hello, my apologies for not first stopping into the introduce ourself section but ill get to that soon enough. right now, i need some dodge transmission and PCM expertise. Ive got a customers 1997 ram 1500 that we swapped trannys in due to a failure of the original. Blew a cooler line aaaaannnnnddddd continued to drive it. anyway! got a rebuilt trans with a stage one shift kit, as per customers request, and i am having issues with the truck shifting into overdrive leaving from a stop. i can watch it physically shift into overdrive from first on my live data scanner. governor pressure and duty cycle are all where they need to be. HERES THE DEAL! i had issues with the OSS reading crazy speeds so we took care of it and got it back to where it needs to be. however the vehicle even when stopped, will read a vehicle speed that will jump around from 2-400 mph. i believe this is where my issue is coming from however i dont know where or how to sort it out. there WAS welding done on the truck without the battery disconnected so stray voltage IS a possibility, however we swapped in a known good PCM and had no luck. so the original PCM is not damaged. the OSS wiring and sensor test ok and read properly on the diagnostic scanner. testing the mechanical sensor (on the transfer case which runs off of the plastic pinion gear) the harness to it is sending 5.13 volts on the supply wire and is ALSO sending 3.1-4.9 volts on the signal line with the key on.. not an expert in 3 wire sensors but that seems strange to have voltage coming IN on the signal wire. any ideas would be much appreciated. ive run out of alleys to try to troubleshoot. THANKS!!