Exploding Torqueflites

i did not think a 904 or a 727 did not bloe up couse of runin it hard i thought they could bloe up only if u NEUTRAL DROPed it i just put a tci 904 in my duster with a 3500 stall behind a built 360 if any one knows if tci trans uses the 6 bolt 16 roller sprag id like to know its not a manule vavle body but will handle 450 hp thanks tom