How fast does your dart run? Ever have a problem breaking or twisting output shafts? I have heard of others breaking the outputs...and those shafts in 300M are around $700!
My Dart weighs in at 3160 and has ran 10.06 @ 130.4 so that puts it at around 575 to 600 hp area.I have the 2.77 first gear and 1.57 2nd gear in the trans with a brake. I have had no issues with the output shaft as of yet.( hope i did not jinx myself) lol, I just had the trans apart for a freshin up after 5 seasons and besides the clutch plates being worn down to nothing and all the black gone from the kolene steels it looked good.I figure well over 1000 passes on it in that amount of time.