I have a 2.5" lift front and 3" rear. There is a spacer on the front coils and an add-a-leaf in the rear. I'm getting driveline vibration from the rear which is more noticable under acceleration in 2WD. I did not have this before the lift. U-joints check out. I can only assume that I will need an SYE, but I thought they were only needed for larger lifts?

I towed a boat up north on the weekend and there was no vibration. I'm assuming this is because the load in the rear lowered it reducing the drive shaft angle.

Any thoughts?

Jeep is a 1998 Cherokee Sport 4L other than lift and transmission cooler everything is stock.

 

Hmm..I've heard of this only a few times on lifts this size..everyone I know runs a 3 inch kit with no sye and no problems..

 

You could just do a transfer case drop. It would be cheaper and easier than a SYE

 

I'll look into the transfer case drop. Cheers!

 

wait a few weeks til the lift settles down and see if you still get vibes

 

Try putting a shim between the spring & axle to change the pinion angle...

 

I had thought about a shim, but my understanding is that the angle into the drive axle should be the same at both ends and shimming one end would cause the axle to twist (different vibration and hard on U-joint). Lowering the transfer case will keep both angles the same, so I think I will go that route after the setup settles as suggested.

 

you can build your own t-case drop by using 1" sq tubing and longer bolts.

this should take care of the prob.

on my dd, I have 4" and only a t-case drop.

 

I have 3" lift with 31" and no vibes

 

I have a 2 " and have the vibes. I just put it in and have driven it for 4-5 days and the vibes seam to be going away.

 

BTOMMY have you noticed the lift settling in? Is yours an add-a-leaf in the rear? Could it be more in the rear? What rear axle do you have?

 

it seems that most people tend to agree that certain XJs are more likely to experience this

-1996+ XJ's (they have the new transfer cases with the longer yet less supported yoke... the boys at Jeep may have been smoking on something good when they thought up this POS)

-higher mileage Jeeps

-XJs with 4x4

-XJs with auto transmissions

-XJs with higher mileage

you sir have most if not all of these

most common fix is to let it vibe for a little while... it might just work itself out...

if not you should try to shim the axle to rotate the pinion upward...

if that dos not work I would then consider a tcase drop or a slip yoke eliminator kit (IRO has them with drive shaft and drill bit/tap for around $250)

 

Correct on all but the high mileage (only 78000km's). Letting it work itself out sounds like bad news for seals and U-joints. I'll post back with what I do to resolve this.

 

Thats the HnT right? Thats what I'll most likely be going with myself.

 

yes it is and good man! How are those... ummm dancers you know doing?