I have a Kubota M8580 that has the standard shuttle shift transmission. The problem has just started, when shifting from forward to reverse the transmission is hard to shift into reverse and jumps out of gear as soon as you start to let the clutch out sometimes. This problem is the same whether the tractor is in 4wd or not and in high or low gear, the problem is constant. I have just bought this tractor and am not very familiar with it yet, any help would be greatly appreciated. Thanks.