Thread: How to tell if it is a Ford 9"
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12-05-2011 08:22 AM #1
How to tell if it is a Ford 9"
Howdy Gang,
Where do you measure to tell if it a Ford 9" rear diff
thanx
hank
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12-05-2011 08:52 AM #2
It will have a removable center section (from the front) and the way to tell if it is an 8 inch vs 9 inch (they look very similar) is to put a deepwell socket on the two bottom bolts that hold that center section on. If the socket goes on, it is an 8 incher. If it hits the casting and won't clear (so you need a box end wrench to remove them) it is a 9 incher.
Don
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12-05-2011 11:15 AM #3
Yep what Don said there is no where to measure to tell as there are MANY different length 9" housings.
http://www.carnut.com/specs/rear.html this may help youLast edited by cffisher; 12-05-2011 at 11:18 AM.
Charlie
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12-05-2011 12:04 PM #4
The 9" dimension refers to the diameter of the ring gear.Yesterday is history, tomorrow is a mystery, Live for Today!
Carroll Shelby
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12-05-2011 03:30 PM #5
Thanks guys
I'll try the socket or box end wrench tip
cheers
hank
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12-05-2011 04:59 PM #6
Hank, just to muddy the water a little, Ford also made a 9.375 rear end that looks similar to the 9 incher. It was used on some T Birds and other big Fords. Here is a pretty informative site on Ford rears:
High Q Ties - 9" Ford Information and Identification
And here is even more reading on the subject:
http://www.fordification.com/tech/rearends_ford04.htm
DonLast edited by Itoldyouso; 12-05-2011 at 05:02 PM.
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12-05-2011 05:12 PM #7
and to add to confusion. if it's a pulled axle, there is a chance it is a Toyota axle. They used dropout centers just like the Fords and the 2wd models are 5x 4.5". they measure about 8"You don't know what you've got til it's gone
Matt's 1951 Chevy Fleetline- Driver
1967 Ford Falcon- Sold
1930's styled hand built ratrod project
1974 Volkswagen Super Beetle Wolfsburg Edition- sold
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12-06-2011 08:45 AM #8
Thanks
Don for the axle id code
Matt for adding to the confusion
good info
cheers
hank
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12-06-2011 09:02 AM #9
Then if you really need more confusion, GM used a drop out differential in the '55-'64's and MoPar......'65-'76 (at least those are my "best guess" for years)Dave W
I am now gone from this forum for now - finally have pulled the plug
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12-06-2011 09:22 AM #10
Do they make aftermarket covers with drain and fill plugs?" "No matter where you go, there you are!" Steve.
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12-06-2011 09:33 AM #11
forgot about those lol..
Actually, a few years ago, I saw someone trying to pass off a Yota axle as a 9" on Ebay. There close to looking the same, but the rear 'dome' is larger on a Ford diff.. But even the pinion flange is simmilar on a yota axle.You don't know what you've got til it's gone
Matt's 1951 Chevy Fleetline- Driver
1967 Ford Falcon- Sold
1930's styled hand built ratrod project
1974 Volkswagen Super Beetle Wolfsburg Edition- sold
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12-06-2011 09:36 AM #12
You don't know what you've got til it's gone
Matt's 1951 Chevy Fleetline- Driver
1967 Ford Falcon- Sold
1930's styled hand built ratrod project
1974 Volkswagen Super Beetle Wolfsburg Edition- sold
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12-06-2011 11:09 AM #13
Chevy 1/2 ton trucks , 50's and early 60's used "drop out " (pumpkin design ) and they have a removable rear cover ..
Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance