The Eaton Posi is a clutch-type limited-slip differential built with race-bred carbon friction discs in a fully rebuildable housing. Net-forged internal gears add strength, and the clutch preload can be tuned by changing spring packs to dial in the bias for the application. It operates automatically and smoothly. This unit fits the GM 8.2in 3rd-member axle used from 1955 to 1964.
- Type: Clutch-type limited-slip differential
- Axle: GM 8.2in 3rd member
- Ring gear diameter: 8.2in
- Axle shaft diameter: 1.197in
- Spline count: 17
- Gear ratio: 3.90 and numerically lower
- Rebuildable: Yes, serviceable with Eaton Posi service kits
- Part number: 19686-010
Axle Fitment
Fits the GM 8.2in 3rd-member (55-64) rear axle, 17-spline, for 3.90 and numerically lower ratios. Confirm your axle and spline count.
FAQ
Can the Eaton Posi be rebuilt?
Yes. The Posi uses a fully rebuildable clutch pack, and Eaton offers disc, shim, and preload spring service kits to refresh or retune it.
What is the difference between a Posi and a Truetrac?
The Posi is a clutch-type limited-slip that can be rebuilt and tuned with spring packs, while the Truetrac is a gear-driven limited-slip with no clutches. Both operate automatically.
Which axle does 19686-010 fit?
It fits the GM 8.2in 3rd-member axle, 17-spline, used from 1955 to 1964. Confirm your axle and spline count before ordering.
