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The hydraulic system on a HMMWV is an "open" system, it has very little pressure until it is called upon to do some work.
It may be quieter with thinner fluid but the system will build whatever pressure is required for the task it is asked to do as long as the pump can supply it.
EDIT, otherwise...
Again all gear pumps make noise, that is why you will not find one from "an old GMC truck",, 99% of civy vehicles use a vane type pump because they are much quieter.
I'm sure you could fit a vane style pump from an earlier HMMWV with the built in reservoir but why? gear pumps are more dependable...
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