Have you got a VIN? If so, plug-in the VIN at the end of this URL. That’ll pull up the window sticker, which lists the axle ratio.Any way to tell which you have without any documentation to go on, but simply looking at the truck? Dealer (Carmax) didn't know.
I gotta contact my dealer, because both my sticker and my nuts are missingThe 3.92 trucks usually have a “cash grass or ***” sticker in the windows. And/or brass nuts having from the tow hitch.
But yeah vin decoder usually works best.
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