Energy Suspension Hyper-Flex Spring Shackle Bushing - Rear - Polyurethane/Steel - Black/Cadmium 931113 16 Fins Per Inch Core

16 Fins Per Inch Core -Allows more airflow to provide better cooling

5455 spring lock tool and the 5457 cam phaser limiter plug

Starting line control output with adjustable time release

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

1973-1974 GMC K15/K1500 Pickup

Energy Suspension Hyper-Flex Spring Shackle Bushing - Rear - Polyurethane/Steel - Black/Cadmium 931113 16 Fins Per Inch CoreProduct 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