The tranny has been slipping for a while now, long before I did the servo. I put it in last summer and it worked a little better. At the end of the drag season it was starting to slip rather much, in all gears It still shifted properly, under low load, you could feel it change gears but it just wasn't able to hold my sbc. And yes the throttle pressure valve was set properly. I'm rebuilding the engine this year and its going to be considerably more potent, I just want to rebuild the tranny before any major failures. Not to mention I will be running a muck higher stall this year also (3200-3600). My question really is, what would be the best rebuild kit for the job. That is to redo the entire transmission, and which parts should be replaced with those of increased strenght.