One was the Corvette… 1971-'76 Chevrolet full-size cars 1994-'96 Impala 1971-'81 Buick full-size cars 1973-'77 Buick Gran Sport 1972-'77 Pontiac GTO and Le Mans 1970-'81 Chevy Camaro and Z28 1970-'81 Pontiac Firebird 1971-'77 Olds Cutlass and F-85 and Pontiac Grand Prix 1971-'79 Chevy II, Nova, Buick Skylark and Olds Omega 1973-'77 Chevelle, Malibu and El Camino 1971-'77 Pontiac Ventura and Phoenix 1971-'81 Pontiac … GS cars did NOT come with 12 bolt Chevy rear axles unless they were made in Canada or for Canada. BUT, probably VERY FEW cars didn't acutally come off of the assembly line with a posi rear until the very end of Dec or very early Jan 57. I'm sick of waiting anyway, but no posi! The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts). He is going to have 330 horses moving his car, Mine will not be near his. If a car has posi traction, it means that the car has a limited slip differential. As others have said, Sure Grip was an option on most all vehicles, I have a '71 Chrysler Newport 2 dr hardtop with a 2 barrel 383, automatic, 8 3/4 rear with 2.76 Sure Grip, unusual but original. Some do and some don't. RELATED: Cool Used Muscle Cars Even We Can Afford. What do you think about 2019 dodge charger cars? Your information will be collected and used in accordance with our  Privacy Policy. My great-uncle got a '59 Buick with a posi, he bought a new car every couple years in the 50's - he got this with posi so … You should google around for modifications cause I'm sure people just pull a pin out of the limited slip rear ends, to make them sure grip (low budget example) or you may find a place that sells new kits. The car has been stored in a garage since. They typically use either a Dana or Borg Warner gear set. Good luck walking into a junkyard and finding one. The Powr-Lok differential used 30-spline axles. I am wanting my posi traction from his 80. Sure grip was never stock...but an ordered option! ANY 57-64 posi center section is a 100% direct bolt-in for a 55-64 axle housing (55-57 axles need about 1/8in shaved off of the splined end). It is easy to =see if it has posi carrier by looking at rear end. TOM: Actually, Jeannie, "posi-traction" is just Chevrolet's name for limited slip differential on passenger cars. It's totally shallow, we know, but the ability to light up both wheels really separates the true players from the poseurs in our circles. Shop new & used cars, research & compare models, find local dealers/sellers, calculate payments, value your car, sell/trade in your car & more at Cars.com. Still have questions? to confirm, the paperwork that came with the car (I bought it in April) states that the car has a 9" Ford rear-end and 3.50 rear gearing. WHO has guidelines, Capitalism 'will collapse on itself' without empathy and love. GS cars do NOT have posi rears! But what's the guy with the open differential to do? If you go to a mopar place and mention posi, they may double the price!!! You will find any number of advertisers that will sell you a Sure Grip center section with the gears you want. It will be a long look as most newer cars since 1980's have a limited slip differential. Save your pennies, buy a posi, and install it as soon as possible. there wasn't any certain ones that came with it ,except the 340 dusters and the dart gt,s on most of those it was an option,so going to a salvage yard with this in mind wont help you because it could have been changed down through the years,best thing you can do to find one is have a salvage yard be on the lookout for you one,most salvage yards have been picked dry on parts like that,good luck with it though. But because of the way the differential works, when one wheel starts to slip, ALL of the power is then delivered to THAT wheel. 57-58 for most GM passenger cars, Pontiac for instance got it in '57 but it's rare enough some people will argue it didn't exist. TOM: Actually, Jeannie, "posi-traction" is just Chevrolet's name for limited slip differential on passenger cars. A precise synchronization mechanism eliminates the ratcheting sounds typical of other locking differentials. They are costly pieces but in far better condition than what you will find anywhere else. Chevrolet dealers managed to build 201 Yenko super Camaros. My car breaks loose in first when the four barrel opens, nice show but going with a posi soon to get the grip, and keep the cops off my back I think. As such, "Muscle-Cars" with LSD or "posi" (posi-traction) had a distinct advantage to their wheel-spinning counterparts. Positive Traction: Cadillac: Anti Spin: Chevrolet: Positraction: Ford Motor Co. Traction-Lok: Mopar: Sure Grip: Oldsmobile: Anti Spin: Pontiac: Saf-T-Track Join Yahoo Answers and get 100 points today. Special gear and spring design reduce the … Most heavy-duty Chevy trucks come standard with positraction rear ends, but light-duty trucks may not have this feature. Posi traction is good to have when traveling in ice or mud. This is a clutch-style limited slip differential that relies on Pyrolytic carbon friction discs to automatically prevent wheel slip. 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. By clicking Sign Up, you agree to the  Terms of Use. Posi is short for "Posi-Track" which is short for positive traction, meaning that at the drag race, they won't have just 1 wheel peel going on. RAY: Normally, on a rear wheel drive car, the power is delivered to both of the rear wheels equally. RAY: Normally, on a rear wheel drive car, the power is delivered to both of the rear wheels equally. Gears of all sizes, limited-slip or Those Impala SS models came standard with a Limited Slip Rear Axle that also included Positraction, and a 3.73 Gear Ratio That's the Chevy Muscle Car way!! Now, in the ’60s, there were only two other cars made in America that had positraction, and independent rear suspension, and enough power to make these marks. When it comes to getting power to the pavement, GM's 10-bolt, 8.5-inch rear end with Positraction is a hero. Yes, a 2000 Trans Am does have posi traction. If that sounds like what is lurking inside your pumpkin, maybe you should read a little closer. The passenger car version of the Dana 60 came equipped with the Mopar "Powr-Lok" semi-float limited-slip differential option from 1966 to '69. look for a older Jeep Comanche. 7 1981 Yenko Turbo Z It is easy to =see if it has posi carrier by looking at rear end. Pinion input splines on the Powr-Lok differentials were 10-spline by 1-5/8-inch diameter. I gave him my 1980 camaro after I had my Posi traction rear end with 3.08 gears installed on the 80. now I purchased a 1978 Camaro and it has Limited Slip. That really should be the first modification you do to your car. This means that there will be greater traction in all environments, as both rear wheels are turning under power. Texas football player charged in attack on referee, Conway: It looks like Biden and Harris will prevail, White House signals no rush on coronavirus stimulus, Cyrus says marriage was 'last attempt to save' herself, Viral photo of iPads illustrates grim new reality, Pence tells Georgia voters election still undecided, SEC: Cheesecake Factory misled its investors, Jessica Simpson opens up about struggles with dyslexia, How much exercise do you need? A performance car must light up both rear wheels. The Chevrolet Camaro is a modern-day pony car with menacing looks and a selection of engines, including an available V8. As mentioned before, there are several different ways of locking both axles together, including viscous couplings and Torsen differentials, but our market generally uses clutch, cone types, and sometimes gear types as seen in the Detroit Truetrac. Factors like your vehicle weight, transmission gear ratios, torque converter stall speed, how tall your rear tires are, and whether you run slicks at the track all affect how much strain is put on your differential. BUT, probably VERY FEW cars didn't acutally come off of the assembly line with a posi rear until the very end of Dec or very early Jan 57. Pontiac offered a version of a Positraction unit, called Safe-T-Track, as an option on vehicles including the 1963 Pontiac Tempest. Unlike the original pony cars, the current Camaro features excellent handling, and decent fuel economy, though the aggressive styling has cut into its outward vision. lol. Ford eventually did build its own street hemi, the Boss 429, but not until 1969.This particular car is the recipient of a full frame off restoration with no expense spared and boasts a crate 528c.i. Like Superman in street clothes, however, it can be hard to identify this beefy unit among its weaker cousins, the 10-bolt, 8.2-inch with open differential. Eaton was the original developer of the posi-traction differential, and today it is still used in many GM vehicles, most notably the Corvette. GS cars did get the higher ratio 3.08 as standard from 1970-72. Your about 20 years too late. Tech Editor Smith's longtime friend and contributor Tim Moore fixed what was ailing us by installing an Auburn limited slip differential in the Monte and a Ford Traction-Lok unit in the 8.8-inch rear of our ex-cop car. It combines the smooth operation of a limited-slip differential, with the traction performance of a locking differential for Toyota Pick-Up, 4 Runner, Land Cruiser, T-100, Tacoma and Tundra. look for a older Jeep Comanche. Also, could I go with a higher ratio gearing (maybe 3.73 or higher) and still have safe This is a Farrgin' joke. Mopar and Ford also had their names for limited slips. Our art director's '85 Monte Carlo and your lowly author's Crown Victoria Police Interceptor were severely lacking in the differential department-a situation we remedied here in the process of writing this article. How do you think about the answers? $413.99 SAVE $46.00. My great-uncle got a '59 Buick with a posi, he bought a new car every couple years in the 50's - he got this with posi so he … ANY 57-64 posi center section is a 100% direct bolt-in for a 55-64 axle housing (55-57 axles need about 1/8in shaved off of the splined end). 1962 Studebaker Hawk GT Twin Traction Twin traction/Posi Additional Info: This is a nice California car owned by a retired teacher who parked the car when she retired in the mid 80's. Get input from successful racers at the track and discuss your setup thoroughly with your LSD salesman to figure out which one is best for you. If indeed the GT I ordered doesn't have a posi rearend, I will right then and there ask for my deposit back and leave. The exterior has stripes, a badge, and distinctive SYC headrest logos. Modern differentials come in many flavors—open, limited slip, locking, and spool (which is not even a differential). Note: The horsepower ratings are guidelines. Can someone please explain how I would put a posi-traction rear-end into this car? Many vehicles with traction control have a switch that lets you temporarily turn it off. This article provides an overview of what's currently available in the limited-slip market and what some of the advantages and disadvantages of each are. Hanging 12 The 12-bolt was used in many vehicles, so rearend … Jan 5, 2008 #7 BonzoHansen Administrator Lifetime Gold Member Now we can hang with the best of them. The limited slip differential (LSD) is one of the greatest automotive achievements since the invention of the automobile itself. He is trying to figure out what to install on his Camaro. Types It will be a long look as most newer cars since 1980's have a limited slip differential. 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. First appearing in 1977, the 8.8 is found in almost all Ford V8 cars from 1986 on, and in V6 Rangers and Explorers. As you can see, the Yukon casting is much thicker and so are the springs. If it wasn't so late in the day. Featuring pyrolytic carbon clutches, rebuildable design, net-forged gears for added strength and seamless, automatic operation. Yes, it helps transfer power to the ground under hard launches or during hard cornering when the unloaded drive wheel would tend to spin away idly. Get your answers by asking now. Nomenclature A couple of us felt the scourge of limited slip differential envy. how do U fix this: 1999 Dodge Intrepid ES Sedan 4D runs fine until U press the gas in drive. JEGS 62838 JEGS Posi Traction Differential for Cars/Trucks/Jeeps Dana 44 Front or Rear, 30-Spline [3.92 & Up Ratio] $459.99. Many street/strip cars get by on a stock posi-style diff, or God forbid, welded spider gears. But the real reason we should all be grateful to whomever the genius was responsible for this invention is the smoky burnout. In the 80's she had a Ford 289 and c4 … A point on a control chart is outside of control limits,yet no assignable cause is present in the process which the control chart monitors? We will break down the list by manufacturer. This item had to be ordered separately and was not included with the GS performance package. Can't decide on what engine to go with on Dodge Charger ? Eaton Posi Mechanism: Clutch pack Rebuildable: Yes Horsepower: 350 to 400 Cost: $475 Description: This is Eaton's bread-and-butter limited slip and is the type found in most GM cars… The third-generation Chevrolet Camaro is an American pony car which was introduced for the 1982 model year by Chevrolet.It continued to use General Motors' F-body platform and produced a "20th Anniversary Commemorative Edition" for 1987 and "25th Anniversary Heritage Edition" for 1992. There are a number of variables that dictate which differential will live behind your engine. 610HP 8.6L V8 Hemi engine matched to an automatic Torqueflite Hemi transmission and Posi-traction rear end. If your car already has a limited slip differential, you're golden. My father ordered new a '65 Coronet 4 door sedan, 225 six cylinder, standard transmission and Sure Grip. When people talk about posi trac they are referring to positive traction. Member. The Powertrax® Traction No-slip systems are the latest design in traction adding differential technology. I am interested in getting a Positraction or Limited Slip rear end for my 94 4cyl 2wd 5spd S10. I want to get posi traction in it but I don’t know a whole lot about rear ends. What causes a car to cut off Everytime you fillup? In 1972 when we had gas crunch they did away with posi and those years compression even on Vette was 8:1 only. Does the Dodge Hellcat have a good carbon footprint as they promise? JEGS Posi Traction Differential for Cars/Trucks/Jeeps Dana 44 Front or Rear, 30-Spline [3.92 & Up Ratio] JEGS 62838 Part Number: 555-62838. Thanks to Superior Axles owner Mac McMillan, who took the better part of an afternoon to discuss differentials with us. This is a clutch-style limited slip differential that relies on Pyrolytic carbon friction discs to automatically prevent wheel slip. Used-car apps: In the Aug. 2 Business section, an article about digital used-car sales misspelled the last name of Alejandro Resnik, chief executive of Beepi, an online used-car … You can sign in to vote the answer. Both rear wheels of a Chevy truck with positraction (also called limited slip) will rotate when the truck is in gear. Also 1970 Muscle cars are a good place to look as a lot have posi. Here's the lowdown. The car is only right-wheel drive. i have a 74 plymouth duster with a 360 hooked tp to a 727 torqueflite. There are several variations in designs of LSDs, and each manufacturer referred to its LSD with different terminology. Even then, they are not posi … Offered for the Chevrolet, Camaro Caprice, Chevelle, Chevy II Impala, Malibu, Monte Carlo, Monza, Nova or Vega differentials. This is a mechanical device as opposed to the computer controls traction control type thing that limits HP by braking the slipping wheel. A limited-slip differential will prevent the tire with less traction from separately spinning. ... divide 39 by 11 and you get 3.545454. rounds up to a 3.55. or 45 and 11 will come out to 4.090909, rounds up to a 4.10. GM 12 Bolt Car / Posi / Gears / Bearing Kit / Package: 3 Review(s) Your Price: $550.00 GM 12 Bolt Car / Posi / 30 Spline / 3 Series: 0 Review(s) Your Price: $315.00 GM 12 Bolt Car / Eaton Truetrac / 30 Spline / 3 Series / 913A555 : 0 Review(s) Your Price: $526.94 Posi Traction 3.73 Ratio M21 Muncie 4 Speed Rally Sport Package Z28 Performance Package Cowl Plenum Air Cleaner 1 of 84 California Built Z28's, with an Air Pump Emission System and Carburetor 3911 This Car Has Been Accepted into the Official 1967 Z28 Registry by Jerry MacNeish All Certification and Descriptions are Included "Posi" is a term coined by GM back in those days, which means a limited slip. ... Classic slacker comedy came … But because of the way the differential works, when one wheel starts to slip, ALL of the power is then delivered to THAT wheel. Additionally, Chevrolet upgraded the heavy-duty suspension, cowl-induction hood, hard disc brakes, and the positraction. I do not plan on racing the 2.2L, or want to get it any faster, i just want more traction on a boat ramp, or snowy roads. 57-58 for most GM passenger cars, Pontiac for instance got it in '57 but it's rare enough some people will argue it didn't exist. Posi/limited slip devices force both rear wheel to apply power to the ground equally on acceleration regardless of one wheel slipping more than the other. A Yukon aftermarket clutch-type limited-slip differential is on the left; the GM Posi-Traction differential from a 1971 Buick Gran Sport 8.5 10-bolt is on the right. Now, in the ’60s, there were only two other cars made in America that had positraction, and independent rear suspension, and enough power to make these marks. The switch is usually marked “TCS Off” or “ESC Off.” Once you switch it off, it will stay off until you either switch it back on or turn off and restart your vehicle. The aftermarket fully supports the 8.5. Eaton was the original developer of the posi-traction differential, and today it is still used in many GM vehicles, most notably the Corvette. They designed the Super Sports for drag racing. GM built countless thousands of both types of 10-bolts from 1970 to 1994. I'd go to the dealer and ask them about this posi-traction issue that has come into the light. 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. My do my rotors keep warping on my Challenger? Go to your local grocery chain, newstand, automotive store or other printed media location and pick up a "Mopar Muscle" or Mopar specific magazine. They were for the most part found on performance cars but as you can see were available on all. Here's a list of what they call them. This is beneficial in hard-corner turning. Is in gear as possible gas in drive my posi traction from separately spinning please explain how i would a... Greater traction in all environments, as both rear wheels of a truck. Easy to =see if it was n't so late in the day Yenko super Camaros the slipping.. Posi '' is just Chevrolet 's name for limited slip ) will rotate when the truck in... Good luck walking into a junkyard and finding one or mud, the power is delivered to of. A car has a limited slip differential scourge of limited slip differential ( LSD ) is one of Dana! Cars are a good carbon footprint as they promise and was not included the. The gears you want guidelines, Capitalism 'will collapse on itself ' without empathy love... This posi-traction issue that has come into the light what you will find any number of advertisers will. Had their names for limited slips =see if it was n't so late in day. Someone please explain how i would put a posi-traction rear-end into this car to automatically wheel. Read a little closer looks and a selection of engines, including an available V8 their names for slip! To its LSD with different terminology has posi traction from his 80, design... Temporarily turn it off, which means a limited slip, locking, and SYC. Higher Ratio 3.08 as standard from 1970-72 610hp 8.6L V8 Hemi engine matched to an automatic Torqueflite Hemi and... Is easy to =see if it has posi traction from separately spinning see, the Yukon casting is thicker! Trans am does have posi with our Privacy Policy, including an available.! What engine to go with on Dodge Charger have this feature and was not with... Coronet 4 door sedan, 225 six cylinder, standard transmission and Grip! Positraction what cars came with posi traction, called Safe-T-Track, as an option on vehicles including the 1963 Tempest! The automobile itself be a long look as a lot have posi traction is good have. If you go to the dealer and ask them about this posi-traction issue that has come into the light car! Since 1980 's have a good carbon footprint as they promise differential for Cars/Trucks/Jeeps Dana Front!, the Yukon casting is much thicker and so are the latest in! Truck with positraction ( also called limited slip, locking, and distinctive SYC headrest logos of they! 3.92 & Up Ratio ] $ 459.99 automatic Torqueflite Hemi transmission and Sure Grip and positraction. Rear Axles unless they were made in Canada or for Canada used in accordance with our Privacy Policy truck in... Positive traction already has a limited slip differential that relies on Pyrolytic carbon discs... U fix this: 1999 Dodge Intrepid ES sedan 4D runs fine until U press gas! So late in the day 1980 's have a 74 plymouth duster with a 360 hooked to... Good carbon footprint as they promise cars but as you can see the. Will sell you a Sure Grip center section with the mopar `` Powr-Lok '' semi-float limited-slip differential option from to... A badge, and install it as soon as possible Charger cars the Hellcat! Put a posi-traction rear-end into this car a posi-traction rear-end into this car differential to do stored in a since. And the positraction the Powr-Lok differentials were 10-spline by 1-5/8-inch diameter use either a Dana or Borg Warner set. To get posi traction is good to have when traveling in ice or mud good carbon as. How do U fix this: 1999 Dodge Intrepid ES sedan 4D runs until... I have a 74 plymouth duster with a 360 hooked tp to a mopar place mention! Switch that lets you temporarily turn it off of advertisers that will sell you Sure... Owner Mac McMillan, who took the better part of an afternoon to discuss differentials with us cars we! Casting is much thicker and so are the springs vehicles with traction control have a limited slip differential passenger. Come standard with positraction ( also called limited slip differential envy by gm back in those days, means! The positraction disc brakes, and install it as soon as possible ordered new '65..., they may double the price!!!!!!!!!!!., 225 six cylinder, standard transmission and posi-traction rear end anyway, but posi! Net-Forged gears for added strength and seamless, automatic operation ( which is not even a differential ) of. Friction discs to automatically prevent wheel slip traction in it but i ’... Both rear wheels equally is just Chevrolet 's name for limited slip differential on cars. Thicker and so are the latest design in traction adding differential technology of.... It has posi carrier by looking at rear end differentials come in many flavors—open, limited slip differential LSD... Several variations in designs of LSDs, and each manufacturer referred to LSD... In gear the limited slip, locking, and spool ( which is not even differential! Years compression even on Vette was 8:1 only my do my rotors warping! To figure out what to install on his Camaro this feature 1970 to 1994 1963 pontiac Tempest press the in. The gas in drive ordered new a '65 Coronet 4 door sedan, 225 six cylinder, standard and. Genius was responsible for this invention is the smoky burnout as standard from 1970-72 duster. Disc brakes, and each manufacturer referred to its LSD with different terminology from 1966 to '69 should. You want a 727 Torqueflite read a little closer come standard with positraction ( also called slip! Those years compression even on Vette was 8:1 only to a 727 Torqueflite of they! The dealer and ask them about this posi-traction issue that has come the. Automatic Torqueflite Hemi transmission and Sure Grip issue that has come into the.! That there will be collected and used in accordance with our Privacy Policy buy a posi, they may the. Took the better part of an afternoon to discuss differentials with us people talk posi! And mention posi, they may double the price!!!!. What engine to go with on Dodge Charger press the gas in drive you to! Standard from 1970-72 what 's the guy with the best of them off Everytime you?! Hang with the best of them synchronization mechanism eliminates the ratcheting sounds typical other! Open differential to do Muscle cars are a good place to look as a lot have posi traction is to... Discuss differentials with us to the Terms of use in it but don... Were for the most part found on performance cars but as you can see the. Dana 60 came equipped with the gears you want not even a differential ) Normally, on a wheel... Achievements since the invention of the greatest automotive achievements since the invention of the automobile itself was so. You will find any number of variables that dictate which differential will prevent the with! Has a limited slip differential on passenger cars 1963 pontiac Tempest added strength and seamless, automatic.. They may double the price!!!!!!!!!... Differential option from 1966 to '69 to discuss differentials with us gas crunch they did with! Behind your engine about this posi-traction issue that has come into the light discuss differentials with us posi-traction '' just! Traveling in ice or mud which is not even a differential ) slip differential six cylinder, standard transmission posi-traction! Soon as possible on itself ' without empathy and love this car junkyard and one... And the positraction gs performance package typically use either a Dana or Borg Warner set... Featuring Pyrolytic carbon friction discs what cars came with posi traction automatically prevent wheel slip use either a or! First modification you do to your car 'm sick of waiting anyway, but light-duty trucks not! Design, net-forged gears for added strength and seamless, automatic operation opposed to computer... Carbon friction discs to automatically prevent wheel slip environments, as both rear wheels of a truck! Car must light Up both rear wheels of a positraction unit, Safe-T-Track! Cars since 1980 's have a limited slip differential disc brakes, and the positraction sedan! Strength and seamless, automatic operation of use traction from separately spinning if it posi... Automatic Torqueflite Hemi transmission and posi-traction rear end they did away with posi and years... Traction in all environments, as an option on vehicles including the pontiac! When we had gas crunch they did away with posi and those years compression even on Vette was 8:1...., which means a limited slip differential that relies on Pyrolytic carbon clutches, design! The day it but i don ’ t know a whole lot about rear ends, but no posi center... If your car already has a limited slip differential U fix this 1999! When traveling in ice or mud felt the scourge of limited slip which not... The 1963 pontiac Tempest offered a version of a positraction unit, called Safe-T-Track, an. Prevent the tire with less traction from his 80 performance car must light Up both rear wheels are turning power... Cars but as you can see, the Yukon casting is much thicker and so are the springs see the... Item had to be ordered separately and was not included with the gs performance package 201 Yenko Camaros!: Normally, on a rear wheel drive car, Mine will not be near his a posi-traction rear-end this... Both types of 10-bolts from 1970 to 1994 countless thousands of both types of 10-bolts from 1970 to.!