I have a 98 cherokee. Just got rc 4.5 inch lift. Are Degree shims needed even with the t case drop? I mostly worried about driveline vibes. Plan on doing a slope yoke eliminator eventually but want a bandaid for the time being.

 

I didn't use them.
IIRC the stock driveshaft needs to have the pinon parallel with the tcase output.

 

Your ran the same setup and were fine? Should I buy the shims just to play it safe ?

 

I did the tcase drop.

 

1 no you don't need them but highly recommend 3(degree) for 2-5.5" 6(degree) 5.5+ .
2 Shims are not a bandaid they fix a real problem with lifting solid axle trucks and suvs and can be used permanently
3 tools I recommend for doing lift and sye, top of the line lock ring plyers (sye),
Pickle fork for steering parts and bolts, used it alot, I hope I helped some,
John

 

Vary important as well. Cuts the vibs down a lot

 

The bandaid is the tcase drop the shims are for a serious think like everyones said. If you don't understand standard the angle thing I can take a picture for you.

 

The standard Driveshaft / Pinion angle geometry link:

http://www.4xshaft.com/driveline101.html

(For reference, you have a "Two Joint Shaft" unless you have an SYE, in which case you have the "C.V. Drive Shaft")

 

I now what your saying about the shims. So 3 degree shims would be a good choice ?

 

No. If you are using the slip yoke driveshaft you want the pinion on the axle side parallel to the transfer case output. Check the link in the above post.

 

I have a 1" tcase drop with 2.5* shims in my 98 with 4.5" and I have no vibrations..works fine for me. Its not the best but for right now it works fine.

Again you need to read the above link as well.

 

Without SYE (Convention Two Joint DriveShaft)

From the image,ideally, you want the centerline of the transfer case/output shaft to be parallel to the differential.
I would start with a transfer case drop then make proper adjustment(with shims) to you pinion angle to get as parallel to the transfer case as possible.

My RC 4.5" lift kit came with a 1.25" transfer case drop kit, so i'm assuming a 1.25" transfer case drop would be a good start.

 

Yeah mine came with one too ill just start with that and see where things go witb vibes and such