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Reading differential tag '90 F250 10.25"

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Old 04-25-2019, 03:54 PM
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cooksmtn
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Reading differential tag '90 F250 10.25"

Need a little help determining the specs on my rear end.
Door jamb lists C9
Tag on cover:
V 128 C
55 10 2 0C08
Don't know much about the truck, other than it seems to have been somebody's "project". Speedo reads about 11% low, so I'm looking for the proper gear for the end of the cable.
Anybody out there can give me info, I thank you in advance.
 
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Old 04-25-2019, 04:14 PM
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My research has turned up 3.55 limited slip.
So,,,with ZF wide ratio, any idea what speedo gear I need? I'm assuming I'll need one with fewer teeth. I have a spare from my '86, I may just have to crawl under and see what's there.
 
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Old 04-25-2019, 04:17 PM
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C-9 is a 3.55 limited slip differential, 10.25 axle.
 
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