What weight of gear oil - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 04-29-2008, 09:17 PM Thread Starter
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What weight of gear oil

Its time to change the gear oil in my Differentials. I am going to put Mag-Hytec Diff covers on both front and Rear Differentials. The question is what kind and weight of gear oil to use? I tow a 10,000 LBS fifth wheel trailer and do most of my towing in southern Nevada and Utah where the summer temp is over 110 degrees.
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post #2 of 5 Old 04-29-2008, 09:23 PM
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Originally Posted by Tom-Gibson View Post
Its time to change the gear oil in my Differentials. I am going to put Mag-Hytec Diff covers on both front and Rear Differentials. The question is what kind and weight of gear oil to use? I tow a 10,000 LBS fifth wheel trailer and do most of my towing in southern Nevada and Utah where the summer temp is over 110 degrees.
Amsoil Recommends 75W-140 severe gear synthetic lube...
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post #3 of 5 Old 04-29-2008, 09:25 PM
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Yup. Synth 75-140 in the rear and I think 75-90 in the front.

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post #4 of 5 Old 04-29-2008, 09:34 PM
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Yup. Synth 75-140 in the rear and I think 75-90 in the front.
you are correct... missed that
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post #5 of 5 Old 04-30-2008, 09:24 PM
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i have done mine twice in the past two weeks since i changed over to amsoil and still cant get it to seal up good. scraped, brushed, and cleaned it with brake cleaner. let us know what you use to seal it and good luck.
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