install 6" procomp lift and now i have a vibration from the rear somewhere.....i installed a 1" driveshaft spacer and vibration is still there ...does any one know what it could be.....i also i installed a 2.5 "block on top of the 2.5" block(5" total) that came with the kit...could it be pinion angle?

 

do the blocks have a little bit of a slant to them? if theyre straight square blocks then its probably your angle.

 

yeah they are straight and i was pondering that ......so what degree of slant would i need

 

you need to get a pinion angle tool to see how off and shim as needed. How fast are you going when she starts to vibrate? Like is a loud vibrate?

 

the vibration starts at about 60 kmh and gets worse as speed goes up......its not real loud but you can hear it....kinda sounds like an airplane in a way...i got a angle finder and found that there is a 7 degree difference between drive shaft and pinion and the pinion and output shaft of transfer case are parallel