In my 89 Camaro I have an auto trans and i was wondering if i put all these aftermarket parts on it if it will affect anything or not

Listing the aftermarket parts you would like to put on the tranny would help us out.

i would like to put exhaust, headers, intake, intake manifold, new shafts, injectors etc..

probably not, unless you already have trans problems.

You won't be making enough power to worry about the tranny.

yeah unless your stupid like me and running a 150 shot of juice on a highly built 2.8 you wont have a trans prob, with just them upgrades.