Ujoint vibration resolved....and then

solved my 20 mile an hour bad vibration problem and indeed it was a bad u joint at the diff.It was a mother to take off considering it being seized up in two bearing caps.Took it for a drive and now a new vibration...but this time at 40mph,not as bad with the bad u joint previously,unbalanced tires perhaps?Discount tire says they balanced them but I'm skeptical if they even lug balanced them or not.....`everything is secure on the drive shaft BTW,re checked it after I drove it.

 

center bearing...

 

Did you mark the parts of the driveshaft prior to disassembly to be able to reassemble the same and maintain the balance of the driveline?

 

like landphil says did you mark the drive shaft? if not rotate it 180 degrees....................

 

No, I did not mark it,The only reference I used was on the white label on the shaft, which was facing downward

 

if he replaced the u joint at the diff it doesnt matter.... the only thing that could be flipped 180 would be the lil yoke piece, and that isnt going to cause unbalancing. Now if you did the center u joint and flipped a driveshaft half 180 then yes you will unbalance everything.

 

BTW, the Ujoint it was a tad snug when I put it back on,i'm probably going to have to re-adjusted somehow that might contribute to the vibrations in contrast with the center bearing being another issue