Diff Break-in lube change? - Ford Powerstroke Diesel Forum
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Old 10-13-2007, 04:57 AM
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Diff Break-in lube change?

Been debating changing the rear diff fluid pretty soon as it's mostly broke in by now... What do you guys think? The manual says not to change til like 75K or some crazy stuff, but I've built axles, and know they do have a "break-in" period and I always change the lube after a few thousand K.
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Old 10-13-2007, 05:07 AM
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Diff Fluid Change

I just changed mine , front and rear, The color was a little darker that new,
BUT, most importantly I was able to put in Full SYNTHETIC,
And as you stated "you have built axles before" Don't forget you need a friction modifier in the rear of the stock limited-slip. I have 60K of 80% was mostly highway driving, BUT. As you already Know it cannot Hurt a Thing.
Only Help. I say "Like NIKE" Just Do It !!!
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Old 10-13-2007, 05:11 AM
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what lube did you use? what modifier also? All the axles I built were Detroit Lockers, so I just used 80-90 Valvoline with no modifier.
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Old 10-13-2007, 07:18 AM
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No break in required, you could drive easy to get it to temp the first time out before you start to romp on it, that's just for peace of mind.
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Old 10-13-2007, 07:35 AM
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I have 154,000 miles on the oem lube in my axles. I have only one problem with my axles. My rear diff input seal is leaking and I need to get it fixed. Other then that I have yet to have any problems with my diffs.
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Old 10-13-2007, 07:46 AM
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I just installed 4.30's and was told it is wise to change the diff lube after 500 miles in case of any metal shavings from the gears breaking in. Any opinions on that? And synthetic make any difference?
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Old 10-13-2007, 01:56 PM
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Smile rear

just serviced mine,after over 200,000 was amazed how good everthing was. Used amsoil.
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Old 10-15-2007, 04:22 PM
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Lube ?

I used 75w145 Synthetic Mobil 1 as reccommended in the dealer supplied owners mannual. I also run MagHy-tek Covers which have magnetic dipsticks and drain plugs. They work real well on collecting particulate.
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