OBS Rear Differential Fluid Question
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Joined: Dec 2014
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From: Lynnwood, Wa
OBS Rear Differential Fluid Question
Hey all. Recently serviced my rear differential on my 94.5 F250. Was researching online and people recommended 75w 140 (F1TZ-19580-B). So thats what i put in it. Its not a Dana axle its the ford axle with limited slip. After looking through my Powerstroke manual i realized that it called for Premium Rear Axle Lubricant (XY-90-QL) along with 8 oz of friction modifier (C8AZ-19B546-A) the manual also calls for the Premium Rear Axle Lubricant on Dana limited Slip axles slong with 4 oz of modifier. Then its says for Severe Use Dana F-Super Duty Rear Axles to use the 75W-140. It doesnt say to add any modifier for the 75w-140. I had bought some just in case but i ended up filling the axle with less oil than it called for so i figured i would just leave out the modifier and see how she does. I don't notice any difference. Should i be ok? I quess my question is, what have you guys put in your rear diff on your OBS trucks. Also what would some symptoms of not having modifier be? Thanks!
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