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Just put my lift on my 1994 GC. The rear lower arms are adjustable but the uppers are not! The pinion angle looks a little low. And it has bad vibes at 30 mph. I move the lowers out 3/4" from stock what should I do now???? Need to fix problem with angle of pinion. It has 5" of lift.
 

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With a non-cv type rear driveshaft, the angle of the driveline at the t-case needs to match the angle of the driveline at the pinion. By rolling the pinion up, you can create vibrations.

With a cv type rear shaft, the pinion needs to be in line with the driveshaft to prevent vibratins.
 

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Wrench Wench
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The lower control arm buckets (at least on the front) should have two nuts on the back. If you loosen those two, you should be able to add and remove shims there to adjust angles.

at 4.5" lift on the front of my Cherokee I have set about 6degrees of castor on it and the driveline and pinion are damn near straight on with eachother.
 
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