Energy Suspension Hyper-Flex Spring Shackle Bushing - Rear - Polyurethane/Steel - Black/Cadmium 931113 They are upgradeable to adjustable

They are upgradeable to adjustable shafts and can be converted to a coilover (kit sold separately)

Threaded Insert Tool Kit

Starting line control output with adjustable time release

1973-1974 GMC K15/K1500 Pickup

Energy Suspension Hyper-Flex Spring Shackle Bushing - Rear - Polyurethane/Steel - Black/Cadmium 931113 They are upgradeable to adjustableProduct Description: Spring Shackle Bushing Hyper Flex Rear Polyurethane Steel Black Cadmium GM Fullsize Truck 1973 87 Energy Suspension is the world's leader in developing and manufacturing performance polyurethane automotive suspension products. Energy Suspension state of the art on site new product development program which carefully analyzes various vehicle reactions equipped with Energy Suspension Performance Polyurethane technology. Energy