It shouldn't be the differential...that's a go/no-go type of deal. You should have 1 wheel driving at all times, at a minimum. Based on my experience, it sounds very much like low fluid, a slipping belt, or loose BGB.
There are bolts through the side plates on the transmission, that bolt into the bevel gear box (BGB). That is the box where your drive belt takes it's power from...the driveshaft from the engine inputs power to it on it's front side. Make sure all bolts into that box are tight...they take a 5/8" wrench. Should some a few on each side, and 4 on the front side, holding it to the frame. There is a yoke on the input shaft that bolts to the driveshaft...that needs to be sung by setscrew as well.
These Vickers pumps are very reliable, but if worn, will simply feel weak, not surge. It's possible you have a fluid obstruction, or are sucking air in somewhere. You would probably notice a moderate leak though, for the latter.
I have had this issue...my series of checks would be:
-Look for a leak (hoes, fitting etc)
-Check fluid level (up to or past little green plug on the side of the resevoir)
-Remove filter and run...replace filter if condition was remedied
-Check BGB bolts for tightness
-Check belt tension
-Check drive and driven pulleys (are keyways sloppy or stripped, is key or setscrew loose or missing)
-Check axle for play (key/keyway stripped, or axle tube cracked)
I would hope your pump is good...I suppose it is always possible that something has gone bad, but I've just not seen or experienced it. I'm pullin for ya.
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