GM / Dodge AAM 11.5 Differential Cover

Built from 3/8" steel to take hits and seal tight — lifetime guaranteed.

This heavy-duty differential cover is built for the AAM 11.5" axle found in GM and Dodge trucks, including the AAM 11.8" variant used from 2013–2018. It's made from a single piece of 3/8" plate steel, bent in eight places for strength, then welded to a matching 3/8" steel ring. Once welded, the mounting surface is machined flat for a precision seal.

A 1" fill plug makes it easy to check or top off gear oil, even on the trail. Whether you're hauling heavy loads or wheeling hard, this cover is built to handle real-world abuse without warping, cracking, or leaking. Each one is made to order and includes the necessary hardware for installation.

Key Features

• Part Number: R1412
• Also fits AAM 11.8" axles (2013–2018)
• Does not fit AAM 12.0" axles (2019+ Ram 3500)
• 3/8" (.375") plate steel construction
• Machined flat sealing surface
• 1" diameter fill plug for easy servicing
• Diff cover bolts included
• Lifetime warranty on differential covers

Fits AAM 11.5" axles:

• GM Duramax: 2001–Current
• Dodge: 2004–Current

What's Included

• (1) Welded differential cover – AAM 11.5"/11.8"
• (1) Fill plug (pre-installed)
• (Bolts) Complete hardware set for installation

Note

Bolt-on installation. Fits AAM 11.5" axles in 2001+ GM and 2004+ Dodge trucks, as well as AAM 11.8" axles from 2013–2018. Does not fit 2019+ Ram 3500s with AAM 12.0" axles. This product is made to order — please allow extra processing time. Lifetime warranty on all differential covers.