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Is F-150 Still King?
 
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Old 02-10-2004, 10:01 PM
Mark76f250 Mark76f250 is offline
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80-86 Axle code decipher
I am looking at 1984 f250 to purchase. The axle code is 31 per manufacturer's sticker on driver's door jam. Could someone please tell me the ratio for this axle. Thanks.
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Old 02-10-2004, 10:07 PM
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DanMartin DanMartin is offline
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One stop shopping:

http://www.ford-trucks.com/articles/axlechart.php
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Old 02-10-2004, 10:18 PM
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bremen242 bremen242 is offline
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Unfortionately, axle code 31 is not listed. I think 31 is a Dana 61 3.07. 33 is (at least in 85) a Sterling 3.54, and 35 is a Sterling 4.10.

Best way to find out is look at the tag or the BOM on the diff, or jack it up and count the revolutions.
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Old 02-12-2004, 05:46 PM
clay01 clay01 is offline
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Yes. That list for some reason is only a partial list mostly from 1990 and up. My 86 F-150 has a code of H6 which is a 3.50:1 limited slip. It is also not shown on that list.
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Old 02-12-2004, 09:45 PM
67-72williso 67-72williso is offline
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Talking Gears ?
It could be a 3.00 gear in early 84. Get me a B.O.M.# off the axle and I`ll tell you what it is. Later Wilis
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Old 02-13-2004, 05:20 AM
8 Lugs 8 Lugs is offline
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#31 is a Dana 6250# Capacity axle with a 3.07 ratio.
This is out of the 1985 Ford truck shop manual.
The only way to tell what model it is, is to retrieve the #'s off the tag affixed to the rear cover.
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Old 02-13-2004, 05:58 AM
67-72williso 67-72williso is offline
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Talking
I think ford codes changed in 85, I`ll have to check into it. Later Willis
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Old 02-13-2004, 07:54 AM
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I'm am pretty sure that 8lugs is right. Sterling axles didn't have gears lower than 3.54s, so they carried over the dana 61 model. which had a different carrier for 3.07 gears.

I don't think ford changed the codes in '85, they just came up with different codes for the new sterling axles.
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Old 02-13-2004, 09:07 AM
Mark76f250 Mark76f250 is offline
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Thanks to all who replied. I am going to make the guy and offer on the truck today is he still has it.

Thanks
Mark
Rockwall, TX
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Old 02-19-2004, 11:52 AM
fornarog fornarog is offline
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I just bought an '86. The owner's manual has the de-coder for the rear located near the trailer towing section. I don't have my book with me, but if you need info, reply and i'll bring it tomorrow
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Old 02-19-2004, 03:18 PM
Mark76f250 Mark76f250 is offline
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Thank you very much for the offer. Someone was already kind enought to provide the answser I was looking for.
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Old 02-19-2004, 04:36 PM
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fornarog-

If you could post the contents that would be great to post on a site of codes.
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Old 02-19-2004, 09:45 PM
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another vote for 31 being a 3.07 ratio 6250lb dana.

52nd edition Hollander
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Old 02-19-2004, 10:25 PM
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Its nice to have the info available. Btw, have any one of you seen the code "H9B" for differental code? It was on a 94. It was factory track-lok front and rear diff. weird to see that, but nice truck
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Old 02-19-2004, 10:53 PM
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oldhalftons oldhalftons is offline
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my books don't go up to 94, sorry
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