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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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  #26  
Old 01-13-2009
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The chart is for manual trans in 4th gear at 65MPH.
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  #27  
Old 01-13-2009
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if it is based of of 65mph, and a 33" tall tire is 635 rotations per mile, and 4:11 is 2720 rpm

635x4.11/2720=.9595 that is the gear ratio the chart is based off of.

on an r1 overdrive is .79 so this chart does not directly apply your rpm would be 635x4.11x.79=2061.7815

its late so please correct me if im wrong
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  #28  
Old 01-13-2009
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ok if its based off fourth then it is right
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  #29  
Old 01-13-2009
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manual trans in 4th gear on an r1 is direct drive so it would still be inaccurate

3.27 and 31s at 70 in 5th = 1960rpm

31x3.141592654/12=8.1157 6160/8.1157x3.27x.79=1960rpm
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  #30  
Old 01-14-2009
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yeah thats right i thought it was based on 5th gear
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  #31  
Old 01-15-2009
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Here is what you're looking for...
http://www.therangerstation.com/tech_library/index.php
Bottom right side of the page under calculators.

Don't re-gear to match what came from the factory with 3.27's, lol.
I don't know which engine you have, but for the most part I would go with 4.10's with 31's if you re-gear.

Here is another good calculator I used before I re-geared. It was very accurate, you need to find out what the gear ratio in 5th is.
http://www.angelfire.com/fl/procrastination/rear.html
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