Do I have to yank my motor becasue of this!!????

[Stang_ROTY]

He has built many drang engines and several tractor pull/mudd bogg type also. He is very reputable and take a lot of pride in his work. We didn't even talk $$ until everything was running and running good. He thinks I overheated my tranny when my cooler cloggedand that heat had to expand somewhere. He didn't say I can't drive it, but we will check again and if it's worse it has to come out. This is really tough for me to swallow b/c I haven't even taken it down the strip and I just passed emissions, plus I have no where to do the work.