Not trying to slow the car down any, but if it does not that big of a deal as I bracket race. The backstory is I used to run 29.5x13.5 tires and a 4.56 gear. I always shifted at 6,000 would trap around 6500 or so. I than put 31x14 tires on the car and that brought the trap rpm down to around 6200-6300. I have since went from 440 source heads to Trick Flow 240's. I need new tires last year and I wasn't planning on doing any 1/4 mile racing since alot of stuff around me is headed to the 1/8th mile program. I went back to the 29.5x13.5 tires as they seem to work a little better and I wasn't concerned with rpms since I was only plan on running 1/8th mile. With the Trick Flows I'm making more power so the car is pulling alot better. Been out twice this year and I moved my shift point from 6000 to 6400 to try and bring the trap rpm down, but it's right around 6600. Engine is a .040 10.9:1 440, stock stroke, eagle rods, MP .557 cam, Victor Intake, 850 Proform Carb, 727 with 8" 5000 stall, Dana 60 4.56s, 3200lb with driver race weight. Went a 10.57 @ 125 this weekend. I suspect with the projected weather forecast and hot weather coming I'll loose 1-200 rpm going thru the traps due to the weather for the summer months. Prob will go back to a 31" tire next time, but don't really want to replace a new pair of slicks was just looking for ways around that at the moment.