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Old 09-08-2019, 08:31 PM
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G2 rear diff cover.

I drained my old fluid tonight out of my Dana 44 rearwnd with a g2 diff cover. When I went to refill it took 4 quarts before it overflowed the fill hole!!!! Should I be concerned about this? Should I drain some fluid or before I drive?

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Old 09-08-2019, 08:36 PM
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Here is a picture of the diff cover
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Old 09-08-2019, 10:47 PM   #3
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that fill hole looks very high, seems your tubes would be full of oil at that point. Usually the fill or overflow hole is just above the bottom of the tube.
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Old 09-09-2019, 08:16 AM   #4
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you should use the recommended amount, the fill holes on most aftermarket diff covers are not set at the correct height for an overflow hole.

a D44 rear should take 2 qts
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Old 09-09-2019, 10:28 AM   #5
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^^^ This.

"High Fill" differential covers aren't the same as "High Capacity." The fill hole on aftermarket covers is raised higher to make filling easier rather than to increase capacity.

Unless specifically instructed otherwise by the diff cover manufacturer, fill with the same amounts recommended in the Owner's Manual and Factory Service Manual. An overfilled differential will leak oil through the seals and the vent tube.

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