I have.a 1997 Dodge Ram 2500 with the stock 5.9 engine. I used to heat up on the slightest incline and while pulling my 29 ft 8000 lb camper it was a nightmare to keep it cool. Plus it struggled on hills. “UNTIL” I pushed the O/D button, disabling the over drive. No longer heats up and pulls up even the steepest longest hills around with attitude. Last hill was 7% or more for nearly 2 miles long and that temp gauge never climbed. I ate that hill up keeping my speed with traffic and not losing speed. All other hills I can easily speed up overtake and pass traffic. Who needs diesel? Not I. BTW I was Chevrolet my whole life until I got sick and tired of buying parts and working on them. Bought me a used dodge that hauls my camper with absolute confidence and comfort.