Mountain Pulling

[TLightning]

quote:[i]

So, if you want to know about the differences between 250s and 350s - pretty simple, an additional leaf in the rear and some modifications in the shock valving - that is about it. Translates to more axle capacities, thus tongue weight per the specs. Otherwise, the trucks are identical. - However, watch out for the rear axle ratios in the future, Ford has moved to shallower rear ends (3.31 standard)for the 2010s.

We are DELIGHTED to now be the proud owners of(pics to come):

Maybe the differences noted above are true for Ford, I don't know, but there are more differences in the GM models. The reason Ford is reducing the rear end numbers is so they can 'increase' the MPG.

[8e3k0]

A lot has to do with RPMS, torque curve, plus tire sizes which are not the same from manufacture to manufacture on the 1 tons and 3/4 tons. Tire/rim sizes (circumferance) are different from a SRW than a dually. Common wheel sizes on the F 250/350 SRW are 18 and 20 inch where as the F 350 dually is 17 inch. At 65 mph he differential in rpms can be as high as 200. The F450 dually then jumps to a 19.5 inch rim. When you have the horsepower and torque with a diesel it's nice to run 1750 to 1900 RPMs at 65 MPH. Naturally as the rpms and speed go up the fuel economy drops proportionally.