2013 Dodge 3500 DRW Gear Ratios
Hello everyone. The wife and I just purchased our first 5th wheel a few weeks back. It's a 2012 Forest River Sierra 345RET. It weights about 11,000lb dry. For a tow vehicle I'm looking at a 2013 D...
Forum Discussion
ah64id wrote:
Just did some quick math on the subject.
Lets assume pulling a grade at 55 mph using max torque and a flat value of 800 since I can't find the actual curve.
4.10's in 4th (direct) is 2450 rpms. 800*1.0*4.10 = 3280 ft/lbs to tires
3.73's in 4th is 2200 rpms. 800*1.0*3.73 = 2984 ft/lbs to the tires
So assuming that the 3.73 truck can hold 2200 rpms with 800 ft/lbs the 4.10 truck could decrease the power output to 2984 ft/lbs at the wheels or 727 ft/lbs at the motor. Less power means less fuel, less heat, and less stress.
Both trucks can do it, but which one is doing it easier?
There is no doubt that the 3.42 and 3.73 truck can pull like no tomorrow, especially compared to several year old trucks... but if your going to do it, do it right.. just my 0.02.
Or I can just put my 3.42' in third and have 3666 lb/ft. 800*1.34*2.42=3666. My truck has 850 lb/ft also.;)
