I recently replaced my air ride with the Atlantic British shock conversion, while I was down there, I replaced the lower control arms/bushing, tie rods, ball joints and sway arm bushings, and its rides great, land rover did the front end alignment was quite happy, but now when I'm going down hill or up hill and do a left hand turn and the suspension is compressed more than normal it vibrates like a tire is off balance or somethings rubbing, its a 2006 Lr3 with lr4 rims the tires on the rims were 245's and when I put new tires I went with the spec 255's I thought the wider tire might be hitting but I do not see and rub marks, Any ideas on what it might be? any help would be appreciated. kinda stumped on this all I can think of is wheel bearing to front drive shaft might be bad, I did not replace the sway arm link but it looked ok

 

It seems like you are on track, the wheel bearings front or rear, CV Joints, drive shafts and diffs would be the most likely culprits.