My brother has a 1990 single cab 2wd auto and this weekend we did a stage III HTT turbo, P.O.D. injectors, snow stage II water meth kit, 31X13.5X15R slicks, richmond gear locker, fully bombed pump, and had it taken to rev to 3600. He already has exhaust, and a moded air box but the question we have now is whats next? He wants to beef up his 3 speed auto but hasnt been able to find anyone that does aftermarket parts for it, and he doesnt wasnt to swap to a newer one. He also wants more engine performance, what can he do now???