Got a gilcrest on my gleaner now for 12 or13 seasons and no trouble with it. has worked fine in some really muddy years, a hub seal has started leaking this year, but no problem really. a long term deere mechanic told me it was better because it had a flow divider that kept both wheels turning where as a deere would send all the oil to the spinning wheel, this applies to the 20 series i dont know about the 9000 series