DY hit the nail on the head...

cooler, trans-go kit, servo if ya like a firmer 2-3 shift. If you pull anything at all, you MUST get a cooler...stock ones are decent but not great. Welcome aboard...I build trannys at home (sick hobby) and have great luck with a Cooler and Amsoil Fluids. The shift kit will in fact help your tranny wear longer...GM programs them to a generic feel but the guys at Trans-go have found out how to make improvements to the GM calibrations. Dana at 700R4 & 4L60E Automatic transmissions specialists - ProBuilt customizes these kits for your personal driving style...if you don't race it, he leaves out all the confusing stuff and clearly describes what to do. I'm sure one of our sponsors at Finish Line Transmissions | Performance Transmissions | Torque Converters | Transmission Parts | Transmission Service could do the same for you too...

Good Luck!