9" Rear Diff.
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Senior User
Joined: Aug 2008
Posts: 124
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From: Tuscumbia , Al
9" Rear Diff.
Just built new 9" rear diff. new Traclok and 3.50's all new bearings ect. Question is I have a leak between 3rd member and case used a gasket but was told by buddy not to use it. The factory did is this not correct ??
also i forgot to mention the copper washers do i get new ones or will a small amout of silicone not work ??? 
also i forgot to mention the copper washers do i get new ones or will a small amout of silicone not work ???
Last edited by rwlacks; Dec 25, 2008 at 08:58 PM. Reason: spelling
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
I haven't used a gasket on a 9" in 30yrs and only had one leak. blue or black rtv only. I have run them with and without the copper washers but will say the only time I had the leak I wasn't running them but many times I have done it and they didn't leak either. But with that said I believe I would get new ones especially if you don't plan on taking it apart very often.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 784
From: Simi Valley, CA
E3TZ4035B (replaced B7A-4035-A) .. Carrier Gasket
10) 373820S .. Copper Washer / Use w/3/8" stud / 13/32" I.D. / 19/32" O.D. / 3/64" thick.
The washers are still available from Ford, but no dealer in AL stocks them. If you special order them, you'll prolly have to buy the entire package of 40.
Ford parts vendor Green Sales Co. in Cincinnati OH has 320 of them: 800-543-4959.
Postmaster
Joined: Aug 2005
Posts: 2,760
Likes: 8
From: Gadsden Purchase
Get copper washers from the hardware store.
The ones I used were in the plumbing section.
They appeared to be "flare fitting washers". {shrug}
Every 9" I've rebuilt got no gasket and didn't leak except where I bent the
axle housing getting the stuck sucker out. ;) Had to take it out again anyway
so it was no sweat but with the housing straightened out, no leaks (at all)
the second go around.
Did you pry on the housing where it's leaking?
-------------------------
Gaskets are a pain. YMMV
Ultra Black was made especially for me and my hatred of everything gasket. ;)
Carburetor gaskets (on the other hand) get a generous dousing of silicone
spray or silicone grease.
Alvin in AZ
The ones I used were in the plumbing section.
They appeared to be "flare fitting washers". {shrug}
Every 9" I've rebuilt got no gasket and didn't leak except where I bent the
axle housing getting the stuck sucker out. ;) Had to take it out again anyway
so it was no sweat but with the housing straightened out, no leaks (at all)
the second go around.
Did you pry on the housing where it's leaking?
-------------------------
Gaskets are a pain. YMMV
Ultra Black was made especially for me and my hatred of everything gasket. ;)
Carburetor gaskets (on the other hand) get a generous dousing of silicone
spray or silicone grease.
Alvin in AZ
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