Engine, diesel, 6.2L V8, heavy duty

Years 1983–89, 1991–93 Models 3 Factory citations 23

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Also documented for Chevrolet

Documented applications

Sierra — Square body (1983–1991)

1983–1988 Factory-verified

shared platform code; cited from the square-body C/K pickup kits; heavy duty emissions version of the 6.2 liter diesel; requires B3J diesel equipment; 1988 from the 1988 engine data page, which names the R/V 20 bonus and crew cab and R/V 30 pickups

GM Heritage factory kit — 1983 Chevrolet Truck, p.15.
GM Heritage factory kit — 1984 Chevrolet Truck, p.23.
GM Heritage factory kit — 1985 Chevrolet Truck, p.23.
GM Heritage factory kit — 1986 Chevrolet Truck, p.22.
GM Heritage factory kit — 1987 Chevrolet Truck, p.39.
GM Heritage factory kit — 1988 Chevrolet Truck, p.50.

Suburban — Square body (1983–1991)

1983–1989, 1991 Single-source

heavy duty emissions 6.2 liter diesel for the 20/2500 series; requires B3J diesel equipment; 1989 from the power team page, which heads its diesel teams with LL4; the 1990 pages print the code as LIA or LLA, so 1990 is left out; shared square-body platform code; cited from the Chevrolet Suburban kit; 1991 rests on the Chevrolet-only 1991 Suburban book, so the row is single-source

GM Heritage factory kit — 1983 Chevrolet Suburban, p.13.
GM Heritage factory kit — 1984 Chevrolet Suburban, p.16.
GM Heritage factory kit — 1985 Chevrolet Suburban, p.16.
GM Heritage factory kit — 1986 Chevrolet Suburban, p.15.
GM Heritage factory kit — 1987 Chevrolet Suburban, p.22.
GM Heritage factory kit — 1988 Chevrolet Suburban, p.15.
GM Heritage factory kit — 1989 Chevrolet Suburban, p.6.
GM Heritage factory kit — 1991 Chevrolet Suburban, p.18.

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

1983, 1984, 1986–1989, 1991–1993 Single-source

379 cu in heavy duty diesel; G30 with C6P; requires B3J on every cited page through 1991; 1990 is left out because the 1990 pages print LLA (p.15) and LIA (p.6); shared G-van platform code; cited from the Chevrolet G-Van kit; 1991–1993 rests on the Chevrolet-only G-Van books, so the row is single-source

GM Heritage factory kit — 1983 Chevrolet Vandura, p.13.
GM Heritage factory kit — 1984 Chevrolet G Van, p.14.
GM Heritage factory kit — 1986 Chevrolet G Van, p.21.
GM Heritage factory kit — 1987 Chevrolet G Van, p.15.
GM Heritage factory kit — 1988 Chevrolet Vandura, p.17.
GM Heritage factory kit — 1989 Chevrolet G Van, p.17.
GM Heritage factory kit — 1991 Chevrolet G Van, p.9.
GM Heritage factory kit — 1992 Chevrolet G Van, p.9.
GM Heritage factory kit — 1993 Chevrolet G Van, p.58.

This page aggregates every documented appearance of LL4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.