This is a KC valve body that has been modded for Constant Tv pressure By Jakeshoe and his shift plate this valve body automatic shifts at 6,000 rpms or more by itself and shifts real firm I installed this in my car and was having some 2nd gear starts due to high pressures about 50% of the starts would start in 2nd gear other guys have no problems with this setup so maybe I have a stronger pump or other issues I do not know , but I have put my stock valve body back in so this one is for sale $ 200.00 shipped with plate ... ps you will just need new gaskets , more info on this valve body and mod is on Jakes web site