so i did it right? i took it for a test drive after and the vibration actually seemed worse :/

One thing that might be causing this problem is the alignment.  Did you get it aligned after the lift?  Is the vibration you are feeling somewhat like an alignment beeing bad?  Just a thought.

Your not likely to get vibs from coil spacers.

Vibes will be caused by the following;

- Out of balance tires
- Out of alignment
- Pinion angle of axle

If all 4 tires are balanced correctly and your front end is aligned correctly than you need to start looking at your rear driveshaft.

Shims and tc-drops are simply just a "band-aid" in our opinion. The only real correct fix is to use a SYE with a CV-style driveshaft.

You may also want to check the tire pressure in your tires, as an over-inflated tire can also make it feel like you have vibes.

If you have the NP242 TC the only option for you is a hack-n-tap kit. No heavy duty version is available on the market for the NP242 kit.

What you'll do is cut the shaft on the NP242, drill a hole in the shaft, and than install the SYE kit. It's a fairly easy job and does not require you to tear into the TC like the NP231 does to install a SYE.

Here is the one you'd need.

http://motionoffroad.com/catalog/index.php?main_page=product_info&cPath=14_124&products_id=500

You can use a driveshaft out of the front of an XJ if you want. Heck of a lot cheaper than a new CV style shaft.

I'd also recomend not getting the d-shaft from RE if your buying new. A better quality d-shft can be had for less elsewhere.