Differential gasket?
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Senior User
Joined: Aug 2005
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Differential gasket?
My Differential has been oozing for a while, I'm gonna clean it up, and replace the oil. Which oil should I use? Should I buy the gasket from NAPA, or use the silicone gasket maker, and which kind? I searched my Chilton's, Haynes, and this forum, but still can't find a clear answer to these questions.
Thanks,
M
Thanks,
M
Post Fiend
Joined: Apr 2005
Posts: 5,720
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From: Washington state
Aero diffs use a plastic reusable cover gasket and the cover on later Aeros is also plastic.
RTV beads up and rolls off into the diff lube where it causes gauling on the teeth and failed bearings
use this on both sides of gasket, let set up to tacky and put 'er on
http://www.permatex.com/products/aut...et_Sealant.htm
RTV beads up and rolls off into the diff lube where it causes gauling on the teeth and failed bearings
use this on both sides of gasket, let set up to tacky and put 'er on
http://www.permatex.com/products/aut...et_Sealant.htm
Posting Guru
Joined: Jul 2003
Posts: 2,222
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From: East Central Florida
I agree with 96_4wdr completely,
ALSO Don't use RTV or other types of gasket maker, especially if you have a Traction Lock diffy. Again contrary to other reply above, if you have a traction assist type differential, don't use plain gear oil either, without 1st ammending it with an additive, or just get an oil specified for Ford traction assisted set ups.
FBp
ALSO Don't use RTV or other types of gasket maker, especially if you have a Traction Lock diffy. Again contrary to other reply above, if you have a traction assist type differential, don't use plain gear oil either, without 1st ammending it with an additive, or just get an oil specified for Ford traction assisted set ups.
FBp
Last edited by FordBoypete; Jul 4, 2007 at 07:54 AM.
Lead Driver
Joined: Sep 2003
Posts: 7,016
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From: SoCal
I used Mobil 1 gear oil (75W90) in my Traction-Lok differentials. It smells like it has the friction modifiers already. I didn't have to add anymore, and my diffs seem to be working fine. Most other gear oils do not have that characteristic smell, so I would plan on adding it separately. But if you have to pay for the gear oil and the friction modifier separately, you've almost paid the same as the Mobil 1 would cost, so why not just get the Mobil 1? It's a very good synthetic gear oil.
As far as sealing the rear cover, all the ones I've opened up seem to come from the factory with RTV sealant. If you're careful about applying the stuff, you can prevent formation of the beads on the inside of the case. After many thousands of hard running miles with this setup, I've never had any problems.
As far as sealing the rear cover, all the ones I've opened up seem to come from the factory with RTV sealant. If you're careful about applying the stuff, you can prevent formation of the beads on the inside of the case. After many thousands of hard running miles with this setup, I've never had any problems.
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Happy 4th!!
Thanks for the help guys. I picked up a new gasket from NAPA; just from looking at it from underneath, it looks and feels like a gasket and not RTV, although there may be some used also, I'll find out when I open it up. The Chilton's says silicone/RTV, and doesn't mention a gasket. The door sticker tells me the axle code is 24, which is an "open" 7.5 axle. I could only find 80W90 gear oil (GL 5) so that's what I got. I don't need the friction modifier, right? I tried to find the Permatex 300, but no luck, I already had a new tube of red RTV, so I'll use a little of that.
Gotta get the grill fired up soon, and don't forget your Aerobeer.
M
Thanks for the help guys. I picked up a new gasket from NAPA; just from looking at it from underneath, it looks and feels like a gasket and not RTV, although there may be some used also, I'll find out when I open it up. The Chilton's says silicone/RTV, and doesn't mention a gasket. The door sticker tells me the axle code is 24, which is an "open" 7.5 axle. I could only find 80W90 gear oil (GL 5) so that's what I got. I don't need the friction modifier, right? I tried to find the Permatex 300, but no luck, I already had a new tube of red RTV, so I'll use a little of that.
Gotta get the grill fired up soon, and don't forget your Aerobeer.
M
Posting Guru
Joined: Jul 2003
Posts: 2,222
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From: East Central Florida
I think ya got it covered "M", get it? rear end cover, got it covered. . . . . 2/3 of a PUn huh.
Happy 4th Backatcha & GOD bless our troops who keep us the Best Nation on Earth.
FBp
Happy 4th Backatcha & GOD bless our troops who keep us the Best Nation on Earth.
FBp
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Just to follow up on this thread, I got the differential sealed and refilled, no problems, no leaks. What I thought was a gasket was actually black RTV, which was a bear to clean off. I used the new gasket from NAPA ($4.00), with a little bead of the red RTV around the inner flange of the differential cover. After I installed the cover, I let it sit for a few hours before I refilled it with oil, just to let the RTV set up for a while. After a week, still looks good. I was hesitant to use the gasket instead of RTV, but it looks happy to me. Thanks for the help!
M
M
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From: North Jersey, New Jersey
For removing the RTV Permatex makes a remover I'm going to try it next time I have to get old RTV off.
http://www.permatex.com/products/aut...et_Remover.htm
While doing a head gasket this weekend on one of my other cars. Sitting there with a putty knife carefully scraping out the burnt on RTV on the water outlet and cylinder head cover was so tedious.
http://www.permatex.com/products/aut...et_Remover.htm
While doing a head gasket this weekend on one of my other cars. Sitting there with a putty knife carefully scraping out the burnt on RTV on the water outlet and cylinder head cover was so tedious.