Yes you do.. and a tube of rtv, no gasket onntheses

 

Ok thanks

 

Yes. You have about a 50/50 chance that a fluid & additive change will fix the issue. Noisy clutches are a very common problem with the 9.75" axle. Its a few hundred dollar job to have them changed if the fluid doesn't do it.

 

Ok so if I do have to change them, should I go to different gears/ratio I don't pull a tone just a couple mid size trailers, or should I look into doing something different with rear if I have to. Thx

 

The first thing I would be inclined to upgrade is the posi-trac unit itself. I S-canned the factory Trac-lock and installed a True-track. It engages very positively when called upon, has perfect street manners under normal driving circumstances and had no clutches to wear out.

 

Ok thx where is best place to buy or find them, thx

 

I would assume you're going to have it professionally installed by a shop that does that kind of thing. In that case I would buy it through the installer. Yes you'll probably pay a little more than if you bought it online, but you'll have a better relationship with the shop (they generally don't like carried-in parts) and an in-house warranty in the event something went wrong with the unit.

 

OP, if you are pulling the cover for fluid you might as well do the clutches + fluid. The clutches can be "fun". They are a wear item.

 

Well I got the oil today for it, I will look into the clutches for it, thx

 

Change the fluid and additive first. You've got a fair chance that will fix it with no further mechanical intervention. If not, then you can persue your options.