- 1984 Factory-verified
only in: S10603; requires YC3; from the YC3 price lines with YJ4 or YJ5; the 1984 decor page misprints its heading as EXTERIOR DECOR-YJ3 (code line RPO YI$); 1985 prints it only in a not-available remark, so 1985 is not claimed
GM Heritage factory kit — 1984 Chevrolet S 10, p.12.
YJ4 Factory-verified
Documented applications
This page aggregates every documented appearance of YJ4 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.