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help me pin down axle ratio

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Old Sep 28, 2008 | 07:58 PM
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From: Rockledge FL
Default help me pin down axle ratio

ok so i determined that the axle is not my original one.
the markings on it are 0H008W9E
.


OH is a marking for later model years.
mine is a 72.

i determined that OH was used in
78 and 79 with a ratio of 3:55
and 80 with a ratio of 3:07


how do i determine now which ratio i actually have.

the only other markings on the axle housing is the stamp GM1.
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Old Sep 28, 2008 | 09:24 PM
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If your speedo and tach are woking correctly then drive the car at 60mph in final drive gear and note the rpm's

my car has P225-70R-15 tires and turnes 2700 rpm's and is a 3:55


David
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Old Sep 29, 2008 | 08:03 AM
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Or you can jack the rear up, mark the rear tire. count how many turns the driveshaft u joint makes for one turn of the tire.
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Old Sep 29, 2008 | 08:37 AM
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Originally Posted by dmaaero
Or you can jack the rear up, mark the rear tire. count how many turns the driveshaft u joint makes for one turn of the tire.
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To help me pin down axle ratio





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