Broke axle
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Freshman User
Joined: May 2007
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Broke axle
Hey folks, here for some help again. I have a 66 F100 with factory 9" 28 spline axles. I broke one of the axles today (part heavy foot part mini spool I guess).Lasted over a year and a half of abuse so I have decided to go back with with the same thing instead of upgrading. So my question is what is the length of my axle shaft and (or) where can i find one?
Hotshot
Joined: Jan 2007
Posts: 11,564
Likes: 4
From: Tucson
This is from a Number Dummy post....
29 11/16" from splined end to inside of flange.
1 1/4" splined end diameter.
7 1/16" outside flange diameter.
https://www.ford-trucks.com/forums/9...66-axle-s.html
29 11/16" from splined end to inside of flange.
1 1/4" splined end diameter.
7 1/16" outside flange diameter.
https://www.ford-trucks.com/forums/9...66-axle-s.html
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
This is correct: B7TZ4234A .. Axle Shaft 28 splines / Right/Left is the same / Fits: 1957/67 F100.
Originally Posted by Bill W
If your rear axle is stock, it will have the small 
axle bearing. Read the link.
axle bearing. Read the link.It doesn't. In fact, all 1957/67 F100's w/a 9 inch use the large axle bearing (as do many 1968/86 F100/150 9's):
C9AZ1225A (replaced C1SZ1225B & B7A1225B) .. Axle Bearing / Use w/3300 lb. Rear Axle Capacity / 3 9/64" O.D. / 1 17/32" I.D. / 1 5/64" thick.
Additional large 9" axle bearing applications: 1966/86 Bronco's / 1969/74 E200's / 1975/86 E100/150's / 1957/59 & 1967/79 Ranchero's / 1957/73 Station Wagons, Police Cruisers and Thunderbirds (some '74/79's).
Small 9" axle bearing applications: 1964/74 E100's, all 1957/73 Passenger Cars (some '74/79's), except as noted above.
Hotshot
Joined: Jan 2007
Posts: 11,564
Likes: 4
From: Tucson
Guess i was thinking the later 9 inch rears (like my 72 ranger xlt)had a bigger outer bearing(the 9 inch that has the seal on the outside of the bearing) than the one's in the early 9's(which have the seal on the inside of the bearing)..... but guess your telling me they are the same size? I thought they were different
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
Bill W: There are indeed 2 sized 9" single piece rear axle bearings for the earlier housings - colloquially they are called large and small. Both of these are pressed onto the axle as a single unit and slip into the end of the axle housing. The seal, as you correctly note, is inserted first into the axle tube, between the entire bearing and the interior of the tube.
Our pickups only use the "large."
Some cars use the "small."
The later trucks - about '73 and later? - use the 2 piece bearing which you are describing, with the race being a separate piece pressed into the axle tube. In this later design, the seal is installed on the axle shaft first with the cage and rollers pressed on afterwards.
Note: It is entirely possible the single unit bearings - large or small - may have been used after '72, especially in the cars possibly. Bill ND can clarify that best.
Our pickups only use the "large."
Some cars use the "small."
The later trucks - about '73 and later? - use the 2 piece bearing which you are describing, with the race being a separate piece pressed into the axle tube. In this later design, the seal is installed on the axle shaft first with the cage and rollers pressed on afterwards.
Note: It is entirely possible the single unit bearings - large or small - may have been used after '72, especially in the cars possibly. Bill ND can clarify that best.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
Guess i was thinking the later 9 inch rears (like my 72 ranger xlt) had a bigger outer bearing(the 9 inch that has the seal on the outside of the bearing) than the one's in the early 9's(which have the seal on the inside of the bearing)..... but guess your telling me they are the same size? I thought they were different
Even though classified as a 9 inch, the ring gear is 9 3/8 inches.
The axleshafts are different, so are the axle bearings. Internally only five parts are the same as a 9 inch.
But...what you are thinking of...where the seal is on the outside of the bearing is...
In 1974 Ford began using a different 9" axle bearing (D4AZ1225A) in some of the cars/F100's, 1975 F150's.
The bearing comes with the seal as an integral unit, or the seal (D4AZ1177A) can be bought by itself.
The problem is...there is NO way NONE to know which axle bearing or seal the vehicle has...without tearing into it!
btw Mr. Wilson .. 1968/86: Did'ja noticed I danced around and said MANY?
I did not say ALL, cuz...Mr. Wilson knows better than to say that. This Mr. Wilson that is.
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Post Fiend
Joined: Nov 2000
Posts: 6,060
Likes: 7
From: Glendale Arizona
Bill
The differences are old style and new style. All are big bearing. The old style is the flat on top and rounded below and the new style is oval on top and bottom. Also the mounting T bolts are wider on the later new style so the backing plates do not mix and match.
outside diameter of the bearing remains the same but location on the axle changes based on offset.
I have a set of small bearing strange housing ends here i can show you.
Garbz
The differences are old style and new style. All are big bearing. The old style is the flat on top and rounded below and the new style is oval on top and bottom. Also the mounting T bolts are wider on the later new style so the backing plates do not mix and match.
outside diameter of the bearing remains the same but location on the axle changes based on offset.
I have a set of small bearing strange housing ends here i can show you.
Garbz
