RE: allison won't downshift
I think that's the problem, I pulled out the ECU, unplugged it and cleaned the connector and reinstalled and now it will down shift. For some reason the way the wiring harness is mounted it's too short and it is almost impossible to get it out of the mouting box (very poor design, I was temped to cut an access hole to be able to reach the back of the ECU). I think this may have caused excessive pressure on the connectors and has damaged one of the pins causing the sometimes faulty connection. I am not sure how to trouble shoot this. I would think I could use on ohm meter and check each pin, but it may not show a bad reading unless its at a certain angle or has pressure on it. Its not too comforting to use the motorhome knowning at any time it could lock me out of gear. I guess I am just getting old, but the electronic eqipment is great when it works and almost worthless when it fails. Our boat has two mechanical 6BT motors that will always run as long as the motor gets fuel. I have seen seveal of our friends with newer electronic motors that will run great one day and outright stop another because of a faulty electronic componet. Again thanks for your help, sounds like you really know the Allison's well.
Wayne