Sorry to bring up an old thread,but I've been away for a while.I run a TH400 and my transmission guy told me the same thing about the high gear burnout,so that is what i do. My question is about the guys saying never put one in to neutral.Now,I'm not trying to split hairs here,but after you do a burnout and put the trans into to neutral,i usually rev mine at the prestage light to clean it out. Nothing crazy,just 1 or 2 quick raps to about 4 grand or so. Is this a no-no?
btw-my th400 had 186,000 miles on all original parts when i put a good set of clutches and a reverse pattern valvebody in it.All other parts are still original.I've put alot of passes on this transmission and am very amazed at its reliability.