I dunno. With those things I'd never say never, but not likely it's the pump. If a pump(s) got to cavitating it would scream, but not really growl. I'm just fresh after changing the U-joints on one side of the front axle, and the noise that came from that under load before it went to pieces was best described as a deep growl. That's why I'd suggest looking at the front more... and it was felt right up to and through the foot boards.
Beyond that I'd ask if there's any trouble shifting it? What about the transfer case?
Again, probably 75% of the problems we've had with our 3930 have been FWD related. I've lost count of how many times the hubs have been apart for rings and planet gears. Also, a drive shaft problem will become much more evident at road speed than at low speeds. It will shake badly...
Hydraulics.... depends on how you have it plumbed. IF it's a dual pump model, the speed is decent, but by no means fast. If you have a loader joystick plugged into a remote, then you have a tandem center valve most likely, and you won't really get simultaneous function from that valve. If you operate the loader strictly off the remotes you should get some degree of simultaneous function from those valves if you set the flow control down somewhat. They are closed center valves... but I wouldn't expect too much if you're used to the performance of an industrial. We've got a larger pump on ours and squeeze a couple more gpm from it, but it's still not fast. It has plenty of power, but slow.
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Today's Featured Article - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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