I have a 2001 disco 2 and have had horable vibrating at different speeds and when i am increasing speed on decreasing. I have a 100000 mile warrenty and every time i take it in they replace the front drive shaft
and it gets better but always returns. any Idea or different u joints that I could replace it with

 

Go back and tell them they need to really fix it instead of just treating it. There's a reason the driveshafts are failing.