Ive had a Case 970 powershift for a few months now. It has been very dependable until the other day. It was running fine, went to move it was in 3rd range 1st gear mashed the clutch to shift to reverse and it stopped harder than usual. It now will not move in reverse and very jumpy in 1st other gears it moves fine. Also when you crank it up tractor runs fine til transmission pressure gets to operating pressure then the motor seems to load up, if you bump it on into second or third it then runs fine. Any help is appreciated, we run mostly late model deeres and i dont know much about these tractors.