RPMs too high

[jaeger]

F350 on 20" rubber with 355s rus 2000 rpm at about 70mph. I don't like to run at such a high RPM.Would be nice to run 70-75 at about 1400-1500 RPM and would be easier on fuel as well.

[Beatngu]

You have the biggest OEM tire and the lowest gear ratio, you outta luck . Unless you want to fork out big $ for a 3.31 front and rear gear swap and retune

[wired1]

unless you drop the rear end ratio or do a gear vender over drive you wont see those rpms with factory 20's. and for what it's worth i am just under 2k at 75mph with 3.73's & 35" tires.

[Beatngu]

OEM Goodyear 275/65/20's are about 35", I figured the OP would be under 2000 at 70mph ???

[BIGBILL105 45]

Different year truck but I'm at 2k rpms on 35s.

[wide body]

consider yourself lucky, i'm at roughly 2250rpm at 70mph. my setup is a bit different though. i'm running a dually with 4.30s.

[Beatngu]

You sure you have 3.55s ? I just double checked and I'm a touch over 1800 with the
factory 20s and 3.73s in my F350

[Beatngu]

You sure you have 3.55s ? I just double checked and I'm a touch over 1800 with the
factory 20s and 3.73s in my F350

[at0075]

My truck runs 2000 rpm with 35s and 3.73 gears.

[jaeger]

yaaa ya guys I was blowen smoke outa the wrong pipe. I was just wishen for a few more gears to get those RPMs down a bit more but I should not complain cause my truck sure runs nice especially since I updated my Mini Max tuner.Thnx for your replies