Overview
The Crown Automotive J8120326 is a rear AMC Model 20 gear set made for Trac-Loc limited-slip differentials. It is an AMC 20 axle gear set for the rear position.
It fits the 1976–1983 CJ-5, the 1976–1986 CJ-7, the 1976–1986 J10 and the 1981–1985 Scrambler.
Key features
- Trac-Loc limited-slip version
- Made for the AMC Model 20 rear axle
- Model 20 gear set
Setting up a limited-slip gear set
A limited-slip carrier uses clutch packs or Trac-Loc style internals to share torque between the axle shafts. When the carrier is opened, the ring and pinion gears should be inspected for pitting, chipping and uneven tooth wear, since a worn gear set can make a noise or cause the axle to lock up unevenly. Gear sets are matched as a pair, so the ring and pinion should be replaced together rather than mixed with old parts.
Setting up a gear set is precise work. Tooth contact pattern, backlash and bearing preload each affect the life of the set, so a careful setup on the bench and in the carrier is needed before the axle goes back together. Replace the carrier bearings and seals when the carrier is open, and use a lubricant made for limited-slip differentials, which often includes a friction modifier.
- Inspect the ring and pinion for tooth wear
- Replace carrier bearings when the carrier is open
- Use limited-slip lubricant
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | J8120326 |
| UPC | 848399066753 |
| Axle type | AMC 20 |
| Position | Rear |
| Differential type | Limited slip, Trac-Loc |
Vehicle fitment
It fits the 1976–1983 Jeep CJ-5, 1976–1986 Jeep CJ-7, 1976–1986 Jeep J10 and 1981–1985 Jeep Scrambler.
The Cherokee, Wagoneer and Wrangler models are not in the list.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Gear sets like this are normally set up by a professional, including gear mesh and bearing preload. Match it to a limited-slip carrier before installation.
What’s included
One gear set, Crown Automotive part number J8120326.
