I just changed my front driveshaft with a lucky8 one but i'm still getting vibration between 50 and 65 mph. Any ideas what it could be. Maybe just a regular alignment?

 

Wheels out of balance? Try a tire rotation and see if it changes.

 

Where can you feel the vibration, in your butt? Steering wheel? Under your feet?

 

Steering wheel

 

If its in the steering wheel it is either the tires out of balance or warped brake rotors.
Start by swapping tires front to back, does the vibration move to your butt now or still in the steering wheel?
Front tires out of balance show in the steering wheel, back tires in your butt.

 

I had the same issue. It did not go away until I changed out the rotoflex coupler in the rear drive shaft. Don't be fooled by it looking alright. You cant tell its condition until it is removed.

 

x2 on the coupler. Plus all the above.

 

I have had the same issue a couple months ago. It was caused by the dysfunctional electrical parking brake, the parking brake pads was loosed so it left too few space between itself and the brake disk, I replaced the EPB and rear brake pads, disks. Then the issue solved. Maybe different cause as yours but hope it can help. When you get the same issue again next time, please check if the rear brakes work properly. Usually it will become too hot to touch.

 

The Disco II has an EPB? I honestly don't know, but I thought that was introduced on the III.

 

Oh sorry. I think I jumped from a LR3 tread to this one but did not realize that