General Motors 2.8L V6 Engine

The GM 2.8L V6 Engine is an engine in the “GM 60° V6” series of V6 engines designed and developed for FWD and RWD/4X4 applications. Multiple generations and variations of this engine were produced ranging from 2.5L to 3.4L and 102 to 215 HP depending on the variation. This engine can be found in many vehicles such as the Isuzu Troopers, Isuzu Rodeos, Jeep Cherokees, Jeep Comanches and many GM products which include brands such as Chevrolet, Pontiac, GMC, and Oldsmobile. Production began in 1980 and ended in 2005.

The LE2 was the first version of the GM 60° engine. It was produced from 1980 through 1986. The model of engines Jeep used was the LR2, which was a longitudinal truck version produced from 1982 to 1990. This engine uses a cast iron block and cylinder head, hydraulic lifters and over head valves.

The engine used a two-barrel carburetor and produced 115hp and 150 lb-ft of torque. This engine is generally considered reliable but is known as a “dog” to owners of the engine due to it’s low power output.

The LR2 engine was not only used in the Jeep Cherokee and Comanche, but also in a few other small truck vehicles.

  • 1984 – 1986 Jeep Cherokee
  • 1986 Jeep Comanche
  • 1982 – 1986 Chevrolet S-10 / S-10 Blazer
  • 1982 – 1986 GMC S-15 / S-15 Jimmy
YearsHPTQ
1984 – 1986115hp @ 4800 rpm150lb-ft @ 2400 rpm

Common Problems

Crankshaft Bearings

Engines built before 1986 had issues with throwing bearings and rod knock. Engines produced in 1986 and on used a revised design and larger rod bearings to remedy the issue.

Intake Manifold Gaskets

In the early years of the engine, the GM 2.8L had a somewhat common issue with the intake manifold gaskets blowing, causing coolant to leak into the crankcase. This is resolved by replacing the intake manifold. If not caught early, it could do significant damage to the lower end of the engine.

Modification

The GM 2.8L V6 engine in Jeeps are not widely modified. Due to it’s lower power and issues, the engine is often either dealt with or swapped out for a AMC 4.0L or even the AMC 2.5L engines.

Engine Overhaul Guide

Engine Removal Guide

Jeep Engines Guide

Engine Spec Sheet

Engine Fluids

EngineFluid TypeCapacity
AMC 2.5L I4Above 0°F: 10W-30
Below 60°F: 5W-30
4.0 qts
AMC 4.0L I6Above 0°F: 10W-30
Below 32°F: 5W-30
6.0 qts
GM 2.5L I4Above 0°F: 10W-30
Below 0°F: 5W-30
3.0 qts
Renault 2.1Ltbdtbd
VM Motori 2.5Ltbdtbd

Transmission Fluids

TransmissionFluid TypeCapacity
Chrysler A904 3-Speed
Aisin-Warner AW-4 4-Speed
Chrysler 30RH 3-Speed
Borg-Warner T-4 4-Speed ATF Dexron II1.75qts
Aisin-Warner AX4 4-Speed75W-90 GL3 or GL4
10W-30 Motor Oil
2WD: 3.7qts
4WD: 3.5qts
Borg-Warner T-5 5-SpeedATF Dexron II1.75qts
Aisin-Warner AX5 5-Speed75W-90 GL3 or GL4
10W-30 Motor Oil
2WD: 3.7qts
4WD: 3.5qts
Peugeot BA-10/5 5-Speed
Aisin-Warner AX15 5-Speed75W-90 GL3 or GL4
10W-30 Motor Oil
2WD: 3.32qts
4WD: 3.27qts
New Venture Gear NV3550 5-SpeedMopar MT Fluid
SAE 30W Oil
3.3qts

Axle Fluids

AxleFluid TypeCapacity
Dana 3075W-90
75W-140 (towing)
1.26qts
Dana 3575W-90
75W-140 (towing)
1.75qts
Dana 4475W-90
75W-140 (towing)
2.00qts
Chrysler 8.2575W-90
75W-140 (towing)
2.11qts

Transfer Case Fluids

Transfer CaseFluid TypeCapacity
NP207
NP228/229
NP231
NP242

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4.0L

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