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Old Sep 15, 2015 | 11:08 AM
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swmpbgy1
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Rear Diff.....



Greetings all.......


Attached is a pic of my door jamb sticker. Can some one please tell me which rear diff I have? Limited slip??


Also, I will be replacing the fluid in the rear diff....I found a Felpro rear diff gasket at Advance......is this ok to use? will it leak??


Thanks...........
Swmpbgy1
 
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Old Sep 15, 2015 | 12:37 PM
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3.73 open.
 
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Old Sep 15, 2015 | 01:52 PM
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Originally Posted by RobRoss
3.73 open.


Rob:


Thanks for the reply.......What does the open mean? Limited slip? Any comment on the felpro gasket?


Swmpbgy1
 
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Old Sep 15, 2015 | 03:40 PM
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Open means no traction aid.

You can run a gasket, but even the FSM calls for a bead of silicone by itself. You're going to need to run some silicone or similar sealant on that gasket anyhow, so I wouldn't bother.
 
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Old Sep 15, 2015 | 07:22 PM
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^Thank you Matt! Personally I wouldn't run a gasket either, just make sure the sealant you use is compatible with differential fluid. Permatex Right Stuff works well.
 
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Old Sep 15, 2015 | 09:41 PM
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Can't always trust them door stickers... My 03 F350 door shows 4.10 Open diff, axle tag shows 4.10 LS. It is indeed a LS rear too.
 
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Old Sep 16, 2015 | 08:49 AM
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Originally Posted by hav24wheel
Can't always trust them door stickers... My 03 F350 door shows 4.10 Open diff, axle tag shows 4.10 LS. It is indeed a LS rear too.


Thanks all........I will have to get a pick of the tag as well.....The open diff does not require the additive correct??


Swmpbgy1
 
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Old Sep 16, 2015 | 08:51 AM
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Originally Posted by swmpbgy1
Thanks all........I will have to get a pick of the tag as well.....The open diff does not require the additive correct??


Swmpbgy1
Correct. Get the truck on jack stands or a lift, put the trans in N and rotate one tire, if the other tire moves the same direction, it's limited slip, if not, it's open.
 
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Old Sep 16, 2015 | 09:47 PM
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So how do you get that from the sticker?
 
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Old Sep 17, 2015 | 06:13 AM
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Originally Posted by Restlesswildman
So how do you get that from the sticker?
I ran the vin in Oasis.
 
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Old Sep 17, 2015 | 06:50 AM
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ya, his sticker doesn't show anything under axle. Usually there's a # there. Like 42 would be 4.10
 
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Old Sep 17, 2015 | 08:42 AM
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Greetings all.....


Here is what I go off of the diff tag:


S 412 B
73 10 5 0D18


I think it's correct......the D may be a 9.


Let me know what yall think.


Swmpbgy1
 
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Old Sep 17, 2015 | 08:51 AM
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Originally Posted by RobRoss
^Thank you Matt! Personally I wouldn't run a gasket either, just make sure the sealant you use is compatible with differential fluid. Permatex Right Stuff works well.
I was looking on Advance Auto's website.....What size can of Right Stuff is big enough to seal the diff?


Thanks.....
Swmpbgy1
 
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Old Sep 17, 2015 | 09:22 AM
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Originally Posted by swmpbgy1
Greetings all.....


Here is what I go off of the diff tag:


S 412 B
73 10 5 0D18


I think it correct......the D may be a 9.


Let me know what yall think.
3.73 open.

Originally Posted by swmpbgy1
I was looking on Advance Auto's website.....What size can of Right Stuff is big enough to seal the diff?
Enough to run a bead around the diff cover.
 
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Old Sep 17, 2015 | 09:29 AM
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I used a gasket last time and it seeps, I will use RTV next time.


I have an open rear end but I am getting clutch chatter when turning so I am wondering if I have a LS rear axle. I need to add modifier, what is the correct Ford stuff for our trucks?
 
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