I know I dont have a 7.3 anymore but.... I have a BTS auto and when I put the truck in reverse for any other gear the engine will stall. Here is the kicker, only when the trans is warmed up tho. My display says the TC is not locking up, the tranny does not get hot when driving and still shifts fine. Just after the fluid gets to at least 130degrees it will stall the motor when I go to reverse, no other gear is effected and it doesnt doit all the time, maybe 10percent of the time it doesnt doit under these circumstances. Any Ideas??? Thanks.