RPMs at highway speed

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Dec 30, 2005 | 02:34 AM

#31

KickinBlue4x4

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Joined: Aug 2004

Posts: 583

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From: Michigan

about 1700rpm - at 70 mph 3.55 LSD with 285/75/16

Dec 30, 2005 | 11:10 AM

#32

hyperspeed

Junior Member

Joined: Jan 2004

Posts: 1

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From: South Florida, USA

I have an 03' F150 5.4 with the 3.55 rear end. I am turning 1700 RPM at 60 MPH when towing my #5500 30' travel trailer. It sounds like you need to reduce your ring & pinion size. Bob

Dec 30, 2005 | 01:24 PM

#33

green06F150

Registered User

Joined: Dec 2005

Posts: 205

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From: Knoxville, Tn

I've got an '06 F150 XLT supercab with a 5.4 and 3.55 gears w/overdrive....I can cruise at 70mph @just under 2000rpms... I find, if I can keep it under 2000rpms, I can get from 18.5-20mpg on the highway...

May 27, 2013 | 02:02 PM

#34

Invenstory

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Joined: Jul 2012

Posts: 37

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2007 xlt screw 5.4 l 3.55 gears w/od, 20" rims w/stock Pirellis. The sweet spot seems to 1750 rpms at 65 mph. RPMs holds steady at slight incline or decline.