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03-08-2003, 09:01 PM
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#1 |
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Registered User
Join Date: Jan 2003
Location: Seattle WA
Posts: 1,466
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rear end ratio ?
Is there a fairly accurate equation to figure rear end ratio if you know engine RPM and tire diameter?
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FocuzTech Performance Evergreen Protective Coatings Gatorhyde...the best kept secret in spray in bed lining & protection |
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03-08-2003, 09:10 PM
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#2 |
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Registered User
Join Date: Aug 2002
Location: Melville, SK
Posts: 1,145
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gear ratio = (rpm x tire diameter) / (mph x 336)
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2004 Silverado - Beater 1969 GMC - In progress http://67-72chevytrucks.com/vboard/s...d.php?t=441683 2011 Aveo - Work commuter 2013 Crestliner Fish Hawk 1650 - The reason no work gets done on the project truck. |
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03-08-2003, 09:11 PM
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#3 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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With the 350/350 combo you could have a 3.07 or a 3.73.
gear ratio = RPM XTire diameter divided by MPH X 336
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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03-08-2003, 09:13 PM
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#4 |
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Registered User
Join Date: Aug 2002
Location: Melville, SK
Posts: 1,145
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Hehe, beat you by probably 10 seconds.
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2004 Silverado - Beater 1969 GMC - In progress http://67-72chevytrucks.com/vboard/s...d.php?t=441683 2011 Aveo - Work commuter 2013 Crestliner Fish Hawk 1650 - The reason no work gets done on the project truck. |
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03-08-2003, 09:33 PM
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#5 |
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member #16
 
Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors  http://www.flickr.com/photos/1745471...7602865984234/ |
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03-09-2003, 12:48 AM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Or you could pop the cover off and chainge the 10 - 30 yr old oil and cout the teeth on the gears.
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03-09-2003, 06:56 AM
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#7 |
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Senior Member
 Join Date: Feb 2003
Location: WIS
Posts: 1,752
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ratio
jack up the rearend & count the driveshaft revolutions it takes for the wheel on one side to make one revolution. On a non-posi, just jack up one wheel......
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03-09-2003, 09:39 AM
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#8 |
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"Ochre Ogre"
Join Date: Apr 2000
Location: Springfield, MN
Posts: 3,558
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...but count the drive shaft revolutions during 2 full revolutions of 1 tire to get the approximate gear ratio.
and I like to use the calculators at Randy's ring and pinion. www.ring-pinion.com
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