Remove the original bumpstop attached to the framerail. Place the spacer against the framerail and attach the spacer and bumpstop with the provided bolts. Reinstall the rear wheels and lower the vehicle. Tighten the leaf springs' front pivot bolts and rear shackle bolts. When you're finished installing and tightening the components, drive the vehicle a block or so to let the lift kit settle. Adjust the torsion bars to level the vehicle. This will require patience and a bit of trial and error. Afterwards, have the front suspension realigned.