Locking Differential Thrust Block – GM (12479073)

Locking Differential Thrust Block is a service part for the engine, transmission or driveline. Because several build codes can share the same external description, the part number is the only dependable match.

Replace the Differential Thrust Block when inspection shows wear, cracking or leakage that the surrounding components cannot explain. Rule out the cheaper causes first.

The Differential Thrust Block in this listing carries part number 12479073 and sits in the Differentials category. The number stamped on the original part is the only reliable cross-reference.

The stock here is genuine GM, and this Differential Thrust Block keeps the original engineering number, which matters once a number has been superseded more than once.