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Thread: Topping off Trans/Transfer Case fluids, but don't know what's already in there?

  1. #1
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    Topping off Trans/Transfer Case fluids, but don't know what's already in there?

    I bought an M38A1 a month or so ago. I need to drain all the fluids and start from scratch because I don't know the history on it. Some of my gaskets are leaking underneath so it'll be a good time to just change out those gaskets all at once. In the meantime, I've enjoyed driving it. I've been getting some puddles on the garage floor so I wanted to top off my trans/transfer case so I could continue driving it until I had a free weekend to change everything and replace those gaskets. I've ready all the threads about different lubs.

    Main concern is, I don't want the trans/transfer lub to run dry while I'm driving it until I have time to change out the gaskets. I have noticed that it's not shifting as smooth lately and I know there isnt' a ton of oil in there to begin with.

    Here is my questions, if I don't know what type of lube is in the trans/transfer case is it OK to top it off with something like the Royal Purple Max Gear Syn 75w90 oil to get by in the meantime? I feel like it currently has a gear oil and not regular motor oil in it, because the spots dripping on my garage floor have that sulfur smell of gear oil.

  2. #2
    Super Moderator LarrBeard's Avatar
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    Doc Dana - this one is yours

  3. #3
    Super Moderator bmorgil's Avatar
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    No One65r, do not put hypoid oil in your trans and transfer case. Max Gear will work well in the Axles however. Here are two links to get you started. If you want to top it off use the right lubes. If it has been sitting that long, I would drain ALL the fluids ALL of them, and replace with the correct stuff. The things that happen to sitting lubes are not good for your baby. Drain them out and start with new, even if you don't have time to do the repairs to the leaks. The damage that water causes in there is just not worth it. I would not drive it all with 8 year old lubricants that have been sitting. They don't get the opportunity to heat up and evaporate condensate water. Acids can build up in the lubes from sitting and just ruin things like the sitting gas did to the carb. In sitting additives can separate and the lube can become a poor excuse for lubricant.

    https://willysjeepforum.kaiserwillys...d-transmission
    https://willysjeepforum.kaiserwillys...ight-Motor-Oil
    https://willysjeepforum.kaiserwillys...uot-Zerks-quot
    https://willysjeepforum.kaiserwillys...se-Lube-Levels
    Last edited by bmorgil; 07-25-2020 at 06:24 AM.

  4. #4
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    Thanks, makes perfect sense. I’m just gonna dump and replace all the fluids tomorrow afternoon and then replace any gaskets when I have time. At least if I do need to top any of them off, I’ll know what I’m adding too.

    On the trans/transfer oil, can you tell me an exact manufacturer/specs on what your using. Or even post a picture of the container

  5. #5
    Super Moderator bmorgil's Avatar
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    I use Red-Line MT-90 https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oil

    It is pricey. It's just one of those things I have used under some extreme circumstances. Good stuff.

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    Super Moderator LarrBeard's Avatar
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    A Doctoral Dissertation Indeed!

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    "It is pricey. It's just one of those things I have used under some extreme circumstances. Good stuff."
    I always trust bmorgil with his recommendations, so you can bet that this is a very wise advice.

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