Rpm
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Freshman User
Joined: Jan 2004
Posts: 26
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From: Gainesville
Rpm
What is the average RPM range of a stock 302 while driving on the highway.
I recently installed a t-5 in my '71 f-100 and I'm trying to figure what
gears I need in the rear end. Thanks.
I recently installed a t-5 in my '71 f-100 and I'm trying to figure what
gears I need in the rear end. Thanks.
Elder User
Joined: Jul 2005
Posts: 542
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From: Milpitas, CA; Tyler, TX
As I recall, it was around 1800rpm in Mustangs, although I'm not sure if that was with the 3.07's or 3.23's.
FWIW, most of the Mustang guys run 3.73's behind a 302/manual or 4.10's behind 302/auto. Those take it up to around 2000rpm. Owing to the weight of your truck I might look into 4.10's anyway.
I have a handy little excel calculator that takes tire size and gear ratios to calculate your RPM's for any given speed. If you like I could run some numbers for you, or PM me if you'd like me to e-mail it to you.
FWIW, most of the Mustang guys run 3.73's behind a 302/manual or 4.10's behind 302/auto. Those take it up to around 2000rpm. Owing to the weight of your truck I might look into 4.10's anyway.
I have a handy little excel calculator that takes tire size and gear ratios to calculate your RPM's for any given speed. If you like I could run some numbers for you, or PM me if you'd like me to e-mail it to you.
Posting Guru
Joined: Sep 2005
Posts: 2,238
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From: Kiefer, Northeastern Okla
RPM= 168 X Gear Ratio X MPH / Tire Radius
Tire Radius is distance, in inches, from center of wheel to top of tire.
Gear Ratio is Rear Axle ratio divided by Transmission Gear ratio.
Tire Radius is distance, in inches, from center of wheel to top of tire.
Gear Ratio is Rear Axle ratio divided by Transmission Gear ratio.
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TDbronco
Ford Inline Six, 200, 250, 4.9L / 300
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