has anyone experienced a vibration in the disco2 at speeds of like 70+?

 

Sure. So what have you checked so far, what condition are your tires in, how often do you grease your u-joints, have you rebuilt your front drive shaft yet installing new servicable u-joint in the double cardon?

 

I talked to land rover and he said that installing new ujoints only can cause the driveshaft to go out of balance... true???

 

No, that is a typical Dealer response. So back to my first question, what have you checked so far, give us some help.

 

mike what are u joints ? and why do i need to grease them?

 

Your drive shaft has u-joints on it to allow it to flex and rotate to make your truck go. If they are not greased every year or 12,000 miles they will break with grease and you can pay upwards of $7000 in repairs.
That being said, and since you own a 4wheeler, I would really suggest you do everything you can to learn about what makes your truck work, it is much cheaper in the long run.

 

Thanks mike! And thats why I'm here asking you questions everyday so I can learn. However I do also do my own research so I dont have to flood you with questions.