05 dodge 3500 dully up grades?

[gts_1981]

I have 05 dodge 3500 dully with the trinity on perfomance,extream pp on extream,airrad intake, magnaflow 5in turbo back
so far im happy except with the power puck whem it is on the 90hp setting sometimes it keeps going after i take my foot off the pedel
but my question is what else do i need to prevent premature failer

[mikel]

I'd beef up that tranny asap.