Hi, I have a Case 1070 that I recently picked up. Everything was going good on it until the other day when I was moving some bales. I was in 1st gear 3rd range and drove about 100ft, it started to feel like the transmission was slipping, like I was driving in mud. I stopped the tractor, and put it in neutral for a few minutes to get out and do a quick walk around. After I got back in the cab, I have no reverse, when I put the tractor into reverse, it doesn't even attempt to move, and bogs the engine down until I press in the clutch, I haven't tried going forward with it any more for fear I may screw some more stuff up. Any ideas on what I should be checking??? Thanks.