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I have used 1.5 degrees to 2.0 degrees on the pinion angle for a lowered 1969 Camaro and it worked for this problem. I had another problem with vibration and hard shifting in reverse that was an alignment issue that was created by the bell housing making the input shaft bind up at the back of the crank. I have heard this is real critical with the Tremec transmission. In fact did you have the vibration before you installed the new trans?
Mark Sheppard