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gear ratio?

764 views 2 replies 3 participants last post by  dieselcrawler 
#1 ·
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
-cj
 
#3 ·
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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