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Comparison with TM for M915 reveals the following for differentials:
+ 32 degrees: GO 85/140
+ 40 degrees to -10 degrees: GO 80/90
- 40 degrees: GO 75.
Don't have a LO for a M939 so not sure what authorized lubricant for transfer case on this truck is.
The best kept and most closely guarded secret in the United States Army is its publication system. If you obtain TM 9-2320-260-LO and read it will list as the authorized lubricant for transfer cases, differentials and transmissions for the 809 series trucks as GO 80/90 down to 40 degrees...
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