94 Disco Automatic out here in no- mans land Costa Rica trying desperately for about a year to solve this vibration that is apparently coming from the drive train! Vibration starts about 35mph and continues thru 45mph. Much more noticeable upon acceleration and going uphill. Pop it in neutral and it goes away. I´ve read so many posts on this, and I have new motor and transmission mounts, new u joints front & rear, new balanced tires, new OEM rubber flex coupling (which helped a little). I was wondering if anyone has experience or information about the Land RoverDiscovery drive shaft conversion kit offered by Atlantic British. They claim that going to a direct shaft eliminating the rubber flex coupling solves the problem. WTH, any help would be appreciated!!!
Thanks for all the great information found here. You guys are life savers!

 

Did you ever get this figured out? I've got one between 25-30. Where in CR are you? I'm headed that way for a week at the end of the month. Love it there!

 

I had this, I checked front end, swivel pre load, bushings in pan hard,rebalance wheels, u joints in front drive shaft, I ended up putting in a rebuilt d2 front shaft and no more vibration

Ymmv