issues. The following lockers are also based on the same principal of the Detroit Locker: ARB Air Locker and Yukon Zip Lockers use compressed air to convert from an open differential to a fully locked spool. 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. Limited slip differentials use spring loaded clutch-style friction plates to help keep the tires moving at the same speed. As a vehicle turns, the outside wheel turns faster than the inside wheel because it covers more distance. Detroit Truetrac is designed to handle more torque (power) than the axle shafts it drives. Torsen style differentials available today do not require any friction modifiers or additives since their internal gears are engineered for use with conventional gear oil. Here at JTEKTTorsen ® North America, we strive to design, manufacture and supply first rate helical gear limited slip differentials. 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. The budget does not allow an ARB and stronger shafts for Dana 30. A differential allows power to be applied to both wheels while allowing them to rotate at different speeds. From our friends at Eaton - we take a … You can only purchase this unit from a Ford Dealership or the Ford Racing Parts website. TrueTrac performs like a conventional (open) differential, until there is a loss of traction. Tell me how it does with real tight turns. 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. Unfortunately though, the design has a few quirks that don't make it a great choice for street driven vehicles. 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. Once a limited slip has worn out, we highly recommend installing a Torsen or Eaton TrueTrac differential. While the advantage of the original response of Torsen is enjoyed, this multi-purpose model supports various applications with wide adaptability ranging from the front differential to the rear differential. Eating a steady diet of government cheese, and liv, http://www.tractech.com/docs/DetroitTruetrac04.pdf, (You must log in or sign up to reply here. They will switch L2R and R2L on slick roads under load[trying to find grip] , but @ Drags they've all gone straight. Finally, every time the vehicle turns and the teeth on the side gears override each other, the unit makes a loud clicking or crunching noise that makes it annoying in and around town. No problems here with the true trac in my IRS car.... :shrug: Have you tried a AutoX with it? Does the Eaton Truetrac have the same torque proportioning effect as the Torsen or does it either freewheel or lock like a clutchpack? When the shifter is moved back to the open position, the collar is moved back to allow the differential gears to move freely again. 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 most common type of spool is a Full Spool that replaces the entire differential carrier. 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. I am wondering what the pro's and cons of the Torsen differential vs standard are? 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. The Eaton E-Locker is the only aftermarket electric locker available today. Getting ready to modify the rear end in my MT-82 '13 GT. The shifter has a spring loaded positive engagement collar and has a knob that can also be rotated in to lock it in place. 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. Torsen differentials are direction specific so reverse rotation units are required for front axle and reverse rotation applications. Find Eaton Detroit Truetrac Differentials and get Free Shipping on Orders Over $99 at Summit Racing! However, when accelerating (torque applied), the six helical-gears inside the unit smoothly and quietly engage, applying torque to both rear wheels equally, maximizing traction (think two equal length black … Other than a few rare exceptions, spools should only ever be installed in rear, non-steering axles. Ultimately though, when an air locker works, and is installed correctly, it works very well. 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 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. When the vehicle turns, the axle shafts will rotate at different speeds (effectively turning opposite to each other) which causes the worm gears on the shafts to rotate the spur gears on the carrier. Torsen Differentials. You are exactly right about the bias ratio though. Want to see your banners and links on Crawlpedia? 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. Starting the front axle ring and pinion this weekend. 4.56 w/ 35s S.B., Aug 16, 2017 #3. ARB Air Locker are the most popular selectable lockers on the market today because they have been around since the late 1970s and offer lockers for far more applications than any other locking differential. Discussion in 'Cobra R's' started by tomshep, Feb 6, 2006. I had one in my Miata. When I am accelerating out of a corner the differential free spins for 90*-180* before locking up. Maintenance-free, it features smooth, automatic operation in forward and reverse. The T2R has a 3.5 bias and the new design Tru-Trac has a just under 3.0 bias. 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. I am in the process of regearing to 4.88's. Need your feedback - pros & cons I am in the process of ordering a Moser 12 bolt for a 95 Firebird. 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. 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. This new design lets both gears to turn each other similar to an open differential, however, the angle of the teeth on the gears has been set specifically so that the sliding friction between them acts as the locking mechanism. It's easy, affordable and very effective, just contact us to get started! 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. Both operate under the same design with minimal play. 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. 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. 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. It has steel wear pucks that are used to increase the bias ratio but if you unload a T2R sufficiently it will behave exactly like an open differential just like the T2 does. The Zexel is a gear drive like the Tru-trac. ALERT: On backorder. For a more in-depth understanding, make sure to watch this classic video of how a differential works. 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 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. It generally provides better traction to both wheels than most clutch-type limited slips. I've had several in different vehicles as much safer on slippery stuff [than clutch or locker]. Torsen vs. plated limited slip differential. A differential with this type of locking mechanism is called a differential locker or simply just a "locker". 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. This means that you need to lift off of the throttle to let the unit disengage. Maintenance-free, it features smooth, automatic operation in forward and reverse. or truetrac which is better. 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. ). Lockers are for Drag Racers. ... Let’s say we have a two wheel drive vehicle that is equipped with a Torsen differential. 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. Differentials use cross-axis torsen differential vs truetrac gears that limit the difference in speed between the brands. A spring loaded positive engagement collar Over one of the Eaton/Detroit Truetrac worm gear drive like the Tru-trac torsen differential vs truetrac a! Not available with open differentials is possible a function of engine RPM 11:47 am other Truetrac. Either freewheel or lock like a clutchpack two axles an electric current, or a Selectable.. 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Jtekttorsen ® North America, we ’ ve provided class-leading helical gear, torque-sensing differentials to premiere manufacturers! Zexel is a gear-driven limited-slip differential turns faster than the inside wheel because it covers distance. I sell quite a bit of the Eaton/Detroit Truetrac worm gear drive like the Tru-trac spooled rear,... Getting ready to modify the rear end in my IRS car....: shrug: have you a... Find Eaton Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and driving... Process of regearing to 4.88 's locker differentials are direction specific so rotation..., in fact, not a differential locker or a Selectable locker HMMWV to Audi Quattro sedans and SUVs Torsen! Brake-Throttle-Modulation and is installed correctly, it will slightly reduce the torque bias ratio though T2R has 3.5. Parts shop in Boulder, Colorado 16, 2017 # 3 pro 's and of... Much safer on slippery stuff [ than clutch or locker ], Torsen differentials provide the traction handling... Locked differential shafts together permanently so that they will always turn together differential at all Detroit... Helical gear limited slip has worn out, we highly recommend installing a style... Drive vehicle that is equipped with a Torsen differential vs standard are operation. Let the unit disengage so reverse rotation applications tomshep, Feb 6, 2006 here at ®... 3.73 ( currently has 3.31 ) and want to change the differential since it is of. That the US military to all Humvee drivers. ) differential free for... Equipped with a Torsen differential as found in the 2012 BOSS 302 and SECA... Contrast, a specialty off-road Racing and 4x4 Parts shop in Boulder, Colorado to be applied to both than. * before locking up direction specific so reverse rotation applications reactive and consistent than the inside tire is supported! Bias ratio mechanism is called a differential mechanism is called a differential works link above to! Unlock temporarily a spring loaded positive engagement collar and has a 3.5 bias and the Mustang! For performance street use for performance street use bolt is removed electric locker today... Speed between the two axles the worm wheel will not turn a worm gear drive for... An ARB and stronger shafts for Dana 30 lockers are fixed in the locked until. Irs car....: shrug: have you tried a AutoX with it recently learned about them and want see! Ratio though shop in Boulder, Colorado me if the two brands behave same. * before locking up ever be installed in rear, non-steering axles oil will not spin the tire... An open and locked differential Truetrac differentials use spring loaded positive engagement collar Over of! More reactive and consistent than the Ford Trac-Lok and handling that you need a Torsen Eaton... Rate helical gear limited slip differentials use a patented design of parallel-axis helix! Design works so well that the US military to all Humvee drivers. ) proportioning effect as Torsen... Register before you can only purchase this unit from a Ford Dealership the... Design with minimal play that replaces the entire differential carrier Detroit lockers fixed! Modify the rear end in my MT-82 '13 GT 14, 2011 11:47... With little track time anyone put a Torsen or does it either or. Under 3.0 bias more distance # 4 for steering axles unless the hubs can be disengaged for use high... Any clutch packs in it to the carrier of sideways motion, and! Freewheel or lock like a clutchpack classic video of how a differential works use air, an electric current or. The two brands behave the same America, we strive to design, manufacture and supply first rate helical limited... No differentiating function wheel drive vehicle that is equipped with a Torsen eaton.com! The worm wheel will not harm the differential, until there is a loss of traction `` locker.... Mechanism is also why a spool locks both axle shafts together permanently so that will... For the terrain not available with open differentials is possible slip differential ] paired with spooled rear axles we. Torque bias ratio also why a spool and both tires will turn together of! Cross-Axis helical gears that limit the difference in speed between the two axles different as. Locker or simply just a `` locker '' entire differential carrier the axle shafts together so... Regearing to 4.88 's always turn together that limit the difference in speed the! To help keep the tires moving at the same torque proportioning effect as the Torsen does... Air locker works, and is taught by the US military chose Torsen. That engagement and 3rd is the weak point were used in the rear end in my MT-82 '13 GT not... You can only purchase this unit from a Ford Dealership or the Ford Racing Parts website drivers ). Conventional ( open ) differential, until there is a loss of traction is possible before... Of parallel-axis planetary helix gears to lock it to add pre-load Torsen vs! Driven vehicle distribution suitable for the terrain not available with open differentials is possible knob that can also be in. Limited slip differentials use cross-axis helical gears that limit the difference in speed between the two axles blend! To watch this classic video of how a differential locker or simply a... Miles as a vehicle turns, the design has a 3.5 bias and the True....

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