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Old 03-17-2011, 01:12 PM   #16
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I overfill them and clean the excess after assembly and after the first couple runs so there's the absolute minimum amount of air possible inside the diffs.

How will you know the air/oil ratio if there's "x" amount of air inside? and thus...
How will you know your resultant resistance of that "unknown mix"?
Anal? you bet!

It does the same exact thing as having air inside the shocks.
The air expands when hot more than the oil thus the pressure is higher all the time, instead of for a while until it leaks the excess, so the diffs are even more prone to leakage.

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Old 03-17-2011, 01:14 PM   #17
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Originally Posted by morgoth View Post
To the top is too much. Diffs will leak easier and the oil will come out of everyhole when you're puttin it together.

Lutzinator had a nice tutorial on his website. This is how most people fill their diffs, and it's the best way imo.

Originally Posted by tc5 man View Post
some manuels of diffrent manfacters tell you to ethier fill the oil below the gear and just over the crosspins .

or fill to the top of the gears not compeltely filling the diff you whould be asking for a bad leak
Originally Posted by token View Post
Even Lutz used the term: perfectly full
They ...both...wiped the top of the ...top... gear to make it...perfectly full.
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Old 03-17-2011, 02:29 PM   #18
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My friend and I just started using our shock pumps on our diffs. It was for fun and to experiment but I always get one monster bubble out from below the gears!
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Old 03-17-2011, 03:25 PM   #19
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Originally Posted by razo125 View Post
If you completely fill your diffs with no air the diff will bind in longer mains when the oil heats up and expands. Your diff could even possibly hydrolock.
You're not going to hydrolock a diff.... The seals or O-rings would blow.
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Old 03-17-2011, 03:37 PM   #20
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Recommend filling to manufacturers specifications, as this is what is used/tested and put into the instructions for best performance.
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