Bonshee1971
Registered Member
When I put my 4in. rough country lift on my 91 blazer, I found that I had a bad vibration at around 30 mph. I noticed that my pinion angle is a little off from the angle at the transfer case. I have about 10 degrees at the transfer case and about four degrees of pinion angle. This four degrees is the angle that is corrected by the shim that came on my rough country rear springs. Could my vibration be due to the unequal operating angles of the driveline? It smooths out at around 40mph. Also, when shimming the rearend, can I add a shim to the wedge that is already on my springs, or do I need to remove the wedge and recheck the angle to find what shim I need?
