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I am a new member here as I recently bought an '01 F-250 4x2. I haven't had the truck in the air yet to check it, but does anyone here know quickly what the axle codes are for the 2001 F-250? I think the tag on my door jamb says CA, but without looking that may not be right. I calculated 4.38 based on 3250 rpm at 70 mph in third (1:1) with 31.7" tires. I think the only options were 3.73 and 4.10, so I'm sure I have the 4.10 but thought I'd ask in case there was another ratio that I don't know about.