GM and Gearing

dodge guy wrote:

MFL wrote:

mkirsch wrote:
There is no free lunch. The "extra umph" comes at the price of increased fuel consumption, lower mileage, worse fuel economy, however you want to say it.

The 4.10's make the engine rev higher at all times. Higher revs consume more fuel, but also produce more power when needed.

Sounds like 3.73 is the only option with the gas engine in 2021, so there's no question here.

No free lunch, towing any trailer that size/weight. A diesel would net better mileage, but costs more overall. The only gain to be had with the gasser, is to slow down. I know...some people don't have time to slow down, so need to pay for lunch!

Jerry

Depends on it’s intended use. My V-10 Excursion cane with 3.73’s. 15 hwy and 6 towing and it sucked! Swapped to 4.30’s, my hey mileage dropped to 14.3 and towing mileage went up by almost 1 mpg to 6.8! Most off all the truck didn’t feel like it weighed 10k lbs, it could actually get out of its own way.

I saw the same thing. I had a 2011 2500HD with a 6.0 that had 3.73s. I traded it in 2015 for a 3500 HD with 4.10s both SRW CC. My hwy mileage dropped about 1 mpg on the interstate, but towing was better, not only in mileage but in performance. Much better at starting a heavy load. It downshifted less loaded and unloaded. The 6.0 makes its power at higher RPMs, so 4.10s keep it up where it wants to be run at. There was a reason that they only gave you 4.10s toward the end of the 6.0 run. It just is a better HD truck with that gear ratio.