1999 GMC Jimmy Rearend vibration above 50mph

1999 GMC JIMMY
113,000 MILES • 6 CYL • 2WD • AUTOMATIC
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TODDFISHN
  • MEMBER
  • 1 POST
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
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BMRFIXIT
  • ✓ASE Certified Mechanic
  • 19,053 POSTS
  • ASE Certified Mechanic
Also check drive shaft and u joints
Mar 26, 2009 at 8:44 PM
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