Timing Chain – GM (12704385)

Timing Chain transmits drive at a fixed ratio and is matched to its shaft by tooth count and spline. A single tooth difference changes the ratio and surfaces as a speedometer error or a shift complaint.

Replace the Timing Chain when tooth faces show pitting, when a whine rises with road speed, or when there is metal in the fluid. Gears wear as a set, so replacing half of one usually brings the noise back.

For this Timing Chain the reference is 12704385, in our Camshafts & Timing range. Compare it with the number on the part you are replacing rather than with a photograph.

Genuine GM supplied for this Timing Chain, with the engineering number unchanged from the factory reference stamped on the original.