I freshened up my Chevelles TH-400 trans and also upgraded with a new Darryl Youngs racing full manual reverse valve body. This v.b. does away with the governer and any automatic features. After I got it in...It shifts ok but nothing like the super neck snapping hard shifts I was expecting. I had previously already added a few of my own tricks like leaving out one of the center support rings so both direct chambers would be pressurized and plugged the hole in the case near the front pump so the trans wouldn't lock up in reverse, extra forward & direct clutches etc. Would some of the hi-po builders out there think maybe my previous trick may not be letting the valve body work correctly? It does have a 4800 8" converter which takes some shift out but still doesn't shift near as well as I was expecting. I just wanted to step and and shut the door and be able to honesty say "That 400 shifts like Hell!".. Any suggestions on what might be wrong?