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Rear axle tag decode please.

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Old Apr 4, 2008 | 10:51 PM
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Rear axle tag decode please.

I have the repair manual CD and all that info. I looked @ millions info to, but I can't figure this out. I'd like to know the gear ratio for a 79 2WD rear end. The tag info is as follows.

WDM-CJ 9DE
7 5 9 356A

I think the axle code on the other info tag says 13X (not sure).

I already know its a Ford rearend, not a Dana(no cover on back) As always all info appreciated. Thanks.
 
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Old Apr 4, 2008 | 10:53 PM
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Axle code 13

Post #26.

https://www.ford-trucks.com/forums/7...ords-have.html


X is for Power steering and the special weight rating of the front axle.
 
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Old Apr 5, 2008 | 07:10 PM
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Thanks Mil1ion. That answered that question. NEXT!............
 
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Old Apr 5, 2008 | 11:16 PM
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I don't know if he did answer your question, but the 75 on the bottom line should be 2.75, which is your gear ratio (2.75:1). The 9 means it's a 9 inch ring gear.
 
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Old Apr 5, 2008 | 11:53 PM
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The tag on my 79 2wd is as follows
WDM-CJ 8KC
2.75 9 356A
And now I will have 2 more posts than you....lol
 
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Old Apr 6, 2008 | 11:27 AM
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Originally Posted by Mil1ion
Axle code 13

Post #26.

https://www.ford-trucks.com/forums/7...ords-have.html


X is for Power steering and the special weight rating of the front axle.
learn something every day.I wasn't aware they put 2.75 and 3.00 ratios in trucks,which in my theory would be almost worthless especially with less than 400 cu.in. to pull it
my '78 Towncar had 2.7x ratio and got best fuel milage between 75 and 80 mph and around town was 12 to 13 mpg
 
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Old Apr 6, 2008 | 02:20 PM
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My truck has 2.75's in it and it worked fine with the 400 pulling the heavy holiday trailer.

Driving solo I would get as much as 22 mph / imp gallon hwy.

 
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Old Apr 6, 2008 | 03:35 PM
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From: Blairsville,Ga
Originally Posted by Mil1ion
My truck has 2.75's in it and it worked fine with the 400 pulling the heavy holiday trailer.

Driving solo I would get as much as 22 mph / imp gallon hwy.

it may be ok in flatlands but in the mountain country it won't cut it specially towing anything
 
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Old Apr 6, 2008 | 04:16 PM
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My 79 towed a 5th wheel before I bought it in 84 and it has the 351m.
 
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Old Apr 6, 2008 | 04:18 PM
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The only time I had a problem was climbing that monster grade on Hwy 93 North of Lake Louise

Want to see a pic ?
 
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Old Apr 6, 2008 | 04:42 PM
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From: Blairsville,Ga
Originally Posted by Buzzman
My 79 towed a 5th wheel before I bought it in 84 and it has the 351m.
I had 3 new '79 f-250s the last one I put 254k miles on,I pretty much know what they are capable of
 
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Old Apr 6, 2008 | 08:18 PM
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Maybe I didnt get all the dirt and grime off to see the 2. I'll have to take another look. If youre keeping track of post you now have 4 more the me buzzman. Summers coming and I'm sure I'll have plenty of questions as I get to work on my D.D. and the dumptruck. Always got something to tinker with on these two. Let the race begin. LOL!! This rear ends off a 4x2 with a 302 so probably didnt need the power as much. I couldn't tell ya.
 
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