what rear gear lube f350 drw?? - Ford Powerstroke Diesel Forum
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post #1 of 1 Old 11-12-2009, 06:23 AM Thread Starter
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what rear gear lube f350 drw??

Just installed 3.73 from 4.10 and all new bearings. I have 500 miles on it now and want to change the gear lube. I have FREE 75W-90 synthetic. Or is it very important to run what the manual says 75W-140? I haul a 12000 lb. race car trailer about 15k miles a year.
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