1963-72 Chevy Pickup Rear Back Half Kit, Level 3 Airbag


The Dropmember Rear Back Half suspension system is engineered to lay frame with a 15" wide wheel.
Level 3, Extreme
Ride height measures approx. 5” when running a 30” tall tire, and the frame will rest on the ground when deflated.



1963-72 Dropmember Back Half Level 3 Airbag

The Rear Level 3 Back Half Dropmember is a modular suspension system designed to replace the factory components and improve ride quality, performance, aesthetics, and strength. It is available in an inboard 4-link configuration allowing the use of a 15" wide wheel. Ride height measures approx. 4” when running a 30” tall tire, and the frame will rest on the ground when deflated (measurements are taken from bottom of the frame rail under the cab to the ground).

This kit can also be used to convert from a long bed to a short bed.

Designed to be paired with our Dropmember Level 3 Front.

Basic Kit Includes:

  • - In-board 4-link and 4-link crossmember
  • - Carrier bearing crossmember
  • - Modular bolt-in notch assembly
  • - Bolt-in bridge assembly
  • - Rear frame rail section
  • - Rear frame crossmember
  • - Lower bag mounting brackets
  • - Watts link

All rear kits are compatible with both long and short bed trucks.

Does NOT come powdercoated. All parts come raw.

Options & Upgrades

Porterbuilt Inner Frame Stiffener

Porterbuilt boxed inner frame stiifener provides additional strength and support for your truck. The Back Half specific Inner Frame Stiffener sports a shorter design that includes an adjustabel transmission mounting bracket. .

The Inner Frame Stiffener is built using 3/16" steel and includes the necessary grade 8 hardware for installation.


Firestone F9000 Air Spring Kit - This standard Firestone air spring offers maximum load support and operates at up to 100 psi. The spring has a 1/4" inflation port, a ride height of 8.25" and a maximum diameter of 5.70".

Shock Kits

KYB Excel-G gas shocks and struts rely on velocity-sensitive valving to respond to changing road conditions for a smooth, comfortable ride. They feature sintered-iron pistons and guide rods for strength, hard-chrome piston rods for added durability, and seamless cylinders and eyerings that eliminate the typical weak points. Excel-G shocks and struts also have a patented check valve to minimize foaming and aeration and maintain control under tough conditions.

Ridetech HQ Series Shocks - The HQ (handling quality) Series shocks adds rebound adjustment for the driver who wants to tune ride quality AND handling quality to their specific taste. A wide rebound adjustment range allows you to cruise down the road in plush comfort or firm up your suspension for those Saturday morning canyon roads!

More Information
Manufacturer PB Fab
Make Chevy / GMC
Year 1963-66, 1967-72
Model C10
Build time Typical Production Time is 4-5 weeks
Instructions Please email tech@pbfab.com for installation instructions.
CA PROP 65 WARNING CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov