Most Hydro's are hard to push, as long as you can move it at all you are most likely in good shape. The guh sound is the hydro motor back pumping oil as it turning from the move.
I'm pretty sure if you jack up the rearend and turn one wheel the other is going to turn in the opposite direction, that the nature of them. These rear end are not a posi lock type where both wheels are locked together.
You should also make sure the brakes are not dragging other then that you are most likely ok.
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