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a welded diff is rough. some cases it also depends on how it was welded too. most people just weld the spider gears without taking it out ofthe pumpkin, doing such the heat of the welder can destroy the bearings and just cause the diff to crap out.
For second hand experience, I had a friend who ran a welded daily and they guy who did it for him just left it in the pumpkin and went to town with the welder, it immediately whined like no other, and made noises like rocks were being thrown around in the back. about 6 months later, the spider gears just detonated.
The loud clunk could just be the force of the welded trying to turn the wheels over when under load.
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