Speed sensors car vibrate very bad when exceeding speeds over 60

U joints cause vibrations at all speeds. The higher the speed the worse the vibration. It doesn't go away. The vibration seems to be felt under the seats. If you feel it in the steering wheel, check suspension parts. Could still be tires, Like Tom suggested. It could be warped brake rotors. Rotors will get worse when the brakes are applied.

Sounds like a high speed balance issue. You might take it to a tire shop and ask for a high speed balance. It also could be tie rod ends starting to wear and you are hitting a speed where they want vibrate.

Hi M, Please describe in more detail what problem you are experiencing. Vibration is not correct at any speed. The gears can be changed at more or less any speed, as long as the engine maximum RPM is not exceeded and at slow speeds the engine does not labour by selecting too high a gear. Regards John

Instrument cluster - GM had problems with a part inside the cluster , Stepper motor , These faulty step motors caused the gauges to act erratically . 2003 to 2006 ! ALL GM vehicles . Just replaced a cavalier instrument cluster for what customer thought was a over heating problem .The fans come on low speed when engine temp. reaches 220 degress
The PCM commands the low speed cooling fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 104.25°C (220°F).
• A/C refrigerant pressure exceeds 1447 kPa (210 psi).
• After the vehicle is shut OFF if the engine coolant temperature at key-off is greater than 101°C (214°F) the low speed fans will run for a minimum of 60 seconds After 60 seconds, if the coolant temperature drops below 101°C (214°F) the fans will shut OFF. The fans will automatically shut OFF after 3 min. regardless of coolant temperature.
The PCM commands the high speed fans ON under the following conditions:
• Engine coolant temperature exceeds approximately 107.2°C (225°F).
• A/C refrigerant pressure exceeds approximately 1824 kPa (265 psi).
• When certain DTCs set.
At idle and very low vehicle speeds the cooling fans are only allowed to increase in speed if required. This insures idle stability by preventing the fans from cycling between high and low speed.

I'd be looking a the driveshaft ujoints.. Push and pull the driveshaft looking for any play at the cup areas.

you may have one of the cv-axle goes bad. jack one side of a time, put parking brakes on.
start the car and put in drive run up to speed and feel the vibration, the side has more vibration is the one that goes bad

vibration at highway speeds is normally a tire balance issue. take it to a tire shop and have them inspect and balance the tires.

Sounds like a bad u-joint or if its a 4x4 a bad cv-joint.

sounds like a cv joint to me. That is what usually occurs when one is showing wear. C.V joints usually wear out between 80,000 and 120,000 k.m.

most likely is not the engine but is a u joint in the drive shaft