Overview
The Alloy USA 12129 is a Dana 30 standard front axle kit made from 4340 chromoly, for the 1972–1983 Jeep CJ5, the 1976–1983 CJ7 and the 1981 Jeep Scrambler.
The shafts are heat-treated twice and designed to be up to 40% stronger. The axle has 30 splines and no differential is included. The axle shafts carry a 10-year warranty, and the U-joints carry a 3-year warranty.
Key features
- 4340 chromoly construction
- Heat-treated twice for strength
- Dana 30 standard front axle type
- 30 spline axle
Choosing and fitting an axle
A Dana 30 front axle on a CJ carries the steering knuckles and wheel hubs, so the shafts and joints see constant load from the wheels. Upgrading to chromoly shafts helps with strength, but the gear ratio, differential and locking hubs decide how the axle performs off road. Plan the differential and gearing before the kit goes in, since they control the final drive.
Because no differential comes with this kit, the gears and carrier must be sourced separately and matched to the axle’s spline count and ratio. Inspect U-joints, seals and the spindle bearings at each oil change, and watch for grease leaks or clicking on turns. Worn joints are often replaced together with the axle, so check them while the axle is out.
Specifications
| Brand | Alloy USA |
|---|---|
| Part number | 12129 |
| Axle maker | Dana |
| Axle location | Front |
| Axle type | Dana 30 Standard |
| Axle spline | 30 splines |
| Differential | None included |
| Material | 4340 chromoly |
| Warranty | 10 years on axle shafts, 3 years on U-joints |
Vehicle fitment
The kit fits the 1972–1983 Jeep CJ5 in Base, Golden Eagle, Laredo, Limited and Renegade trim, the 1976–1983 Jeep CJ7 in Base, Golden Eagle, Golden Hawk, Laredo, Limited and Renegade trim, and the 1981 Jeep Scrambler in Base trim.
The list does not include any Wrangler.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
A differential is not included, so one needs to come from elsewhere to complete the axle.
What’s included
The Dana 30 standard front axle kit has 30 splines and does not include a differential.
Not included: A differential.
