9" rear decode question
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Senior User
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From: South Burlington, Vermont
9" rear decode question
The rear end on my project is a 9" from a 70's? truck. The axle tag WDM-T decodes to a 3.50 open , 28 spline , 8.75 ring gear. The axle ends have the 3 circular dimples which leads me the believe its a 31 spline. Any ideas? I need to pull the center section to replace the leaky gasket anyway, I just want to know what to expect to see.
I'd like to put the 3.50 in my 71 mustang with 28 spline axles. The 2.75 in it now would go in the truck if the splines match.
I'd like to put the 3.50 in my 71 mustang with 28 spline axles. The 2.75 in it now would go in the truck if the splines match.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
1968/72 F100:
All WDM rear axles except the following have 28 spline axle shafts (C8TZ-4234-A) / Only WDM-H or J or AH or AJ have 31 spline axle shafts (C8TZ-4234-B).
1971 Mustang 9" could have 28 or 31 spline axle shafts.
F100/F150 9's: R/L axle shafts are the same / Mustang and etc. Passenger Cars with 9's have specific R & L axle shafts.
All WDM rear axles except the following have 28 spline axle shafts (C8TZ-4234-A) / Only WDM-H or J or AH or AJ have 31 spline axle shafts (C8TZ-4234-B).
1971 Mustang 9" could have 28 or 31 spline axle shafts.
F100/F150 9's: R/L axle shafts are the same / Mustang and etc. Passenger Cars with 9's have specific R & L axle shafts.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 783
From: Simi Valley, CA
btw: If you are planning to replace the differential bearings, there are two different types.
1970/73 Mustang will have "slim line" bearings. Depending on what year the F100's rear axle is from, it might have slim line bearings, might not.
There are two types of the non slim line bearings: Medium & Large.
WDM-T with 8 3/4" ring gear: 1968/69 & 1970 before serial number J30,001 have medium differential bearings. 1970 from serial number J30,001 & 1971/86 have slim line bearings.
These bearings have a BIN (Bearing Industry Number) stamped on them. BIN's are what auto parts stores & bearing shops go by.
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