NEED HELP - 96 Cobra Problem another one

i originaly bought this car to restore but divorce forces me to drive it , ONLY at 20 miles an hour 1500rpm i feel the car is jerking , feels like tires are out of balance badly but tires are ok no bent axles and feel it in 4 gears cant do 5th doing 20mph ONLY when i push in the clutch it goes away , at higher speeds i feel nothing .what gives bad something please help. also please read my other posts i need answers thx

sorry about the the bad way i decsribe things , well 1 of the clutch forks does hit the T/O bearing i accually feel the tranny is on its way out accually the drivashaft does move in the bearing in the tailhousing but not to to bad so i think that bearing is bad as well, and just replaced the axel bearings last week , i know the car was hard drivin before i bought it and it sat for 3 years ,but the car has a jerking motion when your driving it at 20 mph when the clutch is depressed while coasting the jerking stops so it isnt tires