The Borg-Warner SR4 Transmission was a standard shift, 4-speed transmission found in 1980 and 1981 Jeep CJs. It is a light duty transmission, and was placed behind the 151 Iron Duke I4, AMC 2.5 I4, and AMC 258 I6 engines.
Due to it being a light-duty transmission, the SR4 currently does not have much aftermarket support or adapter assemblies to mate to different engines.
The SR4 transmission case is 9.25″ long in addition to it’s 6″ long shifter/tailhousing assembly. The transmission is fully synchronized in all gears except reverse and all gears are helical cut.
Contrary to a lot of online information, the SR4 does actually have a drain bolt, but it is located in an awkward spot and is one of the bolts used to hold the shifter assembly on.
Gear Ratios – Inline 4 Engines
Gear Ratios – AMC 258 I6 Engine
Fluid Type and Capacity
|Lubricant||80W-90 GL3 or GL4|
75W-90 GL3 or GL4
|Capacity||1.5 qts (1.4L)|
Transfer Case Compatibility
The SR4 transmission was found attached to the Jeep Dana Spicer Model 300 transfer case.
The transmission bellhousing will mount up to the Chevy V8s. This conversion requires the smaller GM flywheel, mini high torque start, and modifications to the bellhousing. Advanced Adapters offers a bellhousing (P/N 712548) with multiple holes to allow the mating of the SR4, T4, T5, T150, and T176 to GM V8 engines.
Write-ups and Tutorials
To Be Completed