rpelatt

Installing a transmission temp gauge before the fluid goes into the cooler should tell if you are overworking the transmission. You can consult Allison about the maximum operating temperature they recommend and go from there. Add extra cooling capacity or a larger pan. Generally speaking, the only time you really need to be watchful is climbing long hills.

WOW! Thanks for the info! That also explains why diesel has remained so much higher than gasoline. For the last several years it seemed to be a total waste of money to buy a diesel powered car as the supposed 30 -40 % better fuel economy was dwarfed by the 50% higher cost of diesel fuel.