I installed a Colorado rear in my 40 gmc.The pinion is 2 inches to the right of center. 52Carl is right about the 2 different angles causing a serious vibration. Couldn't get the vertical angle to zero. The horizontal angle is pretty good.Vibrated like crazy. I used hose clamps to balance the shaft on the vehicle. Got rid of 95% vibration. Its not right but driveable. Keep checking u-joints.
