When is my Cummins the happiest?
I have a 2004.5 RAM with the 5.9L and the 4 speed automatic. I tow a 10,000# trailer for 18,000# combined. I find the transmission has awkward ratios at 55-60 MPH: At 55MPH - In drive, 1,500 RPM,...
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I have the same truck with a 3.73 rearend. I tow a 12K 5th. I put the selector in "D" and drive. I have towed in all kinds of traffic and all kinds of roads including some in your state. On Interstates it is 1800 rpm at 65 mph. I let trans do it's thing. Very seldom touch the T/H button.
