mods in the sig..

new mods are 3.42 10bolt posi over my old 2.77 9bolt posi.
and now a new transmission with extra clutch packs, vette servo, transgo shiftkit, 2400 stall.

how much time will i improve?

Well, Im not 100% sure but going with the 3.42's will help you ALOT. Not to mention a stall will definately improve any lag in 60ft times you had. I suppose on the juice you'll be around mid 12's or so, give or take a little. you may even hit some low low 12s, its really according to how much those 2.77's hurt you...but the 3.42 was a wise choice indeed.

Your biggest ET improvement will come from a better 60'. Those gears should help you do that. You should see a slightly better ET but you will more than likely pick up a few mph on your trap. Both good things.