I have a 8" ATI treemaster in mine. ATI set it up for my engine but they said I needed a 9". So mine may be to loose.
After the M/T I over tired the car with some 1490's(if it can't spin em it can't shake em ). I now have the GoodYear 33.5(Pro-Stock) tire with 4:29 gears in the rear-end. I have only made 1 run a few weeks ago with them and it rained. But on that run my air shifter did not shift(out of air,not the first time but it was the last time)but I had a 1.04 60' my best with the 1490's 1.06. I have an elec. shift in dragster now and hope to get some better times this weekend.
M/T tires and Co2 shifters just do not work for me.
But maybe we can all help each other on tune ups other info.