This Eaton Posi service kit supplies preload spring and plate hardware used to rebuild and re-tension a clutch-type Eaton Posi limited-slip differential. Swapping the preload springs lets the clutch bias be reset or tuned during a rebuild.
- Type: Eaton Posi preload service kit (springs and plates)
- Fits: clutch-type Eaton Posi limited-slip differentials
- Use: rebuild and clutch-preload tuning
- Gear ratio: fits all ratios
- Sold as: service kit
- Part number: 29590-00S
Axle Fitment
- Service kit for Eaton Posi clutch-type limited-slip units. Verify the Posi model and internal spring/plate configuration before ordering.
FAQ
What does the Eaton 29590-00S service kit include?
It supplies the preload springs and plates used to rebuild and re-tension a clutch-type Eaton Posi limited-slip differential.
What is this kit used for?
It is used during an Eaton Posi rebuild to restore or retune the clutch preload that sets the differential's bias.
Does this kit fit all gear ratios?
Yes. The preload hardware is not ratio-specific and works with all ratios, but confirm it matches your Posi model.
Is this a complete differential?
No. Part 29590-00S is a service kit for an existing Eaton Posi unit, not a complete differential.

