How do I figure out what gear ratio I have? - Ford Powerstroke Diesel Forum
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Old 11-28-2007, 05:04 PM
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How do I figure out what gear ratio I have?

03 F350, 6.0L 4wd

Everything seems to be stock, I have no way to get it up in the air right now (for a few days), but need to know the rear end ratio

Is there a code somewhere? Or they were all sold with x.xx?

It does not have a towing package to my knowledge....would the VIN help?
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Old 11-28-2007, 05:07 PM
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There should be a tag on the diff and it will tell you the ratio.
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Old 11-28-2007, 05:37 PM
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was 4.23 an option?

Thats what I could deciper from the little tag
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Old 11-28-2007, 05:43 PM
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Hmmmm never heard of a 4.23. Was that the only numbers on there? For example I think a 3L73 is a 3.73 limited slip. Did you see anything resembling that?
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Old 11-28-2007, 05:52 PM
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Sadly, no...no recognizable rear end ratios on there..

There is a V 423 and a 73 10 5 3D25
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Old 11-28-2007, 05:57 PM
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Did they come with anything other than a 3.73 stock?
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Old 11-28-2007, 06:01 PM
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I believe they also came with 4.10's. Is there an axle code on the inside drivers door certification plate?
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Old 11-28-2007, 06:13 PM
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D1 is the axle code.

The reason for all this madness- I just got a livewire and Vivian @ DJs needs the info for my tunes...exciting!
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Old 11-28-2007, 06:18 PM
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D1 comes up as a limited slip 3.73.
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Old 11-28-2007, 06:30 PM
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Thanks dude!

I'm sending her the email now. Hopefully I'll have some tunes on by end of day tomorrow....now the only hard part is picking which ones to use! haha.
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