AX15 to NP231 gasket/RTV?

[87MJTIM]

AX15 to NP231 gasket/RTV, is it necessary?

 

I was reading up on the ax15 conversion and found conflicting issues with the topic.  On another Jeep Forum, someone was asking for the gasket that goes between the two.  Some replies said to use RTV, some said neither was necessary, and others said that a PO had used RTV, so they used it also. 

 

From the "not necessary" responses, they said it is a dry connection so gaskets/rtv is not needed.

 

Some replies mentioned the AX15 weep hole.  The RTV would keep the oil from leaking out.

 

So which one is it?

 

My BA10 is sreeming at me, especially at higher RPMs (+2500).  I want to make the change this year.

[Megadan]

I have an AX-15 mated to an NP231J, no gasket, no RTV.  Each unit has a seal on the output (trans) and input (T-case) to keep them separated as they use two completely different kinds of oils.  Gear oil in one and ATF in the other.  If there is oil coming out of that section, then it's because one, or both, have seals leaking.  Now I could see some people using a bit of RTV to try and prevent dirt and grime from getting in there, but seeing as it's two machined surfaces being mated together, there isn't much of an issue.  When I pulled my T-case out of the ZJ that donated it, the whole thing was caked in dirt, oil, and grease.  The surfaces between the T-case and Trans were perfectly clean and shiny.  Said ZJ was used off road, went through water, etc.  It had no gasket and no RTV between the two.

That should give you an idea.

[87MJTIM]

Thx.

 

I did an AX15 in to a CJ7 with a D300.  Novak, which sold me the clocking ring, said I needed a gasket/rtv between those two.  They use the same gear oil.  Is it necessary on these?

[Megadan]

Well, if it is necessary, then I did mine wrong.  The factory did as well it seems, because three different TC's that I have dropped at the pick a part never had a gasket or sealer on them.

[87MJTIM]

RTV is cheep.  i may put it on for the insurance value.

[Rockfrog]

Thx.

 

I did an AX15 in to a CJ7 with a D300. Novak, which sold me the clocking ring, said I needed a gasket/rtv between those two. They use the same gear oil. Is it necessary on these?

That would have been for corrosion reasons, steel and aluminum means the steel will rust and the aluminum will corrode faster ... Although in both cases it is not a quick problem unless you live in the rust belt (if so it's more likely the truck will rust faster anyway).