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The last service on the automatic transmission was done years ago by a shop that obviously crossed threaded or over-torqued the bolt. I did a drain and fill and the bolt was difficult to remove and replace - it never stopped turning upon replacing it. I managed to secure it enough to where it appears not to leak, but it will need to be replaced at the next service interval. My question is whether the drain bolt is made to strip out before the pan threads are damaged? I don't know if just replacing the bolt will be sufficient; if the pan threads are damaged, it will need to be helicoiled or replaced by a used unit. I have no way to determine the damage until I service it again, but would like to be prepared. Is the bolt softer metal than the pan?
 
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