Originally Posted by
Taz
Hello David,
Are the ECM & TCM tunes from the same vehicle (i.e. matching tunes) ? Is the wiring harness from that vehicle, or a custom harness, and have you confirmed the pinouts / wiring connects to the components / locations that it should ?
If you need schematics to confirm the wiring continuity I can help with that. Also, some ECM & TCM pairings may have odd speedometer parameters to arrive at a proper signal (i.e. tire diameter of 6 inches, etc.). Looking at the stock, never altered tunes should provide some insight.
Regards,
Taz