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decode the rear differential tag?

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Old Apr 6, 2006 | 06:58 AM
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decode the rear differential tag?

Anyone know where I can get info to decode the rear differential tag on my 1999 F-150?

Thanks.
 
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Old Apr 6, 2006 | 07:19 AM
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if its original this should help

https://www.ford-trucks.com/article/...r_Decoder.html

if not post tag info
 

Last edited by todd31277; Apr 6, 2006 at 07:29 AM.
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Old Apr 6, 2006 | 08:00 AM
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H9

Thanks.

The metal tag on the rear differential has several numbers/characters I wanted to decode, but I guess they aren't that important for my purposes.

Do you think there is any measurable difference in gas mileage between the 3.55 and the 3.73, under normal driving conditions and highway speeds?

Thanks again.
 
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Old Apr 6, 2006 | 09:36 AM
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not really sure as far as mpg. somebody on the board im sure can answer that one
 
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Old Apr 6, 2006 | 02:39 PM
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H9 is 3.55 Limited Slip.
 
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Old Apr 6, 2006 | 02:42 PM
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Originally Posted by 99 Ford
H9

Thanks.

The metal tag on the rear differential has several numbers/characters I wanted to decode, but I guess they aren't that important for my purposes.

Do you think there is any measurable difference in gas mileage between the 3.55 and the 3.73, under normal driving conditions and highway speeds?

Thanks again.
Not much. You probably wouldn't see more than 1 mpg or so difference.

Steve
 
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