Recently purchased my 2002 Disco II with 106K miles.. the vehicle vibrates at about 30 to 40mph, and then again around 70+mph. I've read extensively on this subject, and tried most of the recommended fixes:
Replaced front pilot shaft, ujoints, centering bearing, rear ujoints and doughnut. the vibration is not as bad, but still there... Not sure what to try next.. and would definitely welcome any suggestions..

thanks in advance for your help.

Disco203

 

Have you had your tires checked for Balance recently?

 

Check the rear roto flex for cracks, also inspect the front flange where the front drive shaft bolts to the t/case, is there any leak, the flange may be loose and need tightening or replacement.

 

Thanks.. first thing I did after purchase was new tires.

 

I've already replaced the rear rotoflex, but I will definitely check the front shaft/T-case. I think I did see some leakage. How involved is it to replace, if necessary?

 

Usually if that gets loose the seal cuts the flange seal causing a leak, then you replace the flange.

 

OK, well, no evidence of a leak around the flange... any other thoughts? How about the e-brake?

 

Check your wheels for being bent and look at both drive shafts to make sure you haven't dropped a weight. Might want to have someone check the balance of your rebuilt shaft also.

 

Could be any number of bushings that make up the front end.

 

Probably not, bushings don't usually cause a vibration at a certain speed.