In regard to my previous post I went ahead and talked to Steve at TCS. He looked up my old convertter from them and it's a 30 degree high stall, which I take to mean 30 degrees negative fin angle pump. I ordered a similar stall speed 8 inch estimated in the 5000 to 5500 stall, which he stated should be in the neighborhood of a 10 degree positive pump. If I was running a trans brake he would have been in the area of 30 degrees positive, but I have no plans at this time for a trans brake. The converter will also have a mechanical diode sprag, so I shouldn't have any issues even if I spray the engine down the road. I plan to try the taller slicks this friday night, then the converter will probably be installed for a race on the 14th. I will keep you posted on the changes between these combinations, and if all goes well a gear ratio change will happen before the end of the year.