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you dont. you go buy a locking diff.

Or... You pull the cover and drain all fluid. Clean out ALL residual fluid with carb clean. Repeatedly. Pre heat with torch. Weld spider gears to side gears first. Start as deep as you can so you leave room for multiple passes. Make sure you have good penetration. Alternate sides often. Then inner gears to carrier, same rules apply. Do not quench. The longer it cools the better. Install cover, add fluid, go 'wheeling. Do not drive on the street ever again, because this is the redneck way to do it. I am not a welder, or even a mechanic. But it worked for me.

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Q: How do you weld an 88 jeep xj rear differential to make a locker?
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