Hi Streaky
Hows things, was at ards wedding yesterday good grub and free beer ....... what more can you ask for
Anyway have pretty much the same set up as you 764 on the front 762 on the rear, 265x75, caster corrected arms and had bad vibes. I took a d2 front prop and a 200tdi rear prop this cured all vibes in one go. Also gives the advantage of dumping the rubber donut on the rear prop. Thats a three inch lift with no vibes and self centering steering. If you go down this street you will also need the flange from the transfer box for the d2 prop and the rear flange from the 200 diff, you might also need a spacer for the flange on the rear diff. I bought a flange for the rear diff on the softdash and this was long enougth think it depends on what year flange you get hold of.
The d2 is a non greaseable prop so when this eventually dies I'll be on the phone to the propshaft clinic, the one on the range rover came from there, not cheap but a fantastic bit of kit and grease nipples everywhere.
Have fun.
Jo