lcalton-

It sounds as if you've still got the center diff housing still on the center diff. You'll see the silver colored top plate and a set of 4 countersunk screws that are flush with the top of it. Those hold the top plate on. Then you'll see a set of 4 holes with screws recessed down below the top plate. Those are the 4 screws you'll need to remove to get the center diff out to change the spur gear. Anytime you want to make any changes to the center diff those are actually the only 4 screws you'll need to remove to get it out. You won't need to remove any screws from the bottom of the chassis and you won't need to remove the brake pads. You may need to remove throttle/brake linkages but outside of that you shouldn't need to remove anything else. I just had my center diff out last night, so it was still pretty fresh in my mind.

Once you've got the center diff completely removed from the housing then the brake rotors should just simply pull off of the center diff outdrives. They may get hung up a little on the very end of the outdrive but a quick tug and it will pop right off.

-RCT