I just recently swapped out my jimmy's rearend with used one after trashing the original one. Problem is that above 50mph I get a thumping type vibration that will get worse the faster I drive! Is this possibly a pinion bearing problem? I hope! I forgot to check it when I replaced it because it was 35 degrees outand just wanted to get it in. I pulled the wheels and ran it up to 55mph on jacks and it does the same thing. Help!
Mar 24, 2009 at 9:21 PM
