Overview
The Alloy USA 15103 is a passenger side rear axle shaft for the Ford 8.8, with 31 splines. It fits 1987–1996 Ford Bronco and F-150 models along with E-150, E-250 and 1993–1995 F-150 Lightning applications.
The shaft is made from 1541H or 4140 steel, depending on the application. It is heat-treated and induction hardened to about twice the tensile strength of stock, and up to 35% stronger.
Key features
- Passenger side rear position
- Ford 8.8 axle with 31 splines
- 1541H or 4140 steel, depending on application
- Heat-treated and induction hardened
Bearings and seal replacement
A rear axle shaft works with the bearing and seal at the hub end, so the stock components often come off with it. Because bearings, seals and studs are not included, inspect them when the axle is pulled. Look for play in the bearing, leaking seal oil, or stripped or damaged studs before reinstalling.
Splined shafts wear at the spline fit, so compare the spline count and shaft length with the removed part before fitting. Clean the axle tube and retainer surfaces, and use fresh gasket material where the housing requires it. Retorque hub and bearing fasteners after the first few miles of driving.
- Check bearing play before reinstalling
- Inspect seal lip for wear
- Match spline count to the stock shaft
Specifications
| Brand | Alloy USA |
|---|---|
| Part number | 15103 |
| Axle maker | Ford |
| Axle location | Rear |
| Position | Rear right, passenger side |
| Axle type | Ford 8.8 |
| Axle spline | 31 splines |
| Steel | 1541H or 4140 |
Vehicle fitment
It fits the 1987–1996 Ford Bronco (Custom, Eddie Bauer, XL, XLT, XLT Lariat, XLT Nite, XLT Sport), the 1987–1996 Ford F-150 (Custom, Eddie Bauer, Special, XL, XLT, XLT Lariat), the 1987–1996 Ford E-150 Econoline, the 1989 Ford E-250 Econoline XL and the 1993–1995 Ford F-150 Lightning.
The Bronco and F-150 fit covers 1987–1996, and the Econoline vans and the Lightning are also covered for the Ford 8.8 rear.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Bearings, seals and studs are not included, so they need to come from the stock axle or from elsewhere.
What’s included
One passenger side rear axle shaft.
Not included: Bearings, seals and studs.
