MBHD, you have some very good points. I had a car with a switch/pitch trans. Put a switch on the dash to change the pitch. A lot of fun, could lay rubber for a city block easy. To do that now would be a lot of work. I would have to get a BOP TH400 and put the parts to make it work in a Chevy case. Not to mention the shortened driveshaft, and the power loss through the trans. I did not know that the aftermarket 2.74 first gear was so weak, thanks for the info. I do know how much they cost, a lot. I have thought about a 200-4R, don't know if I want to change rear gears or not. Another possibility is a TH 200 or TH200c, you get the same first three gears as the 200-4R, also a bolt in. I know that t he car would be quicker with 3.73 gears, just not sure I want to go that route. Do you or anyone else know how much Hp it takes to run different auto trans? How much more does a TH 400 "cost" to run compared to. 350 or 200 or 200-4R? Jay6155