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I'm going to go and look at a 67 couple that looks like it has some good parts for my fastback. The owner said it has a 9" in it and I told him that car came with an 8". I don't really want to crawl under the car if I don't have too. Just by getting on the ole knees, is there an easy way to spot a 9" over an 8" or vise versa?? Thanks guys!
 

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Look at the back of the center section. If it looks like this,

http://www.kevinstang.com/wy3.jpg

it's a 9 inch. If it doesn't have the hump, it's probably a 8 inch. There are some 1950's 9 inch housings that don't have the hump. But those are pretty rare today.
 

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Look at the back of the center section. If it looks like this,

http://www.kevinstang.com/wy3.jpg

it's a 9 inch. If it doesn't have the hump, it's probably a 8 inch. There are some 1950's 9 inch housings that don't have the hump. But those are pretty rare today.
 

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Another quick method. When looking from under the passenger side door looking back at the rear end, where the drive shaft connects to the rear end. The nut that is at about 7:00 will NOT be removable with a straight socket and ratchet extension, because the nut is shrouded by metal from the 3rd member itself.

On an 8 inch rear end, you can remove ALL of the nuts that hold the 3rd member in with a socket and extension on a ratchet...you have access straight on, versus the 9 inch in which you do NOT have straight access to that one nut at 7:00.
 

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8" rears the housings are more circular (_)

9" rears the housings are more oval (__)

From squatting that is the easiest and fastest way to tell a 9"

Snell
 
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