This is how I did my front and rear. I used electric motor cleaner to clean out the diff cases and gears. Then simply drop the gears back in and fill the case up with JB Weld. Super simple and super strong and I highly doubt the JB Weld will ever fail. The only bad part is that it is permanent......but once you experience a locked diff or diffs off road, you'll never go back to open diffs again anyways.