Need help w/gear and slick size on a 402 Duster

Thanks Tracy and Fishy68, That is so neat. Takes all the work out of doing formulas. I just click auto, Drive, check the gear, run the throttle to set the mph to 112, adjust the tire diameter to get @5500, and there's my combination. Just change gears for more. That is so nice. Helps give you the big picture.:toothy10:
Looks like it's between a 3.91 and a 4.10 . A 3.55 won't even work. Not sure about the tire size and I've got to consider if I get a little faster. I need to make a complete pass with some slicks and go from there.
I made a graft of the rpm's, to compare the different tire sizes. :burnout: