Hotchkis 1822 Rear Suspension Package, Adjustable, Dual Upper, 67-70 GM B Body - Manual (Page 10)

3) Unbolt the shock from the rear axle, and pull it clear of the mounting stud. Then remove the coil
spring retainer plate from the trailing arm. USE EXTREME CAUTION!
There will be nothing
holding the spring to the trailing arm except the weight of the vehicle.
4) Remove the springs. Only a trained technician should attempt this. The stock springs are
under a heavy stress load and can cause injury if removed improperly.
5) With the springs no longer loading the arms you may loosen and remove the hardware
attaching the arms to the body and axle. Only one arm should be removed and replaced at
one time to help maintain the alignment of the axle and for ease of replacement. Use a wrench
in the access hole at the front of the arm in the frame to reach the connecting hardware. You
may have to move the exhaust system to remove the bolt.
The hardware at the rear of the arm is easily accessed and should be removed. With all the
hardware removed the stock arm should drop out of place.