Allison Transmission Questions Greetings to ALLISON MAN; I have a 1996 diesel pusher with an 8.3 Cummins mechanical connected to an Allison MD3060R transmission. I pull a 24' trailer with my toys in it and the whole shebang (both units)weighs 40,000#. I find that in many situations, the transmission has difficulty shifting from 4th gear to 5th gear. It seems that the engine will go to governerd RPM Maximum and just stay there. I especially notice the problem when using the cruise control. I have to take the cruise OFF and then let the pedal back a little to get the transmission to shift up. I have it happen manually when climbing a slight grade. If I back off of the throttle, and let the engine shift at around 2100-2200 it pulls well in 5th. Can the shift point for 4th be reset so it will shift a little earlier at a lower RPM? I just hate to run at Maximum RPM's when the next gear will pull OK. Seems like a big stretch between 4th and 5th in the gearing. Looking for your thoughts on the subject.