Tire, spare, 8.00-16.5/D, highway, nylon, blackwall

Years 1984, 1989 Models 1 Factory citations 2

Also documented for Chevrolet

Documented applications

Vandura and Rally — Second generation G-series (1983–1996)

1984, 1989 Factory-verified

the 1984 pages list it for cutaway and Hi-Cube vans; 1984 from the February 1984 data book pages in the mislabelled G-Van kit file; 1989 from the weight chart, which prints the code on its own line (the merged Chevrolet G-Van doc leaves 1989 out); shared G-van platform code; cited from the Chevrolet G-Van kit

GM Heritage factory kit — 1985 Chevrolet G Van, p.83.
GM Heritage factory kit — 1989 Chevrolet G Van, p.35.

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