I have on 01, 6 speed with 62k on it. Have used the truck mostly for pulling 5th wheel trailers. (currently have an 06 34' Montana @ 14k pounds) Getting ready to change fluids in the diff's, & transmission. (May be a little overdue) Going to take a long trip this spring ending up in Alaska mid summer so thought I better get this done. I have read many posts on the different oils etc. My shop man says I should go with what Dodge recommends. What say you ?