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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Dumd axle question

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Old May 13, 2016 | 02:16 AM
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Dumd axle question

I wanted to know if I have a 8 or 9 rear ended I found the rag but not to sure where to start. Thanks
 
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Old May 13, 2016 | 03:07 AM
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Neither. The tag is indicating a 10.25" limited slip differential with a 4.10 ratio.

The 4L10 is the ratio with the "L" designating LS.
The next numbers are the ring gear diameter.
 
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Old May 13, 2016 | 02:39 PM
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V131A = Sterling WFD 10.25" rear axle with Limited Slip.

5H05 = Assembled August (H) 5, 1985 (5).

9" installed in 1957/83 F100, 1975/86 F150, 1966/86 Bronco, 1969/74 E200, 1975/87 E100/150 & misc 1957/80 Passenger Cars.

8" introduced in 1962 Fairlane/Meteor V8, only installed in misc. 1962/80 Passenger Cars.
 
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Old May 13, 2016 | 08:47 PM
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Thanks

Thank you for the info
 
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Old May 13, 2016 | 09:48 PM
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From your screen name (and the 10.25" axle tag) I assume you have an F-250 which, as Bill listed, wouldn't have a 9". Also as Bill listed, no trucks would have ha an 8". But an 8.8" on the other hand is what replaced the 9". See Bill's post for when the 9" was used in the F-150 and Bronco. After that (at least up to 1996) they used the 8.8". (I don't know or really care what Ford used in half ton trucks after that).
 
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