of rigid spaced apart parallel hangers 146 a 146 b 146 c 146 d and 146 e each in a plane perpendicular to an axis of front sheaves of a crown block assembly described below hangers 146 a 146 b support between them an axle 147 a for traveling block sheave 155 a hangers 146 b 146 b support between them an axle 147 b for traveling block sheave 155 b hangers 146 c 146 d support between them an axle 147 c for traveling block sheave 155 c and hangers 146 d 146 e support between them an axle 147 d for traveling block sheave 155 d each sheave axle 147 a 147 b 147 c and 147 d is parallel to the plane of the axis of the front sheaves of the crown block assembly traveling block sheaves 155 a 155 b 155 c 155 d rotate in traveling block frame respectively on axles 147 a 147 b 147 c and 147 d fig2 a is an illustration of the top drive 150 in the top drive fixture 151 of the completion system of one possible embodiment of the present invention the top drive comprises the top drive fixture 151 in conjunction with the drive mechanism 160 the drive mechanism 160 is moveably engaged with the guide frames 152 a 152 b and.