Abstract: In a center bearing and support mechanism for a two-piece propeller shaft, a center bearing surrounded by an insulator is supported at one of axially separated portions thereof on a frame of a vehicle chassis and at the other of the axially separated portions on a vehicle body so that vibrations of the propeller shaft are transferred through two paths to the vehicle body to be counterbalanced.

Abstract: A splined, two-piece propellor shaft with radial clearance between the inner and outer splined members which permits them to move radially relative to each other in which an asymmetrical weight distribution around the circumference of at least one of the members is provided on either or both of the inner and outer members to generate a centrifugal force upon rotation of the propellor shaft which causes predetermined portions of the members to move radially into tight engagement with each other so that the splined sections consistently assume the same radial relation during rotation.