4.56 dana

[19674x4]

does anybody know what rpm's the dana 60 with 4.56 runs, that is what i have and wondering if i should switch to a lower gear for gas mileage

[heep70]

Really high!!!! If you want milage then yes you should go to a taller gear. 3:73 or 3:54

[willowbilly3]

Depends on your tire height. My actual experience is a little different than most people. I haven't found the lower gears to be that much worse on mileage but the higher rpms do wear out the engine faster. I have had several highboys with 4.10 gears and got around 13 mpg on all of them, back when gas was good. I also had a 57 F-350 with a 312 and a 5.13 gear. I rwan it 65 all the time, not sure of the rpm but after about 30,000 it was starting to use a little oil.

[roachrider]

willowbilly is right. It really does depend on the tire height. I had 35's on my '67 until recently and I've got 4.56's front and rear. My highway RPMs were only about 2750 @ 60MPH. Before when I had 37's, it was even lower.

Althought, with that said, if you've got stock size tires, your RPMs will be pretty high with a direct drive tranny.

[19674x4]

iv'e got 33 inchers

[68F250]

Here ya go:

mph...rpm

50.....2321
55.....2554
60.....2786
65.....3018
70.....3250
75.....3482

[19674x4]

wow, thanks, looks like i will be on the lookout for some lower gears

by the way, does aybody have a gas pedal i could buy i seem to have broke mine somehow