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Based on the LA-series 239 cu in (3.9 L) V6, the 3.9 L Magnum featured the same changes and upgrades as the other Magnum engines. The 3.9 L is essentially a 5.2 L V8 with two cylinders removed. Power increased substantially to 180 hp (134 kW) at 4,400 rpm and from 195 to 220 lb⋅ft (264 to 298 N⋅m) at 3,200 rpm, as compared with the previous ...
It was conceived and prototyped as a Magnum 5.9 with two extra cylinders and a longer stroke of 3.88 in (98.6 mm). The first-generation Viper V10 engine had a displacement of 7,990 cc (8.0 L; 487.6 cu in) and produced 400 hp (406 PS; 298 kW) at 4600 rpm and 465 lb⋅ft (630 N⋅m) of torque at 3600 rpm. [2]
The Grand Cherokee ZJ also offered Chrysler's 318 cubic inch (5.2 L) Magnum electronically fuel-injected V8 engine as an option, which produced 220 hp (164 kW) and 280 lb⋅ft (380 N⋅m) of torque for up to 5,000 lbs. of towing capacity, and was the only SUV in its class at the time to offer a V8 engine as an option.
A narrower range of engines was offered: the base power plant was the 225 cu in (3.7 L) slant-6, now with top-fed hydraulic tappets, and the 318 cu in (5.2 L) and 360 cu in (5.9 L) LA-series V8s. The slant-6 was replaced by the 3.9 L (237 cu in) V6 for 1988; in 1992, it and the V8s became Magnum engines.
Powered by the 318 cu in (5.2 L) or 360 cu in (5.9 L) Magnum V8 engine and offered exclusively with rear-wheel drive, it was discontinued after the 2001 model year. One of the features of this generation was a small third-row folding seat in the cargo area that faced sideways, making it less practical for long trips.
These newly revised engines were marketed under the "Magnum" name. A heavy-duty automatic transmission with overdrive called the A518 was offered with the 5.2 L and 5.9 L engines. As part of Chrysler's overhaul of corporate transmission nomenclature, the A500 and A518 were redesignated 42RH and 46RH, respectively, in 1992.
A V6 and two V8 engines were available: The standard engine is a 3.7L PowerTech V6; the two 4.7L V8 engines are the standard PowerTech V8 and the V8 High Output or HO. The 3.7L V6 produces 210 hp (157 kW) and 235 lb⋅ft (319 N⋅m) of torque. The standard-output 4.7L V8 produces 230 hp (172 kW) and 295 lb⋅ft (400 N⋅m) of torque.
The SLT, SLT Plus, and Sport trim levels offered the 3.9 L Magnum V6 engine as standard equipment (late availability starting in 1999), with the 5.2 L and 5.9 L Magnum V8 engines being available options, later switching to the 4.7 L Power-Tech V8 engine, with the 5.9 L Magnum V8 engine optional.