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  #1  
Old 04-20-2011, 06:05 PM
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Angry RPMs too high

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.
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Old 04-21-2011, 06:10 PM
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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
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Old 04-21-2011, 06:44 PM
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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.
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Old 04-21-2011, 06:52 PM
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OEM Goodyear 275/65/20's are about 35", I figured the OP would be under 2000 at 70mph ???
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Old 04-21-2011, 06:54 PM
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Send a message via AIM to BIGBILL105 45
Different year truck but I'm at 2k rpms on 35s.
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Old 04-26-2011, 08:18 AM
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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.
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Old 04-26-2011, 11:18 AM
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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
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Old 04-26-2011, 11:19 AM
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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
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Old 04-26-2011, 11:41 AM
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My truck runs 2000 rpm with 35s and 3.73 gears.
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Old 04-26-2011, 05:51 PM
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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
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