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I had removed the inter axle drive shaft and both axle shafts on the rear rear axle. That yielded much better performance, and I did not loose traction as the truck was street driven 95% of the time. It took me twenty min. to put it back together. After the Royal Purple I got 14 mpg. The ease...

Just before I sold my M51A1 I changed the gear lube in all 3 diffs and the transmission with Royal Purple MAX-GEAR synthetic oil. The increase in performance was very impressive. The truck ran very well and the tranny shifted very smoothly and quicker. I took it out on a route that I usually...