Gary, after seeing this thread I decided to see how my ten wheelers would run with my Odyssey Mogul. I think I gained some insight on on the new Mogul.
I have both Odyssey and Legacy ten wheelers. Also Odyssey and Legacy L2a Mohawks. I can run my Mohawks together and Ten Wheelers together by putting the Legacy engines in TMCC mode.
The Mogul will not run with any of the Ten Wheelers, Odyssey or Legacy. I have to set the Ten Wheelers at three speed steps to match the Mogul running at one speed step.
Since you can supposedly lashup any Legacy engine I believe the new Mogul has a different gear ratio from the old odyssey version. I know the motor is different. The old one has a small Pittman motor and the new one has the common Mabuchi.
Its already been reported that the fasteners are different on the two Moguls.
This doesn't explain the lockup issue but may help explain why the early one runs fine. It has different parts from the new engine.
Pete