You can find your rear differential ratio code by looking just above the passenger seat belt harness on the passenger side on the inside of the cab.  The code can be found just to the right of the word final, scroll down to see pictures.  Call us and use this code and we will determine the right ratio.  Call for pricing and availability at 1-877-564-6307 Press 1.  If you have any further questions speak with our sales team. 05-11-16
*Pictures are for Illustration Purposes Only*