My 1995 disco which has sat quite a while due to engine rebuild has really got me puzzled. At same time during engine rebuild I replaced rotors and brake pads. Now when I am ready to get the disco out of garage I crank the engine and shift it in to reverse or drive the vehicle does nothing. It is not shifting into gear nor is it moving. My four wheel drive gear shift goes left or right but does not move up. PLEASE HELP!!