Progressive Automotive, 4 Bar rear suspension, 4 Bar rear suspension kit, Coilover rear suspension

Triangulated 4-Bar Rear Suspension Kits and Parts

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Call (740) 862-4696 for your needs!

Our Triangulated 4-Bar kits come complete with lower bars, upper bars, all weld-on bracketry and mounting hardware. These bars are made from heavy wall, seamless 1" tubing, 3/16"wall thickness (not a bigger diameter tube with a thinner wall thickness) and include urethane bushings. Bars are TIG welded for strength and appearance.

This system eliminates the need for a panhard bar because the upper bars are designed at true 45 degrees. Anything more or less will allow your rear end to walk side to side. All bars have an adjustable end for allows easy adjustment and setting of the pinion angle. Frame rails must be boxed.

Specify make, model, & rear axle being used. For centered housing rear axles only. Will not work with rear axles that have cast centers (i.e. 12-bolt or 10-bolt G.M.)

Optional Parts

For rear boxing plates (add).....RS-BP..............$89.00

*For rear coil-over mounting crossmember and hardware (add).....PA-RCC..............$69.00

*Note: Rear crossmember is wide enough to weld to the inside of the frame rails on factory un-boxed frames.

For plain Aldan coil-overs, machined aluminum body/black springs (add)...PA-TRB-CO...$440.00/pr.

For Aldan coil-overs, polished aluminum body/black springs (add)...PA-TRB-COP...$525.00/pr.

For Air Ride Technologies single adjustable "Shockwaves"........................TRB-SWK-SA....add $845.00/pr.

For Air Ride Technologies double adjustable "Shockwaves"........................TRB-SWK-DA....add $1,115.00/pr.

For Air Ride Technologies single adjustable "Shockwaves" with Internal Ride Height sensor........................TRB-SWK-SI....add $1,205.00/pr.

For Air Ride Technologies single adjustable "Shockwaves" with Internal Ride Height sensor........................TRB-SWK-DI....add $1,475.00/pr.

For polished 304 Stainless bars, in place of steel bars (add).....TRB-UG-SS..............$460.00

For Gloss black powdercoated upper and lower bars, included media blasting for proper surface adhesion, (add)...TRB-UG-PCB.... $106.00

Polished Triangulated 4-bar kit shown in 1934-35 Standard Chevy chassis

Chevrolet:

1928-32 car & 31-33 truck...............TRB-CA........$405.00

1933 car................................................TRB-CB.........$405.00

1934-35 Standard car.......................TRB-CD.........$405.00

1934-35 Master car...........................TRB-CC.........$405.00

1936 Standard car..............................TRB-CE.........$405.00

1936 Master car..................................TRB-CF........$405.00

1937-39 car..........................................TRB-CG........$405.00

1941-48 car...........................................TRB-CI........$405.00

1955-57 car...........................................TRB-CJ........$405.00

1953-62 Corvette.................................TRB-CV........$405.00

1934-36 truck......................................TRB-CTB......$405.00

1937-40 truck......................................TRB-CTC......$405.00

1941-46 truck.......................................TRB-CTD.....$405.00

1947-55 (1st Series) truck................TRB-CTE.....$405.00

Triangulated 4-bar kit with PA-RCC and PA-TRB-CO shown in 1947-55 (1st Ser.) Chevy truck chassis

This Corvette is using our CV-TRB with PA-RCC and ADL-CO-R

304 Stainless Triangulated 4-bar kit with PA-RCC and PA-TRB-CO shown in 1953-62 Corvette chassis

Fords:

1928-31 Model A (Z'ed rear frames only)............TRB-FA........$405.00

1932 car & 1932-33 (1st Series) truck.............TRB-FB........$405.00

1933-34 car & 1933 (2nd Series)-34 truck.....TRB-FC........$405.00

1935-40 car & 1935-41 truck..............................TRB-FD.......$405.00

1941-48 Ford...........................................................TRB-FE........$405.00

Triangulated 4-bar kit with PA-RCC and PA-TRB-SW shown in 1941-48 Ford chassis

Plymouth & Dodge:

1933 Plymouth car (specify 108" or 112" Wheelbase) / 1933-35 (1st Ser.) Dodge truck..................TRB-PA-108........$405.00

1934 Plymouth car (specify 108" or 114" Wheelbase)..................TRB-PB........$405.00

1935-36 Plymouth car.............TRB-PC.......$405.00

Triangulated 4-bar kit with PA-RCC and PA-TRB-CO shown in Plymouth chassis

Willys:

1937-41 Willys car & truck......TRB-WA........$405.00

We also custom build our Triangulated 4-bar kits for vehicles other than Fords, Chevys & Plymouths that have full frames. Just fill out the Rear Tech sheet and send it to the address listed on the Home page!