What is it and when do you need it?

 

http://www.novak-adapt.com/catalog/2.../kit_231xs.htm

 

I'm posting bc I'm unsure too. Don't you need a new rear drive shaft after this?

 

I thought it was a new front drive shaft.

 

you use a front shaft in the rear... (modded)

 

You only need it if you get vibes after a lift. mine is a 92 with 6.5" of lift. I have no vibes and no sye. However I do have a tcase drop and a shimmed rear axle. however the 1996+ xjs are more prone to vibes and may need a sye starting out with about 4" of lift.

 

It's not just for vibes.

 

use the search button guys theres countless numbers of threads about this

 

x2