gear ratio? - Ford Powerstroke Diesel Forum
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Old 12-16-2008, 04:43 PM
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gear ratio?

i am ordering a dp tuner and its asking gear ratio? i have a 99.5 f350 auto. How would i find out what i have in the rear? Was there options or did they all coem with the same? thanks alot
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Old 12-16-2008, 06:16 PM
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gear ratio will be on the tag on the rear-end housing..mine came with 3.73
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Old 12-17-2008, 07:18 AM
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there is a tag on the door that list an axle code, a number/letter combo, that will be decoded to tell you gear ratio and w/ or w/o LS rear... I think mine is "RC:21" which is 4.10 gears, L/S. It says it "axle" below it... Post that, and someone should have the list of what the codes are... I was able to find them doing a search, not sure if it's on this BB or if I found it on the WWW.
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