Here is correct speedo for your setup and high AC signal idle.
5.3stockbackup_0001.tun
Where your speed sender is you don't need the low range switch. The speedo is seeing the final drive shaft rotations the same in low and high range. Also take a look at the way I tuned the speedo and see if you can figure out why I did it that way.
Everything makes sense based on tire size and gear ratio I can see where you got the driveshaft revs per mile the change in Pulse per Mile, the change of the diff ratio to 1.67 has me puzzled.
Do you happen to know if the pin for AC request get a ground or 12v+
For what you are doing we are not worried about torque calculation. If you use the speedo calculator this is the ratio it takes to get the 8000 pulse. I like to leave these numbers as they come out of the calculator just in case the PCM uses any or all for other calculations. That way they all calculate to the same thing not matter which way they are being looked at. I could be wrong but doing it this way I have never had an issue.
Off the top of m head I dont know about the AC request. I'm sure LT1swap would have it listed.
Last thing and I will leave you be :-) do I need to do anything else to the file to disable the transmission controls? I am going to get this flashed and do a quick and dirty wiring job to my chassis to see if this will fire up before I close all the looms up. Thank you so much for your help, I have learned a ton in a short time!
Ill check but I'm pretty sure I got it all.
May be of interest.
http://www.gmupfitter.com/publicat/bull/bull64.pdf
Here is a PTO and Fast Idle document for teh HD trucks. You use the cruise control stalk to adjust idle rpms.
http://www.gmupfitter.com/publicat/bull/bull53.pdf
peace
Hog
1997 rcsb stock L31 longblock, Marine Intake with 28# EV6 injectors, L35 2700 stall TC,Hooker LT's 2.007 60ft