Originally Posted by StoneGuy
Is the vibration in the steering wheel at all or just seat of the pants? If the steering wheel is vibrating you probably a beering or tie rod issue or wheels could be out of balance. If it's seat of the pants it could be a u joint, driveline. It could also be engine mount or damper pulley or even a fly wheel. Too many damn variables. I suggest you start by checking the tires and wheels by jacking the front of your truck up and checking for wobble in the wheel or play in your steering components. Those are the most likely cause of vibration. Without knowing where you feel it coming from it's hard to nail down.
The vibration starts at idle, while parked... the vibration does not change whether the clutch pedal is pushed in or not...
I replaced the fuel filter today and put in some injector cleaner. After this change, I drove it approximately 15 miles under a load and it seemed to start showing improvement. After the horse ride, it seemed back to its vibrating ways...
Although I was told the clutch was replaced approximately 1 year ago, that is currently my thoughts on the problem. Keep in mind, I have a very limited knowledge of how this clutch system works, so I am only trying to make due with prior knowledge...