2003 2500hd rear end shaking/vibration

[Vmyrhaug]

have a vibration/shaking in rear in rear end.
wheels are in balance, tried several wheels.
new brake rotors and pads.
lubricated and checked axel too transfer.

around 50mph and up it has this.
anybody else had this and might know the problem?

 

[TheBac]

Ujoint(s) going bad?

 

[Vmyrhaug]

Ujoint(s) going bad?

cant find any play in them.. could center axel be out of balance?

 

[Vmyrhaug]

is worse with 20x12 rims with 35" tires, but also with 16x10, with new balance wheels.

 

[Bdsankey]

Sure sounds like a bad u-joint, center support bearing, or the driveshaft weight came off.

Get the driveshaft rebuilt (new u-joints & center joint if equipped) and rebalanced, I bet your issue goes away.

 

[Ron Nielson]

Put the rear axle up on jackstands so the tires are off the ground 2" or so. Put it in gear and go to the RPM or speed where you feel the vibration. Someone needs to observe the driveline, tires, and anything for visible signs of vibration. Be careful you don't personally get wrapped up by the driveshaft - it can be very dangerous. If you don't see anything with the tires on, pull the wheels, secure the drums, and go again.

 

[Vmyrhaug]

Sure sounds like a bad u-joint, center support bearing, or the driveshaft weight came off.

Get the driveshaft rebuilt (new u-joints & center joint if equipped) and rebalanced, I bet your issue goes away.

no center bearing on this one, ext cab and 6ft bed..
i have a spare driveshaft in my workshop, i think i test that one...