Could you send me a screenshot of where to air check after removing the valve body? That would be the best way to check for a damaged reverse piston correct? Do you usually clean the valve bores like and Allison to unstick valves or just replace the whole valve body? Thank you for the info as I have found there is not much out there on these and my dealership hasn’t seen much either.Couple things I’ve had issues with on these. I’ve had sticking valves in the upper and lower valve body. I’ve also had the check ball get damaged and end up damaging the low reverse piston. The great thing about this trans is that after removing valve body assembly you can air check everything through the bottom of the case really easily.
Hey Mike, is there a way in these transmissions to tell if it’s sticking valves without pulling the valve body apart? It is not throwing any transmission codes.If you have valves that are sticking, you have internal problems. Whatever is sticking those valves came from the inide, not the outside.