I have a 1989 Bronco II with a 5 speed transmission and when Im going over 50 mph and I push the clutch in the whole thing shakes. It shifts fine with no issues and everything is smooth but when I get over 50 and push the clutch my whole bronco starts shaking. If I let off the clutch a little bit the shaking stops. I have no idea what it is and its driving me crazy!!! It also shakes when its not pulling hard, its hard to describe but when its trying to climb a hill and its pullin hard it doesnt shake but when I get my speed up or im going down a hill it will start shaking. Please help me figure this out!