Not sure why I'm such a rock on this; trying to change PCM for larger tires on my truck. Stock size was 31.7" new size is 33.2". I'm using the Speedometer Parameters table. I have a 4.10 axle and if I'm reading the calibration table correctly my '04 truck should have 40 pulses per revolution of the drive shaft. My base tune shows I have 128000 pulses/mile. But that number given the 4.10, and 40 pulses/rev comes out to a 25.8" tire. Like I said above stock tires were 31.7" Goodyears. Any advise on how to make this come out right? Thank you in advance.

Kevin