35 mph WOT power loss

Thanks everyone for all your help. I know it takes me a while to understand what some people are saying and sometimes it may seem as if I'm not listening but I promise I'm trying to listen and understand as fast as I can.

I see why people have professionals do their transmissions and also why people do manual valve bodies... add to the to do list...

I had my 904 done by a shop which the owner races a Duster with a 904.

And I am still going thru what you are going thru !

Have we established if you have a part throttle kick down valve body ? We may be chasing a ghost if not .