Join Date: Dec 1999
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Re: \'75 Cherokee drivetrain into \'91 YJ?
the 4 speed SHOULD be a T18, it might NOT be a 6.32:1 first gear though, some of the early 70s Jeep trucks had a 4:1 1st T18 also from what I understand.
also the late 70s cherokees are most commonly wide track in the USA, I assume if you say the axles are narrow that the cherokee does NOT have fender flares, and it isnt a model 17.
the T18 will bolt to a 4.0 L BUT you have to relocate the crank position sensor to the front of the engine, or cut a hole for mounting it in the new bellhousing.
the axles will be 30 spline Dana44s, front should have disk brakes, and the gears Ive seen most in that vintage of FSJ range from 3.08, 3.54.
the 4rth and 5th letters of teh VIN should tell if its a wide track cherokee or narrow, model 17 is wide track, model 16 is narrow track cherokee,15 would be wagoneer, and 18 would be 4 door narrwo track cherokee.
those VIN numbers are fdrom a 1978 factory manual, so it might be different in 75, but the 15-18 should be there in teh VIN somewhere!