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Old 02-11-2012, 07:49 AM
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12 bolt fluid capacity

I just finished putting a girdle support in my chevelles 12 bolt diff,the instructions said fill untill the fluid starts to drain out of the girdles filler hole not the oiginal one on the axle itself, it took 6 quarts of ams oil 75w90 as well as the 4 oz ams oil posi lube and is still 1/4 inch bellow the filler hole.I would think that that should be more than enough considering only 2 quarts came out when I dropped the stock rear end cover, has any one expeienced this sor of thing,the only place I know where the fluid travels and is stored is in the differential pot itself and the axle tubes. Did I do something wrong, any input would be greatly appreciated.
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Old 02-11-2012, 08:25 AM
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I wouldn't use extra lube. Just creates more aeration, which reduces lubrication, and creates more drag, which reduces how much power makes it to the ground.
Just run 2 quarts of good lube.
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Old 02-11-2012, 08:32 AM
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Ditto, 2-2.5 quarts plus your additive and call it good.
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Old 02-11-2012, 10:10 AM
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Quote:
Originally Posted by sapsz28
I just finished putting a girdle support in my chevelles 12 bolt diff,the instructions said fill untill the fluid starts to drain out of the girdles filler hole not the oiginal one on the axle itself...
That is the instructions for the Dana 35/44 diff.

The girdle cover for the GM diff uses the factory fill hole on the side of the housing as the full indicator- at least this is how it's done w/the TA Performance girdle cover.

In any event, using too much differential dope is not advised and you shouldn't need more than a pint more diff dope than used w/the stock cover.
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Old 02-11-2012, 05:32 PM
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Always use the factory hole for the "FULL" indicator. The cover will add a small amount of the oil capacity of the differential.
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Old 02-12-2012, 07:35 PM
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12 bolt fluid capacity

Thanks boys I used the stock filler hole to drain the diff, 3 quarts came out of the 6 I had put in, capped it back up and added 4 oz of AMS posi fluid.
Thanks again for the advice everyone.
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