Manual Trans. Question.
#1
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Manual Trans. Question.
I own a 2007 5.9 Cummins that is a manual 6 speed. When towing a trailer should I keep it out of 6th gear, even on the freeway? Thanks for the help.
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My combined load on my last trip was about 19,300 lbs. I ran in 6th any time that I did not feel a need to drop a gear. I run an EGT/Boost combo guage and run using the EGT as a guide. If my temps start climbing that tells me it is time to drop a gear. I normally run about 60 mph when towing. Even with outside temps exceeding 100* the EGTs stayed around 900-1000* unless there was a hill in the way.
#6
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I think a lot of what you hear about not towing in OD comes from the guys using an NV4500. It was/is a great transmission but you can back the 5th gear nut off and lose od if you're rough with it.
From everything I've read thats not an issue with the NV5600 and the G56.
From everything I've read thats not an issue with the NV5600 and the G56.
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#10
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When I got my first Dodge, I e-mailed Cummins about the best RPM operating range.
Basically, they said not to lug it, which they defined as not running the engine with a load below 1600 RPM, or running the engine in a gear where the vehicle will not gain speed with the accelerator pedal on the floor...
Beyond that, they said any RPM up to the governed speed is safe, but, other than higher road speed in a particular gear, there isn't anything to gain by running over 2700.
Basically, they said not to lug it, which they defined as not running the engine with a load below 1600 RPM, or running the engine in a gear where the vehicle will not gain speed with the accelerator pedal on the floor...
Beyond that, they said any RPM up to the governed speed is safe, but, other than higher road speed in a particular gear, there isn't anything to gain by running over 2700.
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