As others have said. Go get a super cheap dana 30 axle so you can test everything out on. Make sure you have a clamshell style bearing puller, an inch pound torque wrench for rolling torque, a magnetic base dail indicator, a press, housing spreader, a caliper. And lots of patience. Then go to YouTube and search for Differential Ring and Pinion Gear Setup. You'll see a guy in a blue lab coat standing next to a Toyota 3rd memeber. It's by FAR the most informative video. Watch it about 10 times. Then start trying.