I have a 96 GCL and it did the same thing and it was the catalytic converter. Which on the 4.0l it has been recalled. Call a dealership and give them your VIN and they can tell you if it has been recalled, if not a new stock one is only $40 at autozone.
Could be several reasons and pretty much the same for any vehicle: -Improper replacement -Bad forward universal joint causing vibration at transmission tail -Unbalanced driveshaft causing vibration at transmission tail -Bad transmission mount Universal joints usually "clunk" when bad Unbalanced driveshafts will cause a vibration when driving - the faster the speed the more the vibration
If you meant "Why is there a vibration, or vibration like sound when I'm driving" it is because either the drive-shaft is dented or one of the balancing weights is removed. Or basically it is not balanced, therefore vibration occurs.
I am assuming its your car that you are driving. Your wheels or axle could be out of alignment.
because something is about to break.
No...not typically. A bad PS Pump can cause a vibration while turning the wheels at slow speeds, like in a parking lot etc. Most likely a vibration while driving would be caused by, Out of Balance or Out of Round Tires / Bent Wheels or Axles / Bad Wheel Bearings / Bad CV Axle / Bad U-Joint or Damaged Driveline (RWD & AWD) Vehicles. These are the areas you should be checking first for "Vibration While Driving" Posting the speed your vehicle vibrates can also be helpful. :)
The power in the circuit will increase.
Risk
By driving the vehicle
(1)Bad tires, (2)front end alignment, (3)bent drive shaft are the most common reasons for vibration.
This is probably due to worn brake rotors on the brakes, if there is no vibration when driving then this will be the cause.
Steering wheel vibration when applying brakes is usually caused by warped disc brake rotors
It lones to move very jittery and uncontrolably.