Question for people w/37's... - Ford Powerstroke Diesel Forum
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Old 07-25-2014, 08:37 PM
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Question for people w/37's...

How many rpms are y'all turning at 70 mph? And what rear end is in your truck? I'm only getting 1600 rpms myself.
I'm trying to find out if the previous owner may have done the gear swap for the 37's since the speedometer is reading dead on. Truck is a 2013 f250 with 6" lift.


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Old 07-25-2014, 09:03 PM
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My guess is you have 3.55 or 3.31 rear end.

Mine has 3.55 and with 34" tires I run at 1850 rpm at 70mph I believe. 2000 @80mph

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Old 07-25-2014, 09:07 PM
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70 indicated or 70 via a gps or something? My speedo is off about 6 to 7 mph with 37's at that speed. Will check indicated at 70 next time I run it down the highway...I have 3.55's and it tends to run low rpms. I use the tow haul mode when doing stop and go with low speeds...seems to help by keeping the rpms up
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Old 07-25-2014, 09:08 PM
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Mine is actually reading dead on. Truck reads 70, as does the speedometer app on my phone.


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