sold a transmission now having buyer problems

Quote: I sold the transmission for $120, and told the fella it would move forward and back when it was done if not I would give him his money back.

Technically it went forward and backward. You lived up to your end of the deal. I run a shop and hate putting in used transmissions because 3/4 of them have problems. And I never, never, NEVER put in a used transmission without a new front pump seal, rear seal and pan filter / gasket. I don't want any issues coming back to haunt.

I think the shop putting in your transmission has a share in the blame, so if it is a leak I put it on their shoulders, or the buyer for not checking seals on a used part. If it doesn't shift, you need to give them their money back.