Why does a Positraction rear end work?
Positraction units prevent loss of traction by sending power to both driven wheels. At the same time, each wheel rotates independently when necessary, preventing the non-slipping wheel from losing power. A slipping wheel loses power with the conventional rear end design.
Is Positraction better than 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. A limited-slip differential will prevent the tire with less traction from separately spinning. …
Can a 55-56 rear end be converted to Posi?
THERE IS NO NEED TO REMOVE THE PINION GEAR to convert a 55-56 rear to posi. Also, depending on the ring gear used with a posi unit in a 55-56 case (ESPECIALLY if the ring gear is an original 55-6 ring gear), it MAY be necessary to use a ring gear spacer. The reason is because original 55-56 ring gears are thinner than 57-64 ring gears.
When did the GM Positraction rear end come out?
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. Pontiac offered a version of a Positraction unit, called Safe-T-Track, as an option on vehicles including the 1963 Pontiac Tempest.
How to convert rear end gears to Posi?
Thus, you just have to go with the BEST pattern that can be achieved. Also, with USED gears, this is the ONLY way to get an optimal pattern. Of course, this may (and probably will) require tearing down the rear 2-3-4-5 times, pressing off and on the pinion bearing to change shims until you end up with an acceptable pattern.
When did they start making car rear ends?
They’ve been specializing in automotive rear ends since 1991. Another sizable chunk of their business is from customers who gladly spend up to $1,500, simply because their rear end is working exactly as designed.
What does Positraction mean on a Chevy truck?
Both rear wheels of a Chevy truck with positraction (also called limited slip) will rotate when the truck is in gear. This means that there will be greater traction in all environments, as both rear wheels are turning under power.
How are rear ends of a car rebuilt?
If it does not meet the standards the core is tossed out. After inspection all cores are media blasted to take off all rust and corrosion which brings the case back to a new usable finish:
Where to find rear end ratio on Ford truck?
Ford cars and trucks from 1968 on have an axle code on the Certification Plate, information on this plate can be used to determine if you vehicle is factory equipped with a limited slip positraction rear end – differential. The certification plate can be located on the lock face of the left door edge.
How does a Positraction differential work in a car?
This allows the tire to maintain power through the turn. In a positraction differential, the unit senses which wheel has the greatest traction, when one tire is slipping or stuck, and sends power to that wheel. Power to the other wheel continues until equal control is returned to both tires.