If you're looking for some hardcore rock and trail protection for your axle's pumpkin, you don't need to rip off your stock diff cover for an entirely new one. All you need is a Purple Cranium Spider that you can put on without even draining your diff's fluids.?>
We got a front half spider and a rear full spider for our giant fullsize Cherokee, Matilda, and had them both on in less than 30 minutes. Of course, it wouldn't hurt to crack off that cover and add some fresh gear oil as long as you're under your truck, but it's not necessary for adding a spider to your cover.