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2013 68RFE P0750 P0871 technical help needed
At wits end on a 2013 pickup 6.7 with a 68rfe. Have installed a 68rfe Jasper built triple disc converter trans that will only shift from first into somewhere around 3rd, does not respond to the gear selected indicator on the dash (can change to any gear I like, but the trans will only start out in first, then shift up to the whatever gear it uses until it drops back into first). Have installed a Revmax valve body with the same codes and outcome resulting, have tested the wires from the ECU to the solenoid pack, verified power to pin 10 (12v until p0750 sets, then ECU opens the relay in the distribution box, and then no more 12v....) Have checked pin 2 to ECU and pin 14 to ECU and verified continuity and no short to ground on both circuits, checks ok. Jasper tech support recommended replacing ECU, which I did, went through the hassle of EFI live reprogram and guess what, same codes came back. Which leaves the wiring harness-so since I'm in neck deep already, attempted to order the trans wiring harness-and.....not available, national backorder, no estimated availability date. So I wanted to reach out to the forum wisdom. What can cause a P0750 and a P0871 with having checked out what I described? Is Transengineer's wisdom still accessible?
Banks six-gun SL+cooler+exhaust, Airdog 4g, Aero turbine muffler, Amsoil lubrication, Fluidampr balancer, Allison 1000 6 speed automatic, Banks intake w/superscoop, Dynatrac free-spin kit