Hubs, automatic locking

Years 1986, 1989, 1991 Models 2 Factory citations 3

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Also documented for Chevrolet

Documented applications

Jimmy (full-size) — Square body (1983–1991)

1991 Single-source

the 1986 (XEZ) and 1990 (XGZ) pages print the automatic locking hub line in forms that are not accepted readings, so those years are left out; shared square-body platform code; cited from the Chevrolet Blazer kit; 1991 rests on the Chevrolet-only 1991 Blazer book, so the row is single-source

GM Heritage factory kit — 1991 Chevrolet Blazer, p.15.

Suburban — Square body (1983–1991)

1986, 1989 Factory-verified

only in: K/V models; 1989 from the option weight table; the 1987 and 1988 pages print XBZ and the 1990 and 1991 pages XGZ, so those years are left out; shared square-body platform code; cited from the Chevrolet Suburban kit

GM Heritage factory kit — 1986 Chevrolet Suburban, p.20.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.14.

This page aggregates every documented appearance of X6Z in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.