I know this thread will be moved but I wanted to make everyone aware of a problem. Some allison transmissions will not read more than 3 quarts low on the selector. When I had my transmission fluid changed it was improperly filled and left 5 quarts low. Some time later I checked it at the selector and registered 3 quarts low. I added 3 quarts and drove it 500 miles home and checked it, read 2 quarts low. Unaware of this problem I thought I had a major transmission leak somewhere. It was only a sharp Allison service manager at Clark Products in Cincinnati that told about this. He says he doesn't know why some do and some don't or the explanation of what is happening when it does. Thoroughly checked for leaks, none,added 2 more quarts and selector read OL OK. Downside cost me $200 to find this out.Thought I would mention it for what it's worth.
Wayne,Janice,and Cody the warrior boxer
2008 Newmar Ventana 3330 350HP ISBXT NVS
2007 Honda CRV, Bue Ox tow,US GEAR brake