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M939 What Fluid for Trans/Pwr Stg?

Gunzy

Well-known member
1,769
65
48
Location
Roy, Utah
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
 

aheilmann68

Member
228
1
18
Location
North NJ
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
 

Natron

New member
13
2
0
Location
Buffalo, NY
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.
 

SCM35A2

Well-known member
Steel Soldiers Supporter
1,998
2,760
113
Location
Florence, SC
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.
 
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