Well, I have spent a lot of time and money rebuilding the front and rear drive shafts and still have a vibrations between 70 and 75 mph. I did however manage to fix the vibrations at 40mph only to develope some at +70mph. When I heard the thumping a week ago I got my 04 Disco hauled off to the garage just like Disco Mike told me to and had everything in the drive train replaced. The only thing we can think of is that the rear drive shaft is out of balance. It is a complete mystery to me and my mechanics now, anyone got any ideas?

 

Have them balance the driveshaft.

 

Have you had the wheel alignment checked too?

 

Had the wheels aligned, going to have the drive shafts balanced next.

 

Balancing them Monday. It is the only thing left!

 

Not trying to sound ignorant, but have you checkedyour tire balance yet? Didn't see it mentioned. You might have fixed most of the
problems but still have a tire issue.

-Kyle

 

When they rebuilt the front drive shaft, was the centerung ball kit replaced also, how about the roto flex on the rear shaft, any cracks in the rubber between the bolts?

 

Mine did the same thing and it ended up being the front output yoke was out of round.