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Thread: M939 What Fluid for Trans/Pwr Stg?

  1. #21
    4 Star General Gunzy's Avatar
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    Do what you feel is right for YOUR truck. As for me, 15W40 in engine, P/S fluid in P/S, 10wt in trans and PTO hydro, 80w90 in diffs and T-case. This should never cause any problems due to fluids. I found that 10wt is a lot less money than Dex III. Besides, if it was good enough for the military and has proven itself why change and possibly open a new bucket of worms. JMHO
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    I used tractor supply hydrostatic/hydraulic fluid. They are essentially all the same specs. Allison is looking for C4 certified IIRC which most universal hydraulic fluid is. The transmission takes pretty much 5 gals
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    I'm new here but spec should be spec, no?
    Heres what I've read as I'm sure you guys have too...
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    Last edited by Natron; 09-19-2018 at 19:05.

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    Quote Originally Posted by Natron View Post
    I'm new here but spec should be spec, no?
    Heres what I've read as I'm sure you guys have too...
    That is the TM 9-2320-280-20 which is for a HMMWV. Not a M939 series truck
    Last edited by simp5782; 09-19-2018 at 20:22.
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    4 Star General Scar59's Avatar
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    Stick to Gunzy's advice (post #21), can't go wrong. Cost varies with manufactures.
    I'm not saying let's eliminate all the stupid people. I'm just saying let's remove all the warning labels and let the problem work itself out.



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    My fault, when I googled this topic for my hmmwv it popped me right into the last page of this post, I didn't see the heading, sorry bout that.

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    3 Star General TechnoWeenie's Avatar
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    What about dex vi? Seems to be synthetic and supposedly backwards compatible with dex 3.
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    Quote Originally Posted by Gunzy View Post
    Do what you feel is right for YOUR truck. As for me, 15W40 in engine, P/S fluid in P/S, 10wt in trans and PTO hydro, 80w90 in diffs and T-case. This should never cause any problems due to fluids. I found that 10wt is a lot less money than Dex III. Besides, if it was good enough for the military and has proven itself why change and possibly open a new bucket of worms. JMHO
    I'm about to do some fluid changes in my 5ton/923A2 truck & I'm going with what Gunzy posted.

  9. #29
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    I was also wondering about Dextron VI....

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