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

 

3.73 open.

 

Rob:


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


Swmpbgy1

 

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.

 

^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.

 

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

 

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.

 

So how do you get that from the sticker?

 

I ran the vin in Oasis.

 

ya, his sticker doesn't show anything under axle. Usually there's a # there. Like 42 would be 4.10

 

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

 

I was looking on Advance Auto's website.....What size can of Right Stuff is big enough to seal the diff?


Thanks.....
Swmpbgy1

 

3.73 open.

Enough to run a bead around the diff cover.

 

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?