stall and built trans?
 

If i were to install a TT2600 or even TT3000...........should i be worrying about putting an FLT trans in too? i dont know if the stock trans can hold up with a stall or not. other mods in sig.

it all depends on how you drive it. mine is stock with only a servo and a tt3000. it also has 120000 miles on it. no tranny is invincible. doesn't matter who builds it. if you try hard enough you could break any of them. especially a 60e.

You will need at least a shift kit, servos, and a larger cooler at a minimum.....if you want, throw in alluminum acumulator pistons too.