I am having probs. with my 1-2 sometime not shifting at wot, I have to let off then it will shift.

and 2-3 all the time at wot. have to let off for it to shift also.

I put on a new filter and changed fluid, It didn't help. Im leaning towards a stuck valve body.. how hard is it too clean. the tranny is not very old, and has kevler bands.. and billet servos.. and a stage 2 shift kit. when I put it in it was fine for about a week. then this.. I believe I still had some metal shavings or other gunk in my lines from when the other tranny went out. is it a hard job to do myself. is it just under the pan? is there a write up somewhere where I can go step by step to do it myself? thanks...