Triangulated 4-bar Rear Suspension by Progressive Automotive

Progressive Automotive Triangulated 4-bar supension with Ride Tech HQ coil-overs & Wilwood brakes
Progressive Automotive Triangulated 4-bar suspension with Ride Tech HQ coil-overs & Wilwood brakes

Progressive Automotive’s Triangulated 4 bar rear suspensions bars are made from heavy wall, seamless tubing, ensuring strength and durability. The bars are TIG welded for both structural integrity and a visually appealing appearance. All bars feature an adjustable end, allowing for easy adjustment. This feature enables you to fine-tune the suspension for alignment and pinion angle. Ride heights can be custom tailored to you taste during your installation. Frame rails must be boxed for bracket attachment points.

We can custom build for non-stock frames and most vehicles not listed. Inquire for details.

The kit are designed for steel housing rear ends, such as 8″ and 9″ Ford and 8 3/4 Chrysler rear ends, where steel brackets can be welded to a steel housing. These kits are not designed for Dana style (cast housing) rear ends. See our Parallel 4-bar for Dana style rear ends.

Specify either urethane bushings or Ride Tech R-Joints.

-Urethane Bushings Facts:  Urethane bushings provide controlled movement, vibration isolation, and durability. Articulation is limited.

-R-joints: R-Joints offers low friction movement, allowing for smooth and effortless articulation and durability. This feature enhances the overall ride, performance and handling of the suspension system.

Progressive Automotive takes pride in manufacturing their products at their shop in Baltimore, Ohio, U.S.A. emphasizing their commitment to quality and craftsmanship.

All Triangulated 4-bar kits include:  (2) Upper bars, (2) Lower bars, (4) Upper bar rear axle mounts with hardware, (2) Upper bar frame mounts with hardware, (2) Lower bar rear axle mounts with hardware, (4) Lower bar frame mounts with hardware & (2) Lower coil-over/ShockWave mounts with hardware.

Triangulated 4-bar with optional R-Joints
Triangulated 4-bar with R-Joints

Upper mounting crossmembers, Sway Bars, Coil-overs, and Air Ride parts are listed at the bottom of this page

Universal Kit     Includes long upper bars. Cutting & tapping required

          with Urethane bushings   TRB-U              $459

          with R-joints                     TRB-U-R          $699

 

Chevrolet Cars

1928-32 car/1931-33 truck

          with Urethane bushings   TRB-CA              $459

          with R-joints                     TRB-CA-R          $699

  

1933 Master & Standard car

          with Urethane bushings   TRB-CB              $459

          with R-joints                     TRB-CB-R          $699

  

  1934 Master car

          with Urethane bushings   TRB-CC              $459

          with R-joints                     TRB-CC-R          $699

 

  1934-35 Standard car
          with Urethane bushings   TRB-CD              $459

          with R-joints                     TRB-CD-R          $699

  

   1935 Master car/1936 Standard car

          with Urethane bushings   TRB-CE              $459

          with R-joints                     TRB-CE-R          $699

  

   1936 Master car

          with Urethane bushings   TRB-CF              $459

          with R-joints                     TRB-CF-R          $699

  

*1937-39 car

          with Urethane bushings   TRB-CG              $459

          with R-joints                     TRB-CG-R          $699

          *Recommended (4) 7″ Top Hat Frame re-enforcement plates can be found here

  

*1940-48 car

          with Urethane bushings   TRB-CI              $459

          with R-joints                     TRB-CI-R          $699

          *Recommended (4) 7″ Top Hat Frame re-enforcement plates can be found here

  

*1949-54 car

          with Urethane bushings   TRB-CH              $459

          with R-joints                     TRB-CH-R          $699

          *Recommended (4) 7″ Top Hat Frame re-enforcement plates can be found here

  

   1955-57 car

          with Urethane bushings   TRB-CJ              $459

          with R-joints                     TRB-CJ-R          $699

  

   1953-62 Corvette

          with Urethane bushings   TRB-CV              $459

          with R-joints                     TRB-CV-R          $699

 

 

Chevrolet/G.M.C. Trucks

   1934-36 Truck

          with Urethane bushings   TRB-CTB              $459

          with R-joints                     TRB-CTB-R          $699

  

   1937-40 Truck

          with Urethane bushings   TRB-CTC              $459

          with R-joints                     TRB-CTC-R          $699

  

   1941-46 Truck

          with Urethane bushings   TRB-CTD              $459

          with R-joints                     TRB-CTD-R          $699

  

   1947-55 (1st Ser.) Truck

          with Urethane bushings   TRB-CTE              $459
          with R-joints                     TRB-CTE-R          $699

  

   For 1955 (2nd Ser.) -up Chevy trucks, see our Parallel 4-bar suspensions

Chevrolet 1934-35 Standard Car Triangulated 4-Bar Suspension
TRB-CD shown with additional parts
TRB-CV shown with additional parts
TRB-CV shown with additional parts
TRB-CTD shown with Ride Tech coil-overs & additional parts
TRB-CTD shown with Ride Tech coil-overs & additional parts
TRB-CTB shown with rear sway bar and additional parts
TRB-CTB shown with rear sway bar and additional parts
TRB-CTC shown with Ride Tech ShockWaves & additional parts
TRB-CTC shown with Ride Tech ShockWaves & additional parts

Ford Cars & Trucks

          1932 car/1932-33 (1st Ser.) Truck

          with Urethane bushings   TRB-FB              $459

          with R-joints                     TRB-FB-R          $699

  

          1933-34 car/1933 (2nd Ser.)-34 Truck

          with Urethane bushings   TRB-FC              $459

          with R-joints                     TRB-FC-R          $699

  

          1935-40 car/1935-41 Truck

          with Urethane bushings   TRB-FD              $459

          with R-joints                     TRB-FD-R          $699

  

          1941-48 car

          with Urethane bushings   TRB-FE              $459

          with R-joints                     TRB-FE-R          $699

  

           *For 1942-up Ford trucks, see our Parallel 4-bar suspensions

TRB-FD shown with Ride Tech HQ coil-overs and additional parts
TRB-FD shown with Ride Tech HQ coil-overs and additional parts
TRB-FE shown with Ride Tech HQ coil-overs, rear sway bar and additional parts

Mercury Cars

          1941-48 Mercury car

          with Urethane bushings   TRB-ME              $459

          with R-joints                     TRB-ME-R          $699

  

Mopar Cars & Trucks

*Note, Specify Wheelbase   

    *1933 Plymouth (108”/112” WB) car/1933-35 (1st Ser.) Dodge Truck

          with Urethane bushings   TRB-PA              $459

          with R-joints                     TRB-PA-R          $699

  

    *1934 Plymouth (108”/114” WB) car

          with Urethane bushings   TRB-PB              $459

          with R-joints                     TRB-PB-R          $699

TRB-PA shown with additional parts
TRB-PA shown with additional parts

Willys Cars & Trucks

          1937-41 car/1937-41 Truck

          with Urethane bushings   TRB-WA              $459

          with R-joints                     TRB-WA-R          $699

 

Additional & Optional Parts

Boxing Plates for C-channel style frame rails can be found here:

Progressive Automotive Rear Sway Bar kit                      PA-RSB-1            $345

Progressive Automotive PA-RSB-1 rear sway bar shown
Progressive Automotive PA-RSB-1 rear sway bar shown
Progressive Automotive PA-RSB-1 rear sway bar shown
Progressive Automotive PA-RSB-1 rear sway bar shown

Rear Coil-over/Shockwave Upper mounting crossmember              PA-RCC               $119

*Recommended for Top Hat frames, add (2) 7″ Top Hat Frame re-enforcement plates

  

1955-57 Chevy/1953-62 Corvette Upper Coil-over/Shockwave mounts    TRB-CO-CJCV     $59

  

Ride Tech Coil-Overs

*More information on these can be found on our Ride Tech Coil-over & Shockwave page

             HQ coil-overs, rebound adjustable                        TRB-CO-HQ            $860

          

Ride Tech HQ Coil-overs
Ride Tech HQ Coil-overs

 

Ride Tech Shockwaves for Air suspension

*More information on these can be found on our Ride Tech Coil-over & Shockwave page

             HQ ShockWaves, rebound adjustable                        TRB-SKW-HQ            $945

    

Ride Tech HQ Rear Shockwaves for air ride shown
Ride Tech HQ Rear Shockwaves for air ride shown

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