AX15 Lubricant

[xjrev10]

Seems to be conflicting things online about what's acceptable.

 

10w30 is all you need? I was thinking on using a synthetic 10w30 like amsoil or mobile one which is spec for some transfer case rebuilders. I will run this in the t case but is it ok for the trans? The trans is a 97 if that matters. All the the specifications from back then are obsolete today.

[Rockfrog]

Transfer case uses ATF (Mercon/Dexron III).

 

AX15 uses standard 75w90 gear oil, the owners manuals ad a misprint and the recommemded oil spec (GL-5) was actually corrosive to the brass synchros. Use plain old off the shelf and cheap GL-3. Although some have also used 5 or 10w30 with good results as well.

[xjrev10]

Yes I'm aware ATF is what the factory says. I bought a reman np231 and the builder actually would void the warranty if anything but a synthetic 10w30 was used. That case has over 30k and counting now. But that ain't what this thread is about. Haha

 

So GL3 75w90 -or- plain ol 10w30 engine oil. (I would use Rotella. Same as the engine.)

 

Thank you.

[onlyinajeep726]

I'm running Redline MT-90 in my AX15.  Not cheap, but it's a very, very good lubricant.  I'd highly recommend it.  As mention previously, do not use GL-5.  GL-4 is fine.

 

http://www.redlineoil.com/product.aspx?pid=46

[1987Comanche]

OneOverZero runs Redline and he likes it.  I've used synthetic 10W-30 with Lucas in all of my AX-15s and they seem to do well.   I think anything but GL-5 would be just fine.

[FrankTheDog]

I put a 170,000 mile old ax15 in my XJ 3 years and 50,000 miles ago and it's still working great with Mobil 1 10W-30.

[BIGHEEP]

10w30 in the ax-15. That is what the Jeep dealer uses and recommends.

[mvusse]

GL3 and GL4 are obsolete and difficult to find. 10W30 is the recommended alternative.

[87MJTIM]

What about Pennzoil Synchromesh?  I had my BA10 serviced last year and shop owner told me to use that and not regular 75-90.

 

I am putting an AX15 into an '84 CJ7 and was going to use Synchromesh in that.  The trans came out of a 90 XJ.

[ftpiercecracker1]

ATF in the t-case? I have generic gear oil in mine, shaffers for my ax-15.

[xjrev10]

Yeah they call for ATF. Seems 10w30 is the lubricant for anything jeep nowadays!

[ftpiercecracker1]

Like I always say, earl is earl.  :yes:

[Darren]

I've always ran cheap 10-30 in several AX-15s and had zero issues.

[87MJTIM]

Ok, slightly off topic...but not too far.

 

My 84 CJ7 has a Dana 300 t-case.  The FSM says to use the same oil as the trans.  The D300 is gear driven, not chain. 

 

So, is it OK to use 10-30 in the D300 t-case?

[xjrev10]

On my scrambler, which has a 5 speed, somebody wrote in yellow paint marker that the fluid was changed at 95k with 75w90. I would also be curious about the 300 too.

[mvusse]

On a transfer case without brass synchros, GL5 should be fine including 75w90. Early 231 cases had a brass synchro between 2wd and 4wd high range, but I think later ones (94 and newer?) did away with it. I also didn't see one in the 94 242 that lives under my daughter's Cherokee.