AOD Buildup Question

I have an 89 Lx with an Aod. I would like to know what i can/should do to it to get a little more power and performance out of it. I installed a B&M shift kit and it worked great for a month chirping into 2nd gear and you could really feel the shift. Then it went back to shifting like it used to. Does this mean i need new clutch packs? The car is bone stock except for an offroad H pipe but im gonna pull the motor in about a month or so and do a rebuild and id like to do the tranny while its out. This is a daily driver car and only gonna have probably around 350 hp when im done. Any suggestions???