Spike3
03-12-2014, 12:52 PM
This weekend is going to have super nice, sunny weather so what better way then to spend it outside having a Jeep improvement day. I've already got a new oxygen sensor that I'll install, but while I'm under there, I figured I'd change the oil in the differentials, transfer case and transmission (AX15 manual). The Haynes manual I have doesn't specify oils so I've turned to the numerous Jeep forums for help.
This is what I've found so far:
Differential: ~1.2 litres of 75w90 or 80w90 gear oil in the front, and ~1.7 litres of the same in the back (filled to the bottom of the fill hole, volumes are approximate).
Transfer Case: ~2 litres of ATF+4 (also approximated, I'll fill to the fill hole).
The transmission seems to be the controversial one. Some places say use 75w90 or 80w90 gear oil and others have said 10w30 engine oil. I've read to stay away from GL-5 gear oil because it will corrode the brass synchros and to get GL-4 rated. The motor oil weights seem pretty light so I'm not sure about that one either.
I found some 80w90 for $27 for a 5L jug, compared to 75w90 synthetic for $65 per 5L jug so I've bought the 80w90 for the differentials, but noticed that it is GL-4 and GL-5 rated, so maybe it doesn't corrode the synchros? It says on the front it's for manual transmissions and differentials among other things. Maybe I can use this? I don't have a link to it but it's Canadian Tire brand MotoMaster oil.
What do you use for your rig? What would you do if you were me?
As always, thanks a ton for your inputs! This forum has been a huge help!
-Spike
Edit:
This post (http://www.jeepforum.com/forum/f11/what-kind-gear-oil-do-i-use-my-ax-15-transmission-1326386/) seems very helpful in figuring out what to use. Also, according to Wikipedia, gear oils that are GL-4 and GL-5 compatible still have the yellow metal eroding additives, and that 75w90 gear oil has the same viscosity as 10w40 motor oil since they're based off of different standards. This makes everything much easier because I couldn't find any GL-4 only gear oils at Canadian Tire but will likely be able to find synchromesh-friendly motor oils there. The question still remains tho, what oil would you all recommend?
This is what I've found so far:
Differential: ~1.2 litres of 75w90 or 80w90 gear oil in the front, and ~1.7 litres of the same in the back (filled to the bottom of the fill hole, volumes are approximate).
Transfer Case: ~2 litres of ATF+4 (also approximated, I'll fill to the fill hole).
The transmission seems to be the controversial one. Some places say use 75w90 or 80w90 gear oil and others have said 10w30 engine oil. I've read to stay away from GL-5 gear oil because it will corrode the brass synchros and to get GL-4 rated. The motor oil weights seem pretty light so I'm not sure about that one either.
I found some 80w90 for $27 for a 5L jug, compared to 75w90 synthetic for $65 per 5L jug so I've bought the 80w90 for the differentials, but noticed that it is GL-4 and GL-5 rated, so maybe it doesn't corrode the synchros? It says on the front it's for manual transmissions and differentials among other things. Maybe I can use this? I don't have a link to it but it's Canadian Tire brand MotoMaster oil.
What do you use for your rig? What would you do if you were me?
As always, thanks a ton for your inputs! This forum has been a huge help!
-Spike
Edit:
This post (http://www.jeepforum.com/forum/f11/what-kind-gear-oil-do-i-use-my-ax-15-transmission-1326386/) seems very helpful in figuring out what to use. Also, according to Wikipedia, gear oils that are GL-4 and GL-5 compatible still have the yellow metal eroding additives, and that 75w90 gear oil has the same viscosity as 10w40 motor oil since they're based off of different standards. This makes everything much easier because I couldn't find any GL-4 only gear oils at Canadian Tire but will likely be able to find synchromesh-friendly motor oils there. The question still remains tho, what oil would you all recommend?