I have a stock 2002 Chevy Silverado 4x4, 2500 HD, 6.0 L - 4L80E.
I did a transfer case swap with an older transfer case (94 ish?), and haven't been able to get the speedometer to work correctly. I have no idea if the transfer case I got had issues, or if it uses a different type of pulse (square wave vs sine wave).
The truck does a decent job of shifting considering it doesn't have a speedometer, so I assume it is getting some information from the front wheel speed sensors. (however it does shift hard)
I hacked into the ABS harness for it and my speedometer read at aprox 1/2 of what it should (maybe 17/40 if I were to guess?). My thought was to change tire size / transmission gear ratios via HPTuners.
I know this isn't proper, but is there anything it is going to hurt? (aside from losing my ABS, and potential troubles with wheelspin).
hptspeedo.JPG
Also is there a better way to do it? They seem to give me quite a few options. - changing the VSS pulses, - VSS output pulses (not sure the difference? - or change both) per mile - rear end ratio - trans rev/mile.
If I "trick" hp tuners into doing it for me, by telling them I change my tire size( and don't scale tables), it maxes out the trans rev/mile and changes the top vss pulses.
I can just play with it and see, however there is a warning I can't fully read and the helpfile doens't duplicate when I hover over vss output/mile, saying not to set this too low as the PCM may .....
Also I thought there may be some things that I hadn't considered? I believe I will still have my passenger side front wheel speed sensor, so I'm thinking it will just think I have a bad drivers side sensor, which is something I figure the truck can handle.
Thanks in advance,