Man this Tranney has been a Can Of Worms

God only knows whats wrong with it if they already got the front pump wrong

Who was the rebuilder???

And I agree its got to be the tourque converter I mean thats the part that allows the engine to idel when trucks at a stop

IDK about the flex plate having a drain hole for the TC
Granted the last TC I changed wasnt on a 6.0 but the TC itself didnt even have a Drain plug

Did you prefill the TC at all B4 you installed it?? I know it sucks to prefill and could take a day to get a quart in it but I always try and prefill them I figure anything is better than dry

will it run if you leave it in park or what????
when does it Bog the engine??
I agree sound like the TC maybe locking up