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Old 01-09-2010, 03:54 PM
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Changing Fluid in Differintals

How much fluid do I need to put in my front & rear diff? I am going to use Royal Purple, it already has the additive! What weight should I use?
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Old 01-09-2010, 03:59 PM
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I just done mine with royal purple... I think it was 3 and half qts in the back and Im thinking 3ish in front... the rear im right, just not sure on the front. you'll love it.
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Old 01-09-2010, 04:00 PM
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Rear axle calls for 75W140 oil with the modifier, do you even have the limited slip though?

Front axle calls for SAE90
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Old 01-09-2010, 05:15 PM
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Aren't you supposed to fill until it gets to the fill plug level?

Have you guys thought about the aftermarket Maghytec diff cover? it is costly but it has a dip stick, a magnetic drain plug, and a built in bung for temperature sensor if you want to install one. It would be a snap to change oil with this diff cover.
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Old 01-10-2010, 06:49 AM
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Quote:
Originally Posted by mas360 View Post
Aren't you supposed to fill until it gets to the fill plug level?

Have you guys thought about the aftermarket Maghytec diff cover? it is costly but it has a dip stick, a magnetic drain plug, and a built in bung for temperature sensor if you want to install one. It would be a snap to change oil with this diff cover.
Yes fill until the oil runs back out.

Those maghytec covers are great but they're like $260+ and who really needs a dip stick? If its not visibly leaking oil then theres really no rerason to check it.
A good alternative is the factory aluminum cover on the 08-up trucks, they bolt right on to ours and are only about $60
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Old 01-10-2010, 07:23 AM
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Quote:
Originally Posted by md18 View Post
Yes fill until the oil runs back out.

Those maghytec covers are great but they're like $260+ and who really needs a dip stick? If its not visibly leaking oil then theres really no rerason to check it.
A good alternative is the factory aluminum cover on the 08-up trucks, they bolt right on to ours and are only about $60
Does this $60 cover have a drain plug? it is a pain having to take the entire cover off to drain, redo the seal before you can refill. Wonderful engineering design by Ford engineers....

How many owners change diff oil every 30K miles?

I hear what you say about the Maghytec cover......quite stiff at $260.
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