The cab is designed to tilt back. If you notice there are back hinge points of the cab attached on top of the rear axle. Disconnect all the electrical plugs, there is no need to cut any wire at all. The AC lines have quick connects just above the fuel tank so there is no need to de pressure the AC system. Disconnect all the linkages, heater hoses and unbolt the front part of the cab leaving the back pivot points bolted. Get a lift or a few strong buds and tilt the cab towards the back of the tractor. This will open up the top area on the transmission where you can pull the inspection covers off and look down the transmission for your problems.