pinion angle

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If the car is lowered and the new shaft is 4'' in diameter, you might have a rub problem. Mine is lowered 3/4'' and I had a rub problem with the 4'' shaft. It was rubbing under the rear seat in the tunnel. I just beat a few dents in the tunnel to keep it from rubbing. The latest driveshafts fron JPC Racing are 3-1/2'' inches which avoids the problem all together. I believe the correct pinion angle is -3 degrees. Someone correct me if I'm wrong.