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Old 03-29-2007, 09:56 AM   #1
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Default where to measure is RING GEAR DIAMETER

forgive my ignorance
but what measure is exactely used to state "ring gear diameter" like a ford 9 inch or 8.5 or 8.8 ?

A , B or C ?

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Old 03-29-2007, 11:47 AM   #2
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I measure the 'A' and you'll find some are 7-1/2 and some are 7-5/8. Both sizes have the same bolt size and pattern and same inside dia. for slipping onto the carrier.
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Old 03-29-2007, 12:42 PM   #3
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You will also find that higher numeric gears will be larger diameter because of the smaller pinion.
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Old 03-29-2007, 12:47 PM   #4
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You measure at " A " ..
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Old 03-29-2007, 04:29 PM   #5
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oke thanks, so the biggest diameter is the one to go for

eventhough in theory a 6:1 ratio on a small carrier could mean a bigger RING DIAMETER then a bigger carrier with a 2:1 ratio ?


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Old 03-29-2007, 06:49 PM   #6
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There is no real difference between the 7.5/7.6. The ring gear design was never actually changed, just the pinions looked slightly different and the carriers were slightly different. Getting a 7.6 ring gear in place of an old 7.5 will be no gain, and all the aftermarket stuff is the same.
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Old 07-31-2008, 10:58 AM   #7
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I know I'm dredging up an old post, but could this be added to the FAQ thread on this forum? I was wondering about how they measured these to, and had to search for it, when I think it is a FAQ for some newbs like me.
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Old 03-24-2010, 05:36 PM   #8
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Good idea
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Old 03-25-2010, 10:52 AM   #9
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Quote:
Originally Posted by mzoomora View Post
You will also find that higher numeric gears will be larger diameter because of the smaller pinion.
Not really, just thicker b/c of the smaller diameter of the pinion. You would have to have a shorter in length pinion to have a bigger diameter ring gear.
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Old 03-25-2010, 10:52 AM
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