Thanks to fulltiming and Richard and Rhonda for the help. After going thru fulltiming's description it was apparent I had the gauges mixed up. After setting them to their proper ranges the tag axle unloaded some weight to the other axles and my transmission will downshift automatically once again. Everything is working well but the owner/operator. I was lucky not to blow a tag axle tire but fortunately is was not too hot and I was going pretty slow on back roads.
tag axle
Threaded Mode
