Hi there I had this problem when changing the carrier bearings,when refitted had a nasty vibration,tryd turning the dampener which helped a bit but still there,in the end I changed again when I reconditioned my vcu myself and when refitted it was perfect,my conclusion was that my old vcu was so buggered that the fluid had stiffened up that bad it had caused a bad balance or I read on here that the prop shaft doesn’t really need to be aligned as iboth parts twist individually when on the freelander anyway,but one thing I did do different as well was when bolting up onto the rear diff is make sure both faces are clean and dust free and tighten the bolts in an opposite formation until tight and mines been mint since even after having to recon my over vcu that I had taken off mine due to sump bolts not sealing properly and leaking the vcu fluid,that’s when I found out that my original vcu was so stiff that I could barely turn it,hope this helps