Tx5spd

Hi Guys , I just bought a 2004 Silverado Rst with a 5-speed an was wondering to what power levels yall might have pushed them to . I know its far from the ideal tranny for going fast but I want to keep it till I can afford a t-56 . I don't plan on adding much but i figure if it can live behind a Supercharged 4.8 maybe it can live behind a cammed 5.3 or 6.0 at least for a little while . Any clutch swaps or mods other than the drill mod ? Any help would be grateful cuz info on these is almost nonexistent !