alright guys when i put my 6.5 kit on in december i had a driveline vibe at around 75mph. i also installed 4 degree shims when i installed the lift along with a rear cv driveshaft approximately 32 or 33 inchs in length.

now that i have regeared my jeep to 4.56s 2 months ago my vibe starts at 65mph and just gets worse the faster i go. it was suggested that i remove the shims and run the jeep down the highway and see how it does.

how many time can i safely reuse the u-bolts i installed new ones when i did the new lift.

so should i A remove the shims and see how it does, B switch to a 3 degree shim or C try a 6 degree shim??? by the way i am running an 8.25 rear.

 

i should also mention that when i was running the 4 inch kit i had no driveline vibes

and i am also running the RC longarm kit that has a 3/4 inch drop

 

honestly you shouldn't worry about taking them off and putting them on a couple times. If you are doing it more than three times though I would just get a new set and keep it on hand.

 

You want angle to be at or slightly below 0*. So whichever shims will get you to that point. If there's vibes still then I'd wonder about yoke on diff, or bearings maybe..

 

was the driveshaft new? could it possibly be out of balance?

 

brand new shaft brand new 4.56s all bearings etc..... i ordered both a 3 degree shim and 6 degree shim today, im going to try the 3 first and see if its better, if it gets worse then im going to try the 6 degree...