Gear Oil vs Engine Oil for Transmission

[annihil8ted]

I'm a new owner so not sure what was done to it previously or when it was last done unfortunately

My thought process is to get to drain as much as I can, button everything up and do a level fill

If there is water, are there products I can use to clean it out?

 

[JKP]

Just refill it, drive it and drain it again soon to get water out.

You will know if it had water in it by the look of the old oil.

 

[Dexfire]

I've run the factory fill, MT90, syn 75W-90 that claimed it was yellow metal safe, and now 0W-40 syn in my YJ AX-15. Only difference I could tell is the synthetics weren't stiff on cold mornings like the non syn is. About 300K on it so far.

how often do you change the 0w-40 in your transmission?

 

[JKP]

It's been in there since '21, but I pretty much only drive the YJ during hunting season or on top down days. Maybe has 10K mi on it.

 

[Dexfire]

It's been in there since '21, but I pretty much only drive the YJ during hunting season or on top down days. Maybe has 10K mi on it.

oh interesting, I daily my jeep and I am thinking of changing the transmission oil every 6 months (10w40 full synthetic) not sure if that's ok or too early.