Land Rover Repair: 2000 LR Disc 11 V8 ES - Vibration, u bolts, prop shafts

Question
My 2000 LR Disc 11 V8 Es, has a vibration between 120 & 140kmph. Front & rear prop shafts have being replaced in full, transfer case overhualed, all diff brackets, u-bolts and rubbers checked. What could cause this?
Thanks from South Africa

Answer
Did you also look at tires and wheels?  Sometimes it's necessary to suspend the axles in the air and run the car at speed on a workshop lift to see what shakes.  I don't like doing that because it's dangerous, but there may be no other way to spot the vibration