Timing Chain – GM (12700436)

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.

Ordering reference for the Timing Chain is part number 12700436, categorised under Camshafts & Timing. Match that number against the component you are removing before you order.

This is GM dealer-sourced stock rather than an equivalent, so the number on the Timing Chain traces straight back to the manufacturer.