Odd noise/vibration

matttahoe53

Active Member
Joined
Nov 13, 2011
Location
Pittsboro
I think I have a drivetrain problem that I can't figure out. I have a 99 Chevy Tahoe 4x4 with autotrac and the problems started after I put on six inch RCD lift.

The problem is I get noise and slight vibration when coasting above 40mph. The noise isn't consistent like a wheel bearing. I also had a problem coasting the truck would lose speed easily, but that was fixed with longer front and rear driveshafts. I also have all new u joints and put in a new hub and cv axle on the drivers side.

This is driving me crazy.
Any suggestions or direction would be great.
 
How are the pinion angles? And how are the angles of the driveshafts at the tcase?
Also not to be a douche but this should be in one of the tech forums.....chit chat is for no tech
 
yeah, you probably need to shim the rear. its a wedge that goes between the axle spring pad and the leaf springs, it changes the the angle angle that the pinion in pointing. you need a straight line between the shaft adn the pinion. otherwise...you get vibrations.
 
Moved for possible better viewing and answers
 
Yeah I wasn't paying attention when I posted, thanks moving it.

If I take a picture of the rear diff tomorrow would could you guys tell if the angle is too severe?
 
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