goducks10 wrote:
RustyJC wrote:
boshog wrote:
A SRW 3500 with 3:43 axles doesn't have any issue whatsoever tugging 15K along America's highways. Just maybe, that is why RAM's engineers made the 3:43s standard on a SRW.
The 3.42s on all SRW 2500s and 3500s are a result of government fleet fuel economy mandates.
Rusty
I didn't think 3/4-1 tons fell under EPA MPG guidelines. Why do 2500/3500 6.4s come with 3.73s? They could put 3.42s as standard on them and even better fuel economy.
Yes, even though fuel mileage may not be shown on the Monroney sticker, these trucks are included in the fleet fuel economy figures of a manufacturer that are subject to EPA targets. The 6.4L Hemi gas engine uses a 3.73 axle ratio simply because it's a gas engine and needs it - its torque and horsepower peaks at a higher RPM than the diesels.
Until the EPA corporate fleet fuel economy mandates hit, Ram always offered optional axle ratios for all of its 2500 and 3500 diesel-powered trucks. That's not the case today - you have to go to the 3500 dually to get your choice of a 3.42, 3.73 or 4.10 axle ratio. All the SRWs get 3.42s.
Rusty
