12 Valve Engine and Drivetrain Talk about the 12V engine and drivetrain here. This is for 1994-1998.5 engine and drivetrain discussion only.

MPH vs RPM

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Old Apr 3, 2005 | 11:28 PM
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From: pa
MPH vs RPM

Trying to get better mpg on hwy. At 65 mph my rpm's are at 2k,my tires are about 31.4"(stock 30"). What are the rpm at 65 mph with 3.73 gears & rpm with 4.11 gears w/stock tires, this way i know what size tires i need to but on to make it seem like i have 3.73.

What is good rpm to run at on hwy?
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Old Apr 3, 2005 | 11:35 PM
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From: Houston, TX
http://dodgeram.org/tech/specs/axle/47auto.htm

Your corrected rpms would be .97 less than those since those are stock tires.
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Old Apr 4, 2005 | 12:00 AM
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From: pa
thanks i missed this page http://dodgeram.org/tech/specs/axle/47auto.htm
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