Bob Mears
Bob;
Cooling. The friction losses in
the planetary at continuous high power would overheat the oil. The “towing
package” on most any pick-up or van likely includes a trans oil cooler
(did on my Dodge van). Most (I think) autos with higher powered engines
(again, mine does) have a trans oil cooing loop that is either part of the rad,
or in the lower (return) rad tank.
Al