Well if its a race car get a 4500 stall converter then it will always be in the sweet spot lol. After the car launches its never going to be at a low rpm again, so that really doesnt matter. A Lingerfelter book that I bought a long time ago talks alot about the engines' powerband matching the trans, and having a manual trans or 6 speed per say keeps in in a really tight rpm range through the ran where an auto works better with an engine with a broad powerband. He plotted on a graph the rpms through each gear in the quarter mile and from that graph you average out what rpms you are at the longest period of time and that is where you focus everything on, not the peak numbers or the low rpms just going into each gear. Again if my cutlass with an ugle 3.06 first gear and a 2200 rpm stall converter is really never under 5K the whole way down the track and watching that on a HPT graph doesnt have much to it, its a very flat line the whole run and the engine sits within an 1800 rpm powerband almost the whole lenght of the track. It isnt in first gear long and it hooks up very hard, there is no wasted time feather or easing into the throttle, its WFO when the tree drops and hang on!
