Ford rear axle codes/ratios, ID tags

[hipogranada]

Scrounged the following information from this Web page:

home.comcast.net/~petebre/maverick/FoMoCo_rear_ends.html

Driving axle identification - Mustang II, Pinto, Bobcat, Granada, Monarch and Versailles


ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WDW-AB..... 2.79:1..........8............ C2
WDW-Z...... 3.00:1..........8............ C2
WDX-E...... 2.75:9..........9............ C2
WDY-AA..... 3.00:1..........8............ C2
WDY-HH..... 3.40:1..........8............ C2
WDY-S...... 3.40:1..........8............ C2
WFB-G...... 2.50:1..........9............ T4
WFB-K...... 2.50:1..........9............ T4



Traction-Lok Limited Slip Differential-Ford
Granada,Monarch,Versailles


ID tag......Ratio...... Ring Gear.... Differential
........................Diameter (in).... type

WFB-G...... 2.50:1..........9............ T4
WFB-K...... 2.50:1..........9............ T4




Axle codes from data plates


These codes are assembled for 70s Ford using the '78 shop manual, '75 light maintenance manual, and The Mustang Recognition guide. codes are fairly stable from 1969 to 1978, notes are made where needed. Please double check any codes not in the years 1969-1973, 1975, and 1978 since I can only assume the codes remained the same in the years my sources do not cover.

Conventional......Lock......Ratio
1.............J.........2.50
2.............K.........2.75
3.............L.........2.79
4.............M.........3.18 ('78), 2.80 ('69-'72)
5.............N.........3.07 ('75-'78) 2.83 ('69-'70)
6.............O.........3.00
7.............P.........3.40 ('73-'78) 3.10 ('69-'70)
8.............Q.........2.73 ('78) 3.20 ('69-'70) 3.18 ('72)
9.............R.........3.25
A.............S.........3.50
B.............T.........2.47 ('78) 3.07 ('69-'72)
C.............U.........3.55 ('72) 3.08 ('69-'70)
D.............V.........3.91
E.............W.........4.30
F.............X.........2.33 ('70)
G.............X.........3.55 ('73-'78)
H.......................3.78 ('72)
Y.......................3.08 ('78) 4.11 lock ('72)

[Jeff Roblin]

What years were D/V 3.91 ratio used in your books? 1969-73? I don't have that one.

same for E/W?

[hipogranada]

Jeff, I just copied/pasted from that Maverick board. Where they got the info, I don't know. Those sound to me like Drag Pak ratios for the Super Cobra Jet Mustangs, Torinos, etc.

I dug a little more, appears that the V could be locking differential from the Super Cobra Jet cars. That fits with the ratios too.

admin said:

What years were D/V 3.91 ratio used in your books? 1969-73? I don't have that one.

same for E/W?

[sixty9santa]

I'm going to change the gears in my differential to 3.55:1 or 3.80:1 once I'm done with the engine. I was just curious to know if the Granada's came with 8" and 9" differentials only or were there 7.5" in the mix as well?
I ask this since my differential ID tag is missing and the covers on the 8" and 7.5" are near identical.

[Jeff Roblin]

8's and 9's for the most part. To get an idea of common and popular ratios and codes, see my VIN database linked below:

www.gmv-registry.com/Images/VinDatabase.xls

[hipogranada]

The 8" doesn't have a removable rear cover. Like the 9", the back of the housing is solid - the whole carrier removes from the front for service.

The 7.5" started life in Fox-body cars beginning with the Fairmont in '78. It did not see service in Granada until 1981 when the Granada went to the Fox platform.

The 8.7" was used in some '75-80 Granadas. It does have a removable rear cover. It is not related to the 8.8" or 7.5", is pretty much an orphan and performance gearsets don't exist for that differential. It's reliable enough but parts just aren't available.

As Jeff suggested - check the axle code on your door tag. That will be a good place to start. Being a '76, more than likely it's an 8". There are plenty of good parts available for the 8" and unless you're pushing a lot of power and racing it regularly, the 8" should work very well.

sixty9santa said:

I'm going to change the gears in my differential to 3.55:1 or 3.80:1 once I'm done with the engine. I was just curious to know if the Granada's came with 8" and 9" differentials only or were there 7.5" in the mix as well?
I ask this since my differential ID tag is missing and the covers on the 8" and 7.5" are near identical.

[sixty9santa]

Thanks guys!
I payed a visit to drivetrain.com and have discovered that Granada's came with 7.5" for 1981-1982, 8" for 1975-1980, 8.7" for 1977-1978, 8.75" for 1975-1976 and 9"for 1975-1980

[hipogranada]

My '77 Granada, which I bought new in July of '77, has the 8"...
there are no absolutes on that 8.7". There was only one gearset offered far as I've seen, which I believe is 2.47.

My '77 is a 302/4-speed, and the rear gears are 3.00:1 -- the manual OD trans being the probable reason for the 3:00.

sixty9santa said:

Thanks guys!
I payed a visit to drivetrain.com and have discovered that Granada's came with 7.5" for 1981-1982, 8" for 1975-1980, 8.7" for 1977-1978, 8.75" for 1975-1976 and 9"for 1975-1980

[sixty9santa]

Well I found part of the differential's ID tag on the ground a while back and this is what was written on it.


ER - V 6DB
75 8.7 575B


And after doing some digging on the net, I found out that it was supposed to read:

WER - V 6DB
2.75 8.7 575B


Also, after a lot more digging around, I discovered that HiPo 289 Mustangs, Torinos and Broncos also had these 8.75" ring geared differentials......Some with 3.50:1 ratio's.
I wonder if it's possible to adapt a 9' ring gear in there?

[rebuild]

Question, are the axle lengths the same lengths in a N-C4AW-B diff. I found the diff and the axles but a drive away. Just wanted to know if both axles are the same.
hub to hub with axles in 59-1/4 but I can't find the axles lengths anywhere >> can ya help

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[Chuck P]

Does anyone know the axle length of a 9in rear end