A downhole vibration assembly for transmitting a pressure pulse in a drill string above a drill bit having a positive displacement power section disposed in an inner bore of a housing, the positive displacement power section including a rotor disposed at least partially within a stator, wherein the rotor is operatively suspended within the inner bore of the housing to rotate within the stator upon a fluid flow through the positive displacement power section, the downhole vibration assembly characterized by: a valve disposed above the positive displacement power section within the inner bore of the housing, the valve including a rotating valve disc and a stationary valve disc each including at least one fluid passage (24, 26, 30, 32) extending axially therethrough, wherein the rotating valve disc is configured to rotate with a rotation of the rotor for cycling the valve between an open position and a restricted position, wherein in the open position the fluid passage (24, 26) of the rotating valve disc is aligned with the fluid passage (30, 32) of the stationary valve disc, wherein in the restricted position the fluid passage (24, 26) of the rotating valve disc is at least partially unaligned with the fluid passage (30, 32) of the stationary valve disc for restricting the fluid flow through the valve to generate and transmit an unobstructed pressure pulse through the drill string above the valve; a nut threadedly secured to a surface of the inner bore of the housing, wherein the nut is disposed above the stationary valve disc and abuts an upper surface of the stationary valve disc; and a compression sleeve disposed between the stationary valve disc and the surface of the inner bore of the housing, wherein the compression sleeve contacts the stationary valve disc, and wherein an upper end of the compression sleeve abuts the nut. a valve disposed above the positive displacement power section within the inner bore of the housing, the valve including a rotating valve disc and a stationary valve disc each including at least one fluid passage (24, 26, 30, 32) extending axially therethrough, wherein the rotating valve disc is configured to rotate with a rotation of the rotor for cycling the valve between an open position and a restricted position, wherein in the open position the fluid passage (24, 26) of the rotating valve disc is aligned with the fluid passage (30, 32) of the stationary valve disc, wherein in the restricted position the fluid passage (24, 26) of the rotating valve disc is at least partially unaligned with the fluid passage (30, 32) of the stationary valve disc for restricting the fluid flow through the valve to generate and transmit an unobstructed pressure pulse through the drill string above the valve; a nut threadedly secured to a surface of the inner bore of the housing, wherein the nut is disposed above the stationary valve disc and abuts an upper surface of the stationary valve disc; and a compression sleeve disposed between the stationary valve disc and the surface of the inner bore of the housing, wherein the compression sleeve contacts the stationary valve disc, and wherein an upper end of the compression sleeve abuts the nut.