xjrev10 Posted October 18, 2014 Share Posted October 18, 2014 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. Link to comment Share on other sites More sharing options...
Rockfrog Posted October 18, 2014 Share Posted October 18, 2014 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. Link to comment Share on other sites More sharing options...
xjrev10 Posted October 18, 2014 Author Share Posted October 18, 2014 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. Link to comment Share on other sites More sharing options...
onlyinajeep726 Posted October 18, 2014 Share Posted October 18, 2014 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 Link to comment Share on other sites More sharing options...
1987Comanche Posted October 18, 2014 Share Posted October 18, 2014 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. Link to comment Share on other sites More sharing options...
FrankTheDog Posted October 18, 2014 Share Posted October 18, 2014 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. Link to comment Share on other sites More sharing options...
BIGHEEP Posted October 18, 2014 Share Posted October 18, 2014 10w30 in the ax-15. That is what the Jeep dealer uses and recommends. Link to comment Share on other sites More sharing options...
mvusse Posted October 18, 2014 Share Posted October 18, 2014 GL3 and GL4 are obsolete and difficult to find. 10W30 is the recommended alternative. Link to comment Share on other sites More sharing options...
87MJTIM Posted October 18, 2014 Share Posted October 18, 2014 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. Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted October 18, 2014 Share Posted October 18, 2014 ATF in the t-case? I have generic gear oil in mine, shaffers for my ax-15. Link to comment Share on other sites More sharing options...
xjrev10 Posted October 19, 2014 Author Share Posted October 19, 2014 Yeah they call for ATF. Seems 10w30 is the lubricant for anything jeep nowadays! Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted October 19, 2014 Share Posted October 19, 2014 Like I always say, earl is earl. :yes: Link to comment Share on other sites More sharing options...
Darren Posted October 19, 2014 Share Posted October 19, 2014 I've always ran cheap 10-30 in several AX-15s and had zero issues. Link to comment Share on other sites More sharing options...
87MJTIM Posted October 20, 2014 Share Posted October 20, 2014 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? Link to comment Share on other sites More sharing options...
xjrev10 Posted October 20, 2014 Author Share Posted October 20, 2014 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. Link to comment Share on other sites More sharing options...
mvusse Posted October 20, 2014 Share Posted October 20, 2014 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. Link to comment Share on other sites More sharing options...
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