Citroen C5 Driveshaft Problems

When driving hot or cold ,if I change gears manually. ie in tiptronic mode, too early there is avibration under load, or in full manual this can occurr.the car drives perfectly otherwise. I am 63 and a time seved mechanic,is it a gearbox b...

I bought the car just two months ago. When I test drove the car which had 25,000 miles on the clock, it had a strange rumbling noise from the front end which the salesman said was due to it having been standing on the forecourt for a while ...