Spring, rear, extra capacity

Years 1983–87, 1990 Models 2 Factory citations 6

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Also described as Springs, rear, heavy duty

Also documented for Chevrolet

Documented applications

Sierra — Square body (1983–1991)

1983–1987 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; 1983 from the GVWR chart

GM Heritage factory kit — 1983 Chevrolet Truck, p.20.
GM Heritage factory kit — 1984 Chevrolet Truck, p.47.
GM Heritage factory kit — 1985 Chevrolet Truck, p.45.
GM Heritage factory kit — 1986 Chevrolet Truck, p.156.
GM Heritage factory kit — 1987 Chevrolet Truck, p.60.

Sonoma — first generation (1982–1993)

1990 Factory-verified

shared S-series code; cited from the joint S-10/S-15 pages of the S-10 kits

GM Heritage factory kit — 1990 Chevrolet S 10, p.13.

This page aggregates every documented appearance of G51 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.