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,...
Forum Discussion
wilber1 wrote:
Yup. Peak torque at 1600 RPM so 1700 RPM would not be lugging, you just make less HP than at 1900 RPM. Don't know about the 48RE but my 47RE did not have tow haul and would not run in 4th with the torque converter unlocked.
On the first 48's 04.5-05 the torque convertor will only lock in OD (4th) when the tow/haul is off. With tow /haul on it will lock in 3rd and 4th. It will also lock in 2nd if you put the gear selector in "2". Tow haul was the only option on the 48's in 04.5-05. In 06 they started offering tow/haul and also OD lock out.
