A: There isn’t any difference. 834 Posts #2 • Aug 28, 2001. Locker Vs. Limited-Slip Which One Is Better? It’s a plate-style clutch limited-slip-differential, and uses pre-load springs to provide initial biasing characteristics of a differential, but it’s not a locker. Theres quite a few forms of lockers. To determine whether your vehicle has a limited-slip or an open differential is one of the easiest driveline checks. Yahoo fait partie de Verizon Media. Find Limited Slip Differentials for Your Vehicle & Fitment. To do that, carbon disc clutch packs, preloaded by a central spring assembly, are located behind each differential side gear. TOM: To correct for that design problem, "limited slip differential" automatically transfers some of the power from the slipping wheel to the other wheel. By using 90’s technology, Yukon has built a stronger, harder working positraction that does not chatter. Most use friction plates, cones and/or gears to reduce slippage between each of the tires. Jerrod Jones Photographer, Writer Courtesy Of Eaton Photographer. “Its first application was GM half-ton trucks. Posi and limited slip mean the same thing, just different names. Posi was the name that caught on and is now the generic name for the limited slip differential. Each does the same, but made for diff useage. The average car has an open differential, allowing a wheel to continue spinning even after it slips. On the contrary, the limited-slip can sense the wheel rotation to absorb power facing the low traction. Open vs Limited-Slip Differentials. I am sure you have heard the term “PosiTraction” used in place of limited slip, that originally was used by … You have the open rear (single wheel pulling) posi/limited slip rear (both wheels, more power is sent to wheel with least amount of traction) Locked rear. These differentials will not divert 100% of the power to one wheel though. Positraction is beneficial when road conditions are wet or muddy. However I have not heard anything good about these at all. See all 6 photos. For a better experience, please enable JavaScript in your browser before proceeding. For those that upgrade to a limited slip diff, most spend somewhere in the range of $600 and $1,200 to get this done, which is not a lot if you think about it. Basically, the inside wheel rotates slower than the outside wheel. posi and limited slip is the same thing. Nos partenaires et nous-mêmes stockerons et/ou utiliserons des informations concernant votre appareil, par l’intermédiaire de cookies et de technologies similaires, afin d’afficher des annonces et des contenus personnalisés, de mesurer les audiences et les contenus, d’obtenir des informations sur les audiences et à des fins de développement de produit. The Popularity of Positraction Units. A limited slip differential, also known as a positraction unit or posi, allows for automatic traction control when navigating difficult road surfaces or weather conditions. Pour autoriser Verizon Media et nos partenaires à traiter vos données personnelles, sélectionnez 'J'accepte' ou 'Gérer les paramètres' pour obtenir plus d’informations et pour gérer vos choix. What is the difference between posi traction and limited slip? The limited-slip differential, with brand names such as Positraction, Sure Grip, Anti-Spin or Safe-T-Track, was an essential weapon in the muscle-car wars of the 1960s. GM has offered Positraction rear ends since 1957, and its 8.875-inch 12-bolt Positraction was most popular in Chevrolet passenger cars from 1965 to 1972. Coming to the battle of Limited Slip vs Posi, what is the state of being more or less? But for those who do a bit of off roading, the ELocker might be best for your application. Découvrez comment nous utilisons vos informations dans notre Politique relative à la vie privée et notre Politique relative aux cookies. Positraction is a type of limited slip. Some power is transmitted through the spider gears to the side gears in the conventional manner. The Eaton Posi limited slip differential (also know as Positraction) prevents wheel slip before it can get started. Insert the remaining parts of the posi-traction upgrade kit into the differential, and bolt all the parts into place. Apply high-quality wheel bearing grease and reinstall the wheel bearings, brakes and wheels according to the manufacturer's instructions. This video shows you how to tell if your rear wheel drive car or truck has a limited slip differential, and also what gears it has. 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. He said there were two types of GM posi's, one with springs and clutches and one with just springs. Swapping an Open Rear Differential into a Positraction / Limited Slip Differential My Camaro has a 3.42:1 open rear differential. Recommended for daily driving, works well in ice, rain, mud and snow. these units have a dual power path from the differential case to the axle shafts. http://www.hotrodders.com/gallery/showgallery.php/ppuser/81494/username/big-gear-head, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. A limited-slip differential (LSD) is a type of differential that allows its two output shafts to rotate at different speeds but limits the maximum difference between the two shafts.. As always, practice safety first and place the vehicle on jack stands. So for me there is a very big identity comparison between Posi and Differential. Ford 7.5″ Ford 8.8″ Ford 9.75″ When one tire would spin it would flip out a little dog that would grab on and effectively lock both tires kind of like a locker. Posi and limited slip mean the same thing, just different names. Performance limited slip positraction units for Street Performance, Hot Rodders, and Off-roaders. When a limited slip diff senses that a wheel is spinning, it will automatically transmit more power to the wheel that has more traction. When torque input increases the clamping load on the clutch packs increases. Limited-Slip 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 car is a 69 chevelle with 4:10 gears. this is a demonstration video on how a non-limited slip rear end and a positive (posi) traction rear end differ. Limited Slips are basically what they say, they limit the amount of slip. A posi will send equal power to both wheels. Profile Page. Drive Type . The Positraction limited-slip differential design offers better vehicle handling and acceleration, and drivers get more forward power because the driven wheel slips less. JohnH, I am not sure if this will answer your question, I think it might. Not all differentials are the same. The first step is to place the vehicle on a flat and level surface, block the front wheels, and raise the rear wheels off the ground with a jack. Technical Positraction vs limited slip? While positraction provides increased safety for vehicle turns and unsafe road conditions, limited slip differential systems are priced at about $600 in 2010. Push the axles back into place, replacing any worn parts during the rebuilding process. So have a look to find the differences. Because of this, limited slip differentials are often referred to as “torque sensing”. I've read lot's about G80 being the GM code for a locking rear diff. In a standard open differential power moves freely to the wheel with the least resistance. Like you have a full spool, mini spool. Just a diff term. Blues4U. I've been looking online since i bought the truck and have been trying to determine if i have a limited slip differential or a possi, also better known as a locker. The only other kind of posi I know about that GM used was the "dog" style which was used in truck 14 bolt rear ends. JavaScript is disabled. While Posi acts as the defender of wheel slip to earlier starts. Hmm, interesting and to think that POSI both tires are always engaged leaving two very dark distinct burn out tire trails, whereby Differential leaves one side real dark the other light depending on which tire grabs first according to road conditions. My 67 chevy has Posi and both tires dig in equally at the track, my other 74 chevy has differential and seems to always "hook" slide to one side depending on which tire digs in but the other tire does not dig in nearly as much as the one that grabs first. 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. Discussion in 'The Hokey Ass Message Board' started by Master Brian, May 1, 2019. However, in situations where absolute lockup is needed, a limited slip is not the best choice due to the fact that limited slips do slip in some situations. Theres 3 types of rears . Pontiac’s was actually called Safe-T-Track, Chevy was Positraction, they are both “limited slip” type rear ends. Page 2 of 3 < Prev 1 2 3 Next > Joined: Oct 1, 2015 Posts: 4,960. So one wheel starts spinning (lets say right wheel), then after the limited slip is engaged (it does it automatically) the other wheel (left) begins to spin at a percentage usually like 70-30. Ford used the name Traction Lock, Chrysler used the name Power Lock for their Spicer limited slip and Sure Grip for their Auburn limited slip. Dana 50. It's almost embarrassing, laying only one streak of rubber. Yukon has developed Dura Grip limited slip differentials for: Chrysler 9.25″ Dana 44. That's why it helps you get off a patch or ice or snow. They work by shifting a portion of the torque to the wheel with the most traction while limiting the slip on the wheel with the least traction. Also, what is the approximate value on a used 12-bolt limited slip rear end, 3.something gears. The 3.42 is good for acceleration without sacrificing too much gas mileage but there is just one little problem with an open rear; the one wheel peel. In an automobile, such limited-slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity. from So Cal. That's just a heavier duty version of "posi-traction," and it operates ONLY on the rear wheels, even if you have four-wheel-drive. Disadvantages of a Limited Slip Differential 1) Lack of Full Power to Wheels Informations sur votre appareil et sur votre connexion Internet, y compris votre adresse IP, Navigation et recherche lors de l’utilisation des sites Web et applications Verizon Media. I think AMC used the name Safety Track for their limited slip. References Offroad.com Overall, the new Dura Grips are superior to the admired and sought after original OEM GM positraction. Limited slip differentials (sometimes referred to as positraction, the name used by General Motors for their versions) are generally used on performance cars to improve handling and grip, and in some pickup trucks and SUVs, to maximize traction on slippery and loose surfaces. Jan 1, 2011. These Positraction Performance Differentials feature a patented carbon friction material designed to endure the hostile extremes of Off Road racing brakes and clutches. There are at least four different types of differentials which are suitable for various kinds of driving conditions. A comparison Between Limited Slip Vs Posi. These are straight line type rears, that dont … Determining Limited-Slip vs. Open Differential. Is posi far superior to limited? Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Mechanical limited slip differentials are arguably the most common type of differential due to their wide range of applications. 70% of power is going to the right wheel, and 30% goes to the left. personal preference, limited slip will send power to the wheel with the most traction. Vous pouvez modifier vos choix à tout moment dans vos paramètres de vie privée. Like the words even, it Differs which tire grabs on differential rear, but with Posi it does not "differ".... :clonk: A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. In this video we compare an Open Differential (Ford Ranger) to a Yukon DuraGrip limited slip differential (Chevy Silverado). Both are useful with distinctions. Detroit Truetrac - Helical-gear limited-slip (worm differential) is the modern replacement for the classic clutch-type posi. Each GM division had its own name for it, and probably a slight variation on the design too. The name “positraction” was used by General Motors for their limited slip differential and the name has been associated with limited slips for many … That diff has changed a lot over the years. Am i right in assuming this correctly..? Member. “Next EATON came out with its Posi, originally the GM posi-traction differential which came out in 1951,” Creager explained. Limited slip differentials (LSD's) come in a variety of designs. Is this true? Thanks. Limited slip differentials work well in nearly all vehicles where traction may be occasionally needed. A mechanic who worked on my car said that the 12 bolt limited slip I have does not have clutches. This is a muscle car! Posi is short for positive traction, which is the name GM used for the limited slip Eaton differential they used in their performance cars. A limited slip differential will not be a terribly costly upgrade to make on your vehicle if one is available. If you want a little of both worlds and total street driveability and maintenance-free longevity, perhaps the Truetrac is for you. RAY: On Chevy trucks, limited slip is called "locking differential." 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. Bolt the posi-traction upgrade kit into place. Was positraction, they are both “ limited slip differentials are arguably the most common type of differential to. Wheel though coming to the admired and sought after original OEM GM positraction question, I AMC. Of GM posi 's, one with just springs over the years a variety designs! Dura Grips are superior to the axle shafts inside wheel rotates slower than the outside wheel Grip... 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