Help decoding another 9" rear end
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Freshman User
Joined: Jul 2013
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From: Chicago, IL
Help decoding another 9" rear end
Had the opportunity to pick up another Ford 9" rear end on the weekend which I think will be more appropriate to my needs. Am having some difficulty decoding the axle tag however. PO says it is from a 1971 F100 and the date code on the tag seems to support this, but I can't find a reference for the axle code WDM ADD - closest I can find is a WDM AD.
The full tag reads:
WDM ADD 1F30
3 25 9 S311B
I'm pretty sure from the tag it is a 3.25 ratio, 9", with a build date of 1971/Jun/30. Don't know if it is 28 or 31 spline.
The only table I found was on FORDification and does not list a WDM ADD.
Ford Rear Axle Assembly Identification - Page 03 - FORDification.com
My objective is to know where it came from for sure so I can order the proper new brake components. I can see that it had 2.5 inch brake pads but I don't know what size bore the wheel cylinder should be - there seems to be a wide choice from 7/8 all the way up to 1 3/16.
The full tag reads:
WDM ADD 1F30
3 25 9 S311B
I'm pretty sure from the tag it is a 3.25 ratio, 9", with a build date of 1971/Jun/30. Don't know if it is 28 or 31 spline.
The only table I found was on FORDification and does not list a WDM ADD.
Ford Rear Axle Assembly Identification - Page 03 - FORDification.com
My objective is to know where it came from for sure so I can order the proper new brake components. I can see that it had 2.5 inch brake pads but I don't know what size bore the wheel cylinder should be - there seems to be a wide choice from 7/8 all the way up to 1 3/16.
Fleet Owner
Joined: Jul 2004
Posts: 27,297
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From: NM
It doesn't have existing wheel cylinders? I have a '70 9" out of an F-100, also a WDM, these are the brake parts I used (also 2.5"):
Rear axle seal NAPA 15142
Rear wheel bearings NAPA 88128R
Backing plate gasket NAPA 55036
Brake hardware kit: NAPA 2241
Left wheel cylinder NAPA 17507
Right wheel cylinder NAPA 17508
Rear axle seal NAPA 15142
Rear wheel bearings NAPA 88128R
Backing plate gasket NAPA 55036
Brake hardware kit: NAPA 2241
Left wheel cylinder NAPA 17507
Right wheel cylinder NAPA 17508
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Freshman User
Joined: Jul 2013
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From: Chicago, IL
Thanks for the quick reply ALBUQ F-1.
No it came with the backplate, drums & shoes only - thus my question.
In my research I saw the NAPA cylinders you mentioned. These are also Dorman part numbers and are listed as 7/8" bore and for the 1/2 ton series. What is causing me concern is that NAPA also shows UP36057/8 and UP18290/1 and these are 1 1/8" bore which I thought might be appropriate since the shoes are the almost largest possible at 2 1/2".
I obviously have a lot to learn.
No it came with the backplate, drums & shoes only - thus my question.
In my research I saw the NAPA cylinders you mentioned. These are also Dorman part numbers and are listed as 7/8" bore and for the 1/2 ton series. What is causing me concern is that NAPA also shows UP36057/8 and UP18290/1 and these are 1 1/8" bore which I thought might be appropriate since the shoes are the almost largest possible at 2 1/2".
I obviously have a lot to learn.
Fleet Mechanic
Joined: May 2006
Posts: 1,696
Likes: 1
From: S.W. Florida
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