[duplox]

C4 is a 3 speed. bringin the shifter down from the front of the car, the pattern is P - R - N - D - 2 - 1. Mine was built with a reverse manual valve body, so it goes P - R - N - 1 - 2 - 3. Stock, they can take probably in the range of 350ft/lbs. They don't have any real bad weaknesses, just a few usual type things that need to be upgraded. One common problem is snapping the input shaft.. you can get a hardened input shaft for around 100-200 bucks if I remember correctly. Then there is the planetary gear that eats itself up, you can get an aluminum 6 gear planetary(stock is 3 gear iron) for another $150 or so. Then get a rebuild kit with kevlar bands, etc, new performance valve body, torque converter, etc, and you'll be good to around 500ish hp.