It works quite well in the performance world. It does have a pre-load, so under light traction situations you can get a tire to chirp or drag as you go into a corner, but it doesn’t cause any rear deviation to the chassis. – Creager “The posi is almost exclusively for use in rear axles, and allows someone to have a near-stock open differential driving characteristic. The Posi transfers a certain amount of torque over to the wheel that has more traction.
Dana 35 spartan locker drag install#
As with any plate-style linited-slip-device you have to run a friction modifier, which helps to alleviate a big concern a lot of people notice–the squeaks and squawks–with a posi when they have failed to install a friction modifier.” “The performance posi that we sell on the aftermarket uses pyrolitic carbon coating, which is an extremely durable material derived from materials used for aircraft brakes. Along with that, we’ve also got our own friction material. Over the years we have upgraded it (different types of gears and different kinds of materials) and now it’s a 100-percent net forged gear profile on the unit. On the EATON Posi, it’s about two-and-half times biased toward the the wheel with more traction. “The Posi transfers a certain amount of torque over to the wheel that has more traction. We speak in terms of bias as far as its ability to multiply torque from one wheel to the other.” 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. That diff has changed a lot over the years.
“Its first application was GM half-ton trucks. “Next EATON came out with its Posi, originally the GM posi-traction differential which came out in 1951,” Creager explained.
The EATON Posi was available as early as 1951 in Chevy half-ton trucks. Its designed to keep both wheels in drive mode–even if one is lifted off the ground–and it works in forward or reverse. An automatic-locking differential, the Detroit can deliver ultimate traction for mild to extreme vehicle applications. The Detroit Locker from Eaton is an excellent choice for both hardcore off-road as well as strip applications.ĮATON’s oldest and quite possibly best known automotive performance differential is the Detroit Locker. To help us dig in and get some traction on the subject, we talked to Craig Creager at EATON. Each is a different design, operates differently, and have some application overlaps and specialties.
All can help your vehicle increase its traction capabilities. It manufactures four basic types of differentials for the automotive performance aftermarket: the Detroit Locker, EATON Posi, Detroit Trutrac, and the EATON ELocker. We decided to go to EATON for the low down on differentials. But what is the difference? There are big differences in the way they perform, how they work, and in what sort of driving conditions they are best used in. More than one of them calls out a limited-slip-device as a locker in the rear axle of the vehicle they’re selling. Locker, Posi, limited slip they are all the same, right? You might think so if you buy into the literature put out by some OE vehicle manufacturers.