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Old 07-23-2004, 06:40 PM
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GM 12 bolt oil

My friend and I are putting a Eaton Posi in his '76 T/A. It's almost ready to put back in but we havn't put oil in yet. What is the oil capacity of GM 12 bolts and will gear lube be fine or is there somthing better? Thanks, Paul

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Old 07-23-2004, 07:56 PM
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not sure on the oil capacity but I would recommend 75W90 Red Line gear oil.
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Old 07-23-2004, 08:41 PM
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Red Line is a good one, as is Royal Purple Max gear lube. It already has the posi additive in it.

Vince
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Old 07-24-2004, 02:50 PM
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Just fill it til it starts to drip out of the fill plug. 3 qts. should be more than enough, I think.
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Old 07-25-2004, 01:44 AM
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I think they hold 4-1/4 pints, so slow down after you get 2 quarts in.
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Old 07-25-2004, 02:27 PM
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I heard you can microwave the gear oil so its easier to pour. Is this true?
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Old 07-25-2004, 03:45 PM
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Probably. I wouldn't do it in the container it comes in, though.

What I do is take a small length of 3/8" vinyll tubing and place one end over the tip of the container and the other in the rearend/tranny. Then I just squeeze the oil out. Works well and is easy to control the flow.
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Old 07-26-2004, 10:58 PM
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You can also use a siphon pump. Takes a little longer but its the best way in tight situations.

I use Mobil 1's synthetic in my rear and have no complaints.
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Old 07-27-2004, 01:40 AM
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Eaton does not recommend synthetic oil for their posi units. They specify conventional oil and limited slip additive. If you have a new Eaton, there should be a yellow card in the box with the recommended weight/lubricants listed. My 10 bolt took just under 2 quarts before it started running out. If you do circle track, they say to overfill it while racing.
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Old 07-27-2004, 04:40 AM
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I pour it in and stop when I see it come out of the filler hole.

I use VP diff fluid in mine
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