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. Billet Steel Case, Billet Steel Hat, … (1), March -Ford 8" 28 spline trac lok posi unit -100% new, not remanufactured Traction-Lok differentials optimize your vehicle's traction by transferring the power to both rear wheels. !FOLLOW US ON INSTAGRAM! 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. That causes the chatter-free clutch packs to grab and transfer power to the other wheel. Rebuildable to enable users to modify or repair normal wear without having to incur the cost of a brand new unit. These units came as an original equipment option in 65-72 12T (12 bolt GM truck), 12P (12 bolt GM passenger), 8.2" GM pass, 63-79 Cast Iron Corvettes. © 2020 Power Automedia. Muscle cars should look to Eaton's limited-slip differential for their traction answers. We promise not to use your email address for anything but exclusive updates from the Power Automedia Network. Make sure this fits by entering your model number. The ELocker lets you stay in control, and requires no lube additives. I assume by posi you mean the factory traction lock. Right: The Truetrac internals. Left: The ELocker internals. Instead, a set of helical gears rely on torsion to provide the torque to the wheel with the most traction. For the application as the original poster outlined it - a strip car that doesn't need to be much of a street car - the Locker would be fine, but he's really got to be sure about what he's willing to compromise on the street. Because of the operation of the Truetrac, it can help improve handling cars that see spirited driving or road racing/autocross. X2 The clutch-type limited slips are sure easier to live with in a lightly-loaded truck than a Detroit locker. Ford Traction-Loc. It's generally a good thing in snow/ice as both back wheels have a mechanical way of providing traction beyond the brake/traction control BLD. 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. Search videos icon. (4), December This inhibits some tire wear because even though torque is transferred to the wheel with grip, the wheel with slip is still going to do some spinning. Ford made the Equa-Lok from the late 50s to 1967. Friction modifiers or additives are recommended for this type of differential. 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. 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. An automatic locking differential can unlock and allow the inside wheel to rotate freely, but only when power is limited. Detroit Locker - Automatic "ratcheting-style" differential is known for its reliability, rugged construction, and fully-locked performance on any surface. Sweet Street Chevy: Jim Rivera’s Twin Turbo 1955 Chevy. https://www.currieenterprises.com/differential-options-explained Uses Raybestos® clutches for long life. Posi Units, Lockers & Spools: Featured Products: F9MS28 - Mini Spool for Ford 9 Inch with 28 Spline Axles ... Ford 9" / Trac-Lok Posi / Ring & Pinion Gear / Bearing Kit / Package: 2 Review(s) Your Price: $515.00 ... Ford 9" / Eaton Detroit Truetrac / Ring & Pinion Gear / Bearing Kit / Package: 0 Review(s) Your Price: $645.00 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. Because the locking is speed sensitive, when cornering under power with a Detroit Locker you can expect some tire spinning from the inside wheel. Michael is a Power Automedia contributor and automotive enthusiast who doesn’t discriminate. EXTREME TRACTION SYSTEMS FOR ANY DRIVING CONDITION. Ford Trac-Lok works fine in a street car if you have it/get it cheap but not worth spending real money to buy one. © 2017 Power Automedia. One provides full lock electronically, the other provides near full lock automatically based on torsion. Many road racers do like the aggressiveness of the Detroit Locker, and because it will unlock when detecting wheel speed differences while cornering. (2), May It seems people seem to have good luck with the 31 spline Trac Lok from reading on here. They were available in 8" and 9" differentials. All rights reserved. The wavetrac I've read is a great diff unless you have c-clips and is much more expensive than the trutrac. But for those who do a bit of off roading, the ELocker might be best for your application. Ford 8" in 28 & 31 spline, Street & Race Aggressive. Jeeps brand name for posi or limited slip. 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. The Eaton is a clutch-type unit; it will wear out. Detroit Truetrac - Helical-gear limited-slip (worm differential) is the modern replacement for the classic clutch-type posi. And it sucks the day your Eaton-equipped rear axle … My last job I worked for was at a drivetrain shop where we specialized in re manufacturing heavy duty over the road transmissions and overhauling differentials/rear ends. Back onto the throttle, and the Detroit Locker is back to full lock mode, providing 100 percent torque to both wheels. Often referred to as a “time bomb” or “Timex Posi”. The Eaton doesn't lock as well as the locker when drag racing and it is a little less smooth in corners than the Truetrac. All rights reserved. Eaton Positraction POSI LSD Clutch type, similar to Trac-Lok in design, yet far stronger and more aggressive. Because the switching is done electronically, when the the ELocker is switched off the differential acts as a fully-open differential. The Detroit Locker is best suited for off-road or severe track use where maximum traction is required, and quiet/smooth operation is less important. Posi-traction is just a GM trademark for limitid slip differentials and traction lok is fords. This is a completely rebuildable differential, with the ability to change internal spring rates to tune the differential for specific applications. We'll send you the most interesting Street Muscle articles, news, car features, and videos every week. With silky-smooth positive operation and no components to wear out, the Truetrac maintains day-one performance for the life of the unit. chrysler 9.25 trak lok 31 spline factory positraction replacement unit for limited slip equipped differentials. 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. Available in 2 performance ratings (Street & Race). The Eaton posi works well for all of the above, but not as well as the others for what they were designed. Trac-Lock Posi Unit for Ford 9" - 28 Spline - 9 Inch Brand: QP. And the fact is, Eaton's Posi units are virtually bullet proof. These units came as an original equipment option in 65-72 12T (12 bolt GM truck), 12P (12 bolt GM passenger), 8.2" GM pass, 63-79 Cast Iron Corvettes. tru-trac is a gear-style limited slip axle. THIS IS AN OE UNIT DANA SPICER 73102 OR 80754. We will safeguard your e-mail and only send content you request. The Truetrac doesn’t use the typical clutch or spring type of mechanicals to provide that near locking state. (2), April When coasting or rolling through a corner (no torque applied), the unequal speed of the inside and outside wheels causes the unit to unlock momentarily, before abruptly locking when power is applied. ... My jeep climbs right out without 4wd with the trac lok. PowerTrax produces a full line of traction products. This is a clutch-style limited slip differential that relies on Pyrolytic carbon friction discs to automatically prevent wheel slip. 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 Hellephant In The Room: Kevin Hart’s New SpeedKore Charger. 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. Though there are manual and automatic locking differentials, torque is constantly applied equally to both wheels when the power is on. These governor actuated units provide a locking differential without chatter. 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. The Truetrac will provide a near lock state when the power is applied, but it performs as an open differential until traction is needed. Check Out Our Complete 9-inch Third Members Here, Build And Price Complete 9-Inch Frontends And Rearends Here. Love my trutrac no noise. Video Home. 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. 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. (3), January Build your own custom newsletter with the content you love from Street Muscle, directly to your inbox, absolutely FREE! (8), June 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. The Detroit Truetrac was the first type limited-slip differential in the industry. When used in a daily driver, these units function well; however, as the miles add up or with aggressive driving or track use, the clutches and other internal components will become worn and severely degrade performance. The Detroit Locker will provide maximum traction because both drive wheels receive 100 percent of the torque. Below are short, not-too-technical, overviews of some of the most frequently asked about differential options for Hot Rods, Muscle Cars, and Muscle Trucks. At lower speeds, once the cornering is done, the differential automatically locks again. Are Your Hot Rod’s Fluids Ready For Summer Cruising? I have a 31 spline eaton posi, and it works great and I love it and its very streetable and handles great. Rather, choosing one of these differentials will be based on how and where you drive most often. Eaton (EAT) Clutch type, similar to Trac-Lok in design, yet far stronger and more aggressive. Higher spring rates will provide a stronger locking function, with lower rates allowing more slip. January When both tires spin, that means the power has exceeded traction, and both tires spin equally because of that power. Follow us: Like on Facebook Follow on Twitter Connect on LinkedIn. This makes for a great all-around differential because there are no wearing parts, and it is completely maintenance free. 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. It made the Traction-Lok from 1968 up, according to the info I've been able to dredge up. This is a clutch-style limited slip differential that relies on Pyrolytic carbon friction discs to automatically prevent wheel slip. The original OEM 12T case was very weak, but the new design replacement from Eaton is very strong. This is beneficial in hard-corner turning. Ford 9" in 28 & 31 spline, Street & Race Aggressive. The Eaton Detroit Truetrac is a helical-gear style performance differential that maximizes wheel traction and enhances driving and handling characteristics. Selecting the right differential for your rearend build is an important decision that will be with you for a very long time - if you get it right. The other tire didn’t seem to do anything more than to support the opposite side of the car. Maintenance-free, it features smooth, automatic operation in forward and reverse. Be sure to check out the Eaton website for more information and availability on either of these differentials. So instead of all the power going to the wheel that slips, much of that power is transferred through the differential to get power to the other wheel. traction lok=limited slip=posi-traction There are a couple different types of rear differentials, open and limited slip. (1), October The Equal-Lok used one large Belleville spring whereas the Traction-Lok used several smaller coil springs. The locking differential will provide power to both wheels. An underpowered car would simply get traction and accelerate. Equa-loc vs. Trac-loc vs. detroit locker. Spins 2 every time. (3), November The markings of a one-tire fryer – a single stripe left on the pavement. Because it relies on torsion, friction modifiers and synthetic gear lube are highly discouraged, as they could prohibit the differentials ability to function properly. 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. Limited slip is the technical name for the differentals that use clutches or other means to drive more than 1 of the drive wheels. Luckily, rebuild kits are widely available so that these units can be restored to like-new performance. Trac-Lok/Posi-Trac – Clutch-type limited-slip (Posi), offered as original equipment in many GM and Ford performance cars, these units rely on clutches (friction plates) to transfer power to the wheels. It will never wear out. 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. The limited slip differential will allow some slipping between the two side gears, this allows both wheels to get equal traction even though one is spinning faster than the other. From full spools and mini-spools for the ultimate in straight-line performance, to full limited slip posi differentials and drop in lockers, PowerTrax provides extreme traction … The limited slip differential is one way to get that lost traction to the wheel that had the most grip. So there isn’t really any way to tell you that one will be better for you based on what vehicle you own. 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. Eaton Posi. Its versatility makes Detroit Truetrac the ideal traction solution for almost any type of vehicle. 4.6 out of 5 stars 19 ratings | 12 answered questions Price: $310.00 & FREE Shipping: This fits your . Featuring pyrolytic carbon clutches, rebuildable design, net-forged gears for added strength and seamless, automatic operation. The Truetrac performs like an open differential under normal driving conditions and automatically transfers … We’re going to look at four Eaton differentials and provide information about each to help you decide which is the best for your application. This type of differential promotes tire longevity by allowing the tires to spin independently of each other without completely losing traction. In operation, the clutches slip just enough to allow for smooth cornering while engaging with more force as power (torque) is applied, driving both wheels equally. 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 factory traction lock is not a bad diff depending on your intentions but to be honest the trutrac is pretty affordable. Pricing: $325.00 Eaton was the original developer of the posi-traction differential, and today it is still used in many GM vehicles, most notably the Corvette. 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. We had a local guy break an Eaton in his Mustang but it's a 5 speed car with 150-350 shot. 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. Great for the average truck owner, but not for those who really use their trucks off-road. A great choice for an all around street driven vehicle. When power (torque) is applied in either forward or reverse directions, the unit locks both axles together like a spool. 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. 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. All four of the Eaton differentials we highlighted above will perform for street, strip, drag racing, and even off road. Keep good gear lube in the rearend, and you should be able to use this differential for a lifetime. Eaton tru trac hands down. At the heart of the locker are two, spring-loaded forged steel side plates (one per axle) with large square-edged teeth that engage and disengage a matching center spider block. It is possible to leave unequal-length patches on the pavement with a limited slip, because at the point where traction begins to happen, one tire will typically begin to see traction before the other. These units came as an original equipment option in 65-72 12T (12 bolt GM truck), 12P (12 bolt GM passenger), 8.2″ GM pass, 63-79 Cast Iron Corvettes. … The original OEM 12T case was very weak, but the new design replacement from Eaton is very strong. The Detroit Truetrac is a helical-gear style, limited-slip differential that maximizes wheel traction and enhances driving characteristics. Personally, I think I'd choose the Eaton Posi in the rear (didn't Eaton used to call them "Trac-Lok" just like Ford does?)" 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(2). Copyright © 2021 Currie Enterprises, Inc.. All rights reserved. Yes, a professional can setup a trac-loc to live under spirited use, but if you have any pretention toward wailing on that rear-end on the track, with slicks, etc...you might want to seriously look into Detroit locker. Eaton G80 Gov-Loc The Eaton ( eaton.com ) G80, also known as the Gov-Loc is a true automatic locker, not a limited-slip differential. How to Install Ford 8.8 Trac Lok Limited Slip for the #v10bumpside project!PLEASE LIKE, COMMENT & SUBSCRIBE! Painting 11s: with a locking or limited slip differential – and enough power – this is the result when you do a burnout: two, equal-length marks left on the road. Additionally, if the vehicle sits for extended periods, the clutch plates can stick together, causing the unit to chatter and clunk until gear oil works its way in between the clutch plates. Although Mopar is in his blood, he loves any car that looks great and drives even faster. Thus, for GM trucks produced after 1972, the only traction-enhancing option was the Gov-Lock (produced by Eaton). Power transfer goes literally unnoticed by the driver, even in front-wheel drive axles! The patented design of parallel axis planetary helical gears provide a quiet, automatic splitting of torque. 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 stripes). Unlike a traditional clutch-type posi, a Truetrac requires no special oil additive or maintenance. pretty cool. 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 want a little of both worlds and total street driveability and maintenance-free longevity, perhaps the Truetrac is for you. Because the power is transferred from the wheel that spins to the wheel that grips, you don’t typically spin one tire. A friction modifier must be added to the gear oil to help prevent the clutches from moaning or chattering during normal driving. The F-Body guys with Moser 12 Bolts seem to do good with the 800# Eaton Posi, I had one in my 12 Bolt but never used it because I parted the car out. A locking differential will do just that: it locks the gears so that torque is provided to both drive wheels. 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. The interaction of the side plates and spider block teeth creates the signature ratcheting sound of the unit. Both were plate style. Eaton posi units are an option on 12 bolt rear ends. This helps prolong tire life, but it is still a great differential for drag racing where traction is of utmost importance. Eaton (EAT) Clutch type, similar to Trac-Lok in design, yet far stronger and more aggressive. A limited-slip differential will prevent the tire with less traction from separately spinning. (1), February 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. If you are wondering if your posi-trac / limited slip has steel or fiber clutches here is a list of some common units: Ford OEM Trac-loc (fiber clutches) Dodge OEM Trac-loc (steel clutches) GM OEM Gov-lok (steel clutches) Auburn cone style posi (use GM oil GM additive) Eaton Posi (carbon fiber clutches) Dodge Trac-right ( helical style) For hardcore off-road or strip use, the Eaton Detroit Locker or ELocker are good choices; for mild off-road, street, strip, or racing use, the Eaton Posi or Truetrac …
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