Vibrations at 50mph upwards

Hi Folks.
I have a 2005 TD4. For the past week or so I've noticed alot of vibration coming through the car in 4th and 5th at about 50 mph upwards. Its worse on acceleration, less noticeable with little throttle and not there once clutch pedal is down.Its seems ok at lower back road speeds
It has had a recent clutch change but was running smoothly since the change. Any thoughts on where i should look first

Cheers Mike

Check all the engine mounts and tie bars are bolted up tight. Sometimes the onboard CV joints can cause vibration on acceleration.

I had the same problem just after Christmas. Turned out the FL driveshaft had sheared and it was close to going through the gear box. Get it checked out ASAP to be on the safe side.

Is your prop attached?
How much mileage has it done?

Thanks fro the responses guys. I was away and didn't see them till now. Freelander has been mostly parked since then.
Prop is attached, mileage is about 110k. Its strange that i almost imagine that it comes and goes as well.
I still suspect the drivetrain. But i have a slight suspicion on the engine as well. is is feasible that a very bad injector could cause this as it is very power related and i also have a very lumpy idle..
Cheers
Mike

I had similar symptoms (really low-down rumble coming in at about 50, going at about 55, then noticeable again at 70, so bloody annoying), which stayed when depressing the clutch, so clearly something drive train or maybe wheel-bearing related. Thought it might be VCU, so swapped front (newer) and rear tyres (checking for sloppy w/bearings while on the jack ... nothing) ... miracle cure. Totally gone. Expense spared!

Most likely front offside inner CV joint, but could be any of the 4. If its a bit dry it comes and goes. Check for rotational play and any splits in the boot

Thanks for the pointers guys. The drivers side front inner CV and boot is knackered.