I broke 3 A-833 tranny's back in the 1978 to 1982 era when I bracket raced a 340 Dart. It ran a best of 11.90's @ 113 and like I said I broke 3 stock 4-speeds. I was hard on them as the pedal was on the floor when the clutch came out and it stayed on the floor until I lifted after the traps. I loved racing a 4-speed but I am glad my heavy 63 is an auto as I know I would break stock 4-speeds if it had a stick in it. Ron