Rear end upgrade??

Doesn't hurt to change the rear end fluid anyway, so pop the rear cover off. The gear ratio will be stamped into the ring gear. Also by opening it up you can tell it is has a limited slip unit (suregrip) in it. If the ring gear is a 2.71(or higher) you lucked out. All you need to do is go junkyard, find a 96 or older jeep GC and you can take the sure grip unit and better gears outta it and bolt it into your 8.25 rear. But wait it gets better, if the jeep GC has rear disc brakes you can remove them and bolt them directly to your 8.25 rear.