Ford 9" rear end
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Mountain Pass
Joined: Feb 2017
Posts: 205
Likes: 18
Ford 9" rear end
I can't get the rear center section to seal up against the axle housing on a ford 9". I've tried atv silicone, I've tried atv with a gasket, my latest attempt is a gasket with edelbrocks gasgasinch. What is the best way to stop the drops? Any suggestions would be appreciated, thx.
Senior User
Joined: Jan 2004
Posts: 265
Likes: 0
From: Lancaster CA
I have used black permatex with good results. You have to follow the directions but mostly, let it cure before adding any fluid.
Permatex does make a differential specific sealer if you cant get other solutions to work. Make sure the surfaces are free from bures and really clean before putting things back together.
Good luck
Permatex does make a differential specific sealer if you cant get other solutions to work. Make sure the surfaces are free from bures and really clean before putting things back together.
Good luck
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Mountain Pass
Joined: Feb 2017
Posts: 205
Likes: 18
This carrier has dripped ever since I've owned it, I'm tired of the drops on the floor for sure. I can see the oil seeping out from behind the nuts around the studs, I think these copper crush washers might do the trick, if not I'll try the permatex. Thx for the suggestion.
Lead Driver
Joined: Aug 2006
Posts: 8,094
Likes: 654
From: Brentwood, TN
I have seen and repaired more than one 9 inch housing that has had hairline cracks in the flange that mates with the differential. It is frustrating since there is no amount of sealant or washers that will stop the dripping if this is the case.
Fleet Mechanic
Joined: Feb 2015
Posts: 1,666
Likes: 111
From: southwest missouri
Mine seeps out of a weld in the bottom and back I think.. I don't know if I can weld with the grease in the rear end
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Welder User
Joined: Feb 2009
Posts: 5,269
Likes: 50
From: northwest MT
Mine also leaked from the weld bead on the back. Cleaned it real good and gooped it with RTV. No leaks so far. Next time I have it apart I'll weld it.
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Lead Driver
Joined: Aug 2006
Posts: 8,094
Likes: 654
From: Brentwood, TN
Just like any other crack in metal...drill out a hole at each end of the crack before welding it up. On the housings that I repaired I had them removed and on the bench. I guess they could be done while installed but care must be taken to ensure that all the grease/oil has been thoroughly cleaned out of the crack. tinman's fix is a good temporary solution.
Lead Driver
Joined: Dec 2012
Posts: 9,730
Likes: 823
From: Wentzville, MO
Don't weld with lube in the Axle.
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Mountain Pass
Joined: Feb 2017
Posts: 205
Likes: 18
The best I can tell it's seeping just around the bottom 4 studs. The axle housing is new the carrier is from an older 9", with only maybe 15000 miles on it. All I did was put a posi carrier to go with the new 31 spline axles. I'm really hoping the washers will do the trick.
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