Jeep J-Series Engines by Year

The Jeep pickup sold as the Gladiator from 1963 was renamed the J-series for 1972 and built until 1988. The J10 was the half-ton; the heavier J20 always came with a V8. Jeep's truck literature stopped quoting horsepower after 1973, so most later years show no rating. The 1963–1971 trucks are on the Gladiator page.

Pick a year to see every engine offered that model year, with its code, rated horsepower and the trims it came in. Each engine links to its full specs.

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1972–1988: 1972 · 1973 · 1974 · 1975 · 1976 · 1977 · 1978 · 1979 · 1980 · 1981 · 1982 · 1983 · 1984 · 1985 · 1986 · 1987 · 1988

1972–1988

The J-series used AMC's 258 six (J10 only) and its 304, 360 and 401 V8s.

1972 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	110 hp net	5000/6000 GVW trucks (light series, J10 predecessor) standard
304 V8 AMC 304	150 hp net	5000/6000 GVW trucks optional (all models except 7000 & 8000 GVW Truck)
360 V8 AMC 360	175 hp net	7000/8000 GVW trucks (J20 predecessor) standard, 5000/6000 GVW optional

1973 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	110 hp net	5000-6000 GVW standard
360 V8 AMC 360	175 hp net	7000-8000 GVW standard, 5000-6000 GVW optional
360 V8 AMC 360 4-bbl	195 hp net	5000-6000 GVW optional only

1974 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard (inferred), NA J20
360 V8 AMC 360	—	J20 standard, J10 optional
401 V8 AMC 401	—	J10/J20 optional

1975 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard (inferred), NA J20
360 V8 AMC 360	—	J20 standard, J10 optional
401 V8 AMC 401	—	J10/J20 optional

1976 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard, NA J20, NA California
360 V8 AMC 360	—	J20 standard, J10 optional, NA California
360 V8 AMC 360 4-bbl	—	J10/J20 optional, Standard in California
401 V8 AMC 401	—	J10/J20 optional

1977 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard, NA J20, NA California
360 V8 AMC 360	—	J20 standard, J10 optional, NA California
360 V8 AMC 360 4-bbl	—	J10/J20 optional, Standard in California
401 V8 AMC 401	—	J10/J20 optional

1978 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard, NA J20
360 V8 AMC 360	—	J20 standard, J10 optional
360 V8 AMC 360 4-bbl	—	J10/J20 optional
401 V8 AMC 401	—	J10/J20 optional

1979 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard, NA J20, NA California
360 V8 AMC 360	—	J20 standard, J10 optional, Only engine in California

1980 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard, NA J20, NA California
360 V8 AMC 360	—	J20 standard, J10 optional, Only engine in California

1981 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard, NA J20
360 V8 AMC 360	—	J20 standard, J10 optional, NA California

1982 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 standard, NA J20
360 V8 AMC 360	—	J20 standard, J10 optional

1983 J-Series engines

Engine	Rated	Offered in
258 inline-six AMC 258	—	J10 (models 25/26) standard, NA J20
360 V8 AMC 360	—	J20 (model 27) standard, J10 optional

1984 J-Series engines

Engine	Rated	Offered in
4.2L / 258 inline-six AMC 258	—	J10 standard, NA J20
5.9L / 360 V8 AMC 360	—	J20 standard, J10 optional

1985 J-Series engines

Engine	Rated	Offered in
4.2L / 258 inline-six AMC 258	—	J10 standard, NA J20
5.9L / 360 V8 AMC 360	—	J20 standard, J10 optional

1986 J-Series engines

Engine	Rated	Offered in
4.2L / 258 inline-six AMC 258	—	J10 standard, NA J20
5.9L / 360 V8 AMC 360	—	J20 standard, J10 optional

1987 J-Series engines

Engine	Rated	Offered in
4.2L / 258 inline-six AMC 258	—	J10 standard, NA J20
5.9L / 360 V8 AMC 360	—	J20 standard, J10 optional

1988 J-Series engines

Engine	Rated	Offered in
4.2L / 258 inline-six AMC 258	—	J10 standard, NA J20
5.9L / 360 V8 AMC 360	—	J20 standard, J10 optional

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