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Differential oil

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DYNOED-day!

About a year ago my differential lost a shim and wiped out the bearings. I found it before the gears were ruined.
The rebuilder told me any problems I had were agrivated by using 80-90 synthetic oil and that I should use 75-140 since I an hauling a 11,000lb trailer.
I am reay for service again. Can I use synthetic 80-90 in it (which I have) or should I stick with the 75-140?

Dick Clark

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93, Straight exhoust, BD converter & Injectors, PacBrake, gages, 33ftAutomate 5th wheel.
 
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