alright, let me come in and clear things up. i've welded 6 differentials for people (mig weld, gas) and have never taken them out of the pumpkin. i've just brake cleaned and wire brushed them, dried it all out, heated then welded. NEVER have i had one break and it's a lot easier in the diff. your welder isnt' really sufficient to weld a differential though, that's a pretty small welder, i would only feel comfortable doing it with a 220V welder.
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