its not a friction thing. EVERY single newer xj i have ever driven, in the years of detailing and servicing customers vehicles, seems to have made this unique sound. I will try to find a way to record it. i figured it was just the way they are. hoped to eliminate it. its not power steering. steering plays no part in the sound. i thought it may be the electric fan, or the way the intake sings. i dont know how to better describe it since they all do it. kind of a high pitched sound. it increases with acceleration. nothing that sounds broken, damaged, or old. WB9YZU, that would be the best way to describe the effect, I just find it hard to believe the ALL do it. I will check the clutch when I get home.
and although I think it could use some rotation driveline components, the sound comes from the very front of the XJ.
I will let you know my findings, thank you everyone