Anybody on here successfully rebuild a 4l60e that can stand up to constantly downshifting and up-shifting while still being able to put it in drive and go when you want to? I don't really want a manual because it is expensive to swap and I don't want to have to worry about shifting unless I am racing. So is it possible? I have done lots of research on shift kits and various torque converters but I am more worried about the transmission blowing up. Can/does anyone build these with the intention of manually shifting and road racing while retaining 4 gears??