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Rear Diff ID.?

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Old May 14, 2004 | 12:10 AM
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79stepside
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Rear Diff ID.?
i was told when i purchased this truck it had a ford 9in 31 spline, and i wanted to know if it was factory or not or how to tell?
 
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Old May 14, 2004 | 12:21 AM
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Yes Ford pickup
F-100's & F-150s came with a 9".

F-250's/350's usually have Dana's
 
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Old May 14, 2004 | 05:47 PM
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whew wipes sweat off forehead lol then i have a 79 stepside shorty
 
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Old May 14, 2004 | 06:11 PM
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The Box length & wheelbase mean nothing. Get rid of the shortbox theory.

It is the frame strength/weight rating & axles that are combo's. F250/F350
 
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Old May 14, 2004 | 09:03 PM
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shortys are theory because you have long box and short box so it can be theory and along with f250's/f350's mine is a f100 custom none of the above
 
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Old May 14, 2004 | 09:07 PM
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I'll try again.
When it comes to determining what rear Diff. you have... It doesn't matter whether the truck has a short bed or a long bed.

It is all about Truck specs mentioned above ...not the "BODY"

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Old May 15, 2004 | 10:27 PM
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Double check that rear, I'm fairly certain it was possible in '79 for a Dana 44 or other similar light duty rear to be found in the RWD F100. The identifying feature of a 9" is the carrier unit bolts to the front. It does not have a rear cover.

-Kerry
 
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