Need some advice, gearing/fuel mileage.
Hey I know we have a big thread on fuel mileage going. I’m considering a 2020 Ram 3500 Crew Cab with the HO Cummins/Aisin and it has the 4.10 gears and it’s a dually. On a test drive it appeared to...
Forum Discussion
According to the BSFC map for the 6.7 Cummins that Shiner posted on another thread the 3.42 pulling in 5th vs 4.10 in sixth yield very similar MPG while towing. 3.42's should yield close to 10% better fuel economy while running empty at virtually any highway speed. Again, according to the same BSFC map, towing with 3.73 gears at 65 mph should offer a slight advantage in MPG over either 3.42's or 4.10's. Empty the 3.73 will fall half way between 3.42's and 4.10's.
I agree with Shiner in that it comes down to how you will use the truck ... if you run empty a fair bit 3.42's make sense. (I'd have a hard time not going for 3.42 no matter what) but if you're normally towing at 65 mph I'd go with 3.73's over 4.10's.
I also agree with Shiner that if you don't require the HO Cummins the regular output should do a little better on fuel.
I agree with Shiner in that it comes down to how you will use the truck ... if you run empty a fair bit 3.42's make sense. (I'd have a hard time not going for 3.42 no matter what) but if you're normally towing at 65 mph I'd go with 3.73's over 4.10's.
I also agree with Shiner that if you don't require the HO Cummins the regular output should do a little better on fuel.
