Hi Brodie,
I know your post is a few weeks old, but I wanted to see how you got on. I have a Pirate Monster and I stripped the planetary gears in the diff. I stripped it down, replaced the gears and packed it with 7000wt diff oil. The same thing was happenning to me, if I turned one of the shafts, the other turned the same way, whereas before they spun in opposite directions. I stripped it down and emptied a bit of the diff oil out, it helped but it still wasn't great.
I've put it all back together and taken it for a brief spin and it seems to be ok but I wanted to see if you'd had any probs or whether it had just worn in so to speak.
ManicMechanic........