For future reference, this is how I pull back the rear axle to replace a torque ball retainer. I use a ratcheting tie down meant for trailering. Use the bumper bracket, not the hole in the frame or you will rip the frame. I have done this in the past with the skinny tie downs that keeps plywood from flying out of your truck, but they are underpowered.
This is AFTER you have disconnected the shock links and rear sway bar at the rear, and the four bolts holding the front of the torque tube to the torque ball.
Then proceed with manual instructions.