8.2 10 bolt rear end leaking, where is the vent?! - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-14-2010, 11:30 PM
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8.2 10 bolt rear end leaking, where is the vent?!

I built an 8.2" 10 bolt rear end with auburn posi, yukon axles, and 3.73 richmond gears. Also I had the housing Powder coated to match everything I did on the frame and front suspension; my question is this:
I know there must be a vent somewhere on the housing that probably got plugged during powdercoating, where is it? There is gear oil being pushed out of the rearend through the pinon. after moving the pickup around the shop I will find a small puddle under the yoke shortly after. I am fairly certain the pinion seal itself is not leaking so it's gotta be a plugged vent right? Thanks in advance for the help.

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Old 09-14-2010, 11:35 PM
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IIRC, Should be on the passenger side of the center casting where the axle tube is pressed into the center, pointing straight up. Will be a roughly 3/8" drilled hole, with a plastic tower vent pressed into the hole.
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Old 09-15-2010, 06:56 AM
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Yes, it's a plastic piece pushed into the center casting on the right side above the axle tube.
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Old 09-15-2010, 02:12 PM
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If you've just moved it around in the Shop that wouldn't cause enough heat/pressure to push any oil out.
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Old 09-15-2010, 03:44 PM
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You might look and see if it looks like its coming from around the Pinion nut. I put a small bead of RTV on the backside of the washer before I install it.
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Old 09-15-2010, 04:59 PM
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I smear sealant into the splines of the yoke before putting it in. Either way will seal it, but if you don't do it then oil will leak out.
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Old 09-15-2010, 07:07 PM
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The leak IS at the pinion nut, the seal is completely clean and dry

So you are saying I need to have RTV on the splines where the pinion mates to the yoke? I guess I just don't understand how the oil gets past the seal to the splines to begin with. Can anyone enlighten me?
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Old 09-15-2010, 07:26 PM
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Quote:
Originally Posted by artillerystevens
So you are saying I need to have RTV on the splines where the pinion mates to the yoke? I guess I just don't understand how the oil gets past the seal to the splines to begin with. Can anyone enlighten me?
yes, on the spline where the pinion is splined to the yoke. The spline is between the yoke and the shaft. The seal only seals the yoke to the housing, the spline continues on the shaft deeper than the yoke spline, and into the interior of the housing where the oil is. Yoke/shaft splines are not oil tight. Oil will migrate down the spline to the washer and nut that holds the yoke on the shaft, with no sealing there it will drip out.
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Old 09-15-2010, 07:44 PM
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I just had one of those ooooooooooooh i get it moments. Lol, I'd like to have an excuse like "im tired" but I guess it is jut one of those slow days. Thankyou very much for the help!
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