they make super stout 6 speeds, but i would say go with a jerrico st-1200 for the fastest truck. i love standard trannies, i would love to see a build like this, ive been thinking of the same setup, but 2wd 4 link with a 427 with 25 psi or so. go for it, ya, and i figured you meant 30k in upgrades once you have the truck right? depends on how much you can do your self.