When installing a leveling kit you will need to remove the torsion keys from the torsion bars. This can be quite the challenge. take some tips and tricks from these videos with you, to help this project go smoothly.
General info
Removal and replacement of torsion keys on the 2000 Z71.
This tool is needed to unload the torsion keys to safely remove them. Cheaper than the one offered at rough country it will help get the job done on a budget.
This video offers tips on how to remove the torsion keys while they are rusted stuck.
With the keys you already have you can crank them down to add lift.
This video will help with tricks when the torsion bars are stuck.