I run a '91 Trooper with 32 X 11.50s Wild Country Mud Terrains. My engine is a GM Performance 3.4 with a Holley TBI and bored manifold.

Rear springs are DOR spring ungrade, DOR skidderz, DOR shackles. In the front I have Sway a Way torsion bars painted DOR yellow, a ball joint flip with DOR spacers.

I also have DOR boulder bars and a custom DOR rear bumper. I have an ARB bullbar on front.

I have a factory LSD which can still be coaxed into working after 200K miles.

While Cliff Hanger is rated a 4.5, I personally considered it the toughest 4.5 in Moab in the sense that it requires the most from the vehicle. Some of the 4.5s require a lot of nerve on the part of the driver, such as White Knuckle Hill. Personally I don't think that it should be run with less than 33s and a locker.