Well i just installed the RE 4.5 Extreme Duty lift on my YJ, and the 4WD doesnt engage now. I check the vaccum on the front axle and its all hooked up. After i tested the YJ right after the lift was put on, it worked. Now it doesnt engage. Any ideas??

Couple questions:

Is the light coming on?
Is the T-case going in gear and the axle not engaging?
Or is it just the axle not engaging?

did you install any body lift at the same time?

At the same time as your suspension lift...did you do a tcase drop?

The problem was a pinched vaccum hose and had to replace it.

Originally posted by Adam
The problem was a pinched vaccum hose and had to replace it.

Glad you got it fixed . . . thats where I has headed with my questions :D