Automatic... what can be done to them?
 

what are some things that can be done to the GT Automatic to help in performance

The best mod for them as far as performance goes is a high stall torque converter. Also a performance shift kit will make a noticable performace differance, but is a better mod for power handling and durability.

Changing the rear end ratio to 3.73's or lower is a must for optimal performance as well.

Always keep in mind, use the highest quality parts when upgrading the AOD. There are a lot of manufacturers out there, but only the best (usually $$) will net the performance worth spending the money on.

I agree with Unit 5302, but if you really don't want to spend a ton of money on your AOD, go with a C-4. It takes alot less money to make a performance trans. out of them, but keep in mind you will lose your overdrive. As for a stall converter though, big isn't always better. When chosing a converter, keep in mind your cam size, rear gears (I have 3.73's), vehicle weight, HP output. But anyways, don't get too crazy with your converter. I'm using a 2500 stall in my 88 drag car. 60 ft.'s are 1.70's My car has a warmed-over'69 351W, an '80 C-4, and 3.73 rear gears with a spool.

on top of what has been mentioned before... think about installing a lower gear kit into your auto trans... it'll act like a lower rear gear ratio until you go into 3rd or OD, then the trans will have the normal 1:1 drive in third... i've been running that and damn its sweet!!

You can swap it for a 5-Speed, or go with a converter.

Buddy had one on his Roadrunner (big, big stall) apparently he gained 0.5 in the 1320.