There should be a small metal tab attached to one of the bolts on the rear
differential cover. It will say either 3.9 (3.92 ratio) or 3.5 (3.55 ratio)
>
> When I ordered my 98 Dakota in July of 1997. I was told I could only get
> Sure Grip (Posi) and the towing package with the 3.92 rear end. So, I
was
> expecting a 3.92 rear end. When the truck was finally built and
delivered
> in December the window sticker listed a 3.55 rear end.
>
> Does anyone know how to tell which rear end I have? (Other than removing
> the transfer case cover and counting.)
>
> I would like to know for piece of mind. I would feel better about my 12
> MPG, if I found out that I have a 3.92 rear.
>
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