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1974 RL786LST
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Question
Scott74
Hi everyone,
I bought a 74 RL700L dump truck a few months ago on auction and am looking to get a little bit more info on it. I live in Colorado and use it daily to haul. It has the 10spd maxitorque transmission in it. I talked with the dealer they told me to put 80-90 gear oil in tranny. I am also putting the same weight oil in the differentials. Does the diffs require a thicker oil. I am hauling around 50k-55k gvw and changing about 4000ft in elevation. I've read on here some guys are using 85-140. Any help or suggestions is greatly appreciated. I am also looking to see where I can get a service manual for the truck. Thanks - Scott
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