I have a turbo400 set up we played with for a little while on the 1000whp car. With the Gear Vendors Overdrive it would only do 135. Did not take it to the track. We put a SpecialtyZ trans in it but have not scrapped the th400 set up yet. Had it re-stalled and it sill feels like it just blows power through the converter. Seat of the pants the th400 even though it was was loosing power through the converter felt the best. The Paddle shift set up we did with the SZ trans is pretty badass though I must admit but we need to add a trans brake to it.