Breather for rear diffential
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Postmaster
Joined: Apr 2004
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From: Santa Clarita
Breather for rear diffential
OK, I can't find a breather anywhere on my 9 inch ford housing? I have the connection for the brake lines on one side and nothing anywhere else. Are there 9 inch without the breathers? or where should it be? LOL.... Please help so I can breath easier 
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Postmaster
Joined: Apr 2004
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From: Santa Clarita
Morris, I looked everywhere. The Y connection for the brake lines, screws into the housing of the rearend with a bolt, I can't see how that would possibly breathe? . There is no breather around there. I did a search on the internet and it looks like most don't have a breather and some drill a hole and install a breather? I know my rearend is from a Early 60's F100 9 inch. Maybe they didn't come with one? Don't know.
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Postmaster
Joined: Apr 2004
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From: Santa Clarita
Originally Posted by 51dueller
The breather is the brake fitting bolt. Twist the top of that bolt and it should rotate. It's just a simple cap crimped over the end.
Fleet Owner
Joined: Jul 2004
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From: NM
There are two kinds; older ones have a bolt that has a sheet metal cap over the top, that like said above, is just crimped over to retain it. It is supposed to be loose enough to vent when the air in the axle heats up. Newer ones have a bolt with a barb fitting on top for a breather hose. It could be someone has replaced the special bolt with a plain bolt, in which case you need to get the right one.
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Postmaster
Joined: Apr 2004
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From: Santa Clarita
If someone replaced this bolt on my Y connection, this means my rearend is not venting? Is this the cause for my axle seal and pinion seal on the third member leaking? Am I building pressure in the rearend forcing the oil past the seals?
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Joined: Dec 2003
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From: Saskatoon, Saskatchewan
That would be my guess, a breather is definitely needed to relieve the pressure in the differential.
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Postmaster
Joined: Apr 2004
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From: Santa Clarita
Great! I've been driving my truck for 3 years like this and you guys tell me now? LOL.... Well, I know what I'm going to be looking for tomorrow... Thanks guys! Did I mention I hate previous owners?
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Postmaster
Joined: Apr 2004
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From: Santa Clarita
I was actually thinking about removing the bolt, drilling it out, tapping the one end and installing a barb fitting. I think that might work. Do the auto parts sell these vent devices?
