I've got a 67 truck running a 2009 Corvette operating system with a T42 controlling a 4L80. The TCM functions as it should. The only problem I am running into is the speedo in the scanner reads about 4x higher than the truck is actually doing. The harness is from PSI Conversions, and the replicated TOS signal from the TCM is wired to C1 Pin 71 on the PCM. It responds to changes in vehicle speed... Just at a ridiculous level. The problem is its hitting the "speed limiter" and shutting the truck down at about 40-45mph.
I'll post the file in a bit. I'm just trying to see if anybody knows if the RepTOS signal is a true clone of the OSS or not. I'm thinking I may have to manually edit the PCM without the TCM connected to try and fix it, but I'm not sure.
Chris... HALP!!
Edit: Attached file. After thinking about this some more (sparked by thumbing through the GM Service Manual for a Corvette), I think we might be SOL. The Corvette is looking for a VSS signal from a sensor that is mounted after the mechanical adjustment of ratio by the differential. So 1000rpm output on the transmission gets dropped down to 292rpm from a 3.42 rear end. The 17 tooth reluctor would spit out about 83Hz at that trans output speed. An auto with a 40 tooth reluctor on the tailshaft at 1000rpm actual OSS is going to crap out 667Hz. Shit.
Chris, are there any calibration values for the RepTOS in the TCM? The only other option for the truck is to use the Chevy Express operating system in the PCM, but we want to avoid that because it's got a Corvette gas pedal.