You'll have to use a reverse torx socket for the bolts that go into the frame rail. Go easy on removing them. Soak them with some penetrating oil first and you may have to use a long pipe on a breaker bar to break the bolts loose. Also, make sure to check the clearance on your shift levers when you do lower the T-case. When I lowered my 89' yj T-Case 2" the shift lever would hit the metal band around the shift boot when in reverse. This didn't allow reverse gear to fully engage. After about 1 month of driving it this way, I was pulling the tranny to put in a new reverse gear.
89' YJ - 4.2 - NV4500 - NP231w/sye - 1" Body Lift - 2 1/2" Rancho Suspension Lift - 31" Firestone MTR - AR Outlaw II - Tomken Bumpers F & R - Warn 8000 front - Warn 6000 rec. mount rear - FlowFit Seats - Tom Woods Rear & Custom 2" front driveshafts