If you can figure this out you are GOOD!

[cbwhitley]

I have an 04 Disco with 55K miles. I have a vibration that I thought was a drive shaft, however after a rebuild ( and rebalance of the driveshaft) I have the exact same vibration. It most noticeable between 67 and 75 or so MPH. It is worse under load. For example..while going up hill at this speed the vibration is so bad that the rear view mirror is blurry. When I back off the accelorator the vibration basically stops. I have taken the following steps

1. Purchased new tires and had them rebalanced at another shop just to be sure.
2. rebuilt the front drive shaft as stated above

What else could this be?

1. Low trans fluid (plan to change it this weekend)
2. Bad motor mount
3. Bad trans mount

[Les Parker]

Have the front and rear diff bearings been checked for excess play?
Also the output bearings on the transfer box?
Did you have excess wear on your tyres? Expecially the outer edges?

[dunerunner]

It might be the CV joints up front. Had similar issues on my '94 D-90.