QA1 Rear Suspension Conversion Systems

4.71 out of 5 stars 17 Customer Reviews

QA1 rear suspension conversion systems provide easy, bolt-in options to replace your coil springs on factory truck arms—without any cutting, welding, or other fabricating. Each kit contains frame brackets, axle brackets, linkage assemblies, a crossmember assembly, and necessary hardware. The conversions are available with coilovers or available for use with the factory springs. Order the model designed for fitment on your specific vehicle, and enjoy the stance, handling, and suspension performance of a revolutionary QA1 system.

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QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R221-200

Rear Coilover Conversion System, Double Adjustable, 200 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R221-200

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R221-250

Rear Coilover Conversion System, Double Adjustable, 250 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R221-250

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems R121-200

Rear Coilover Conversion System, Single Adjustable, 200 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R121-200

Not Yet Reviewed

Estimated Ship Date: Today

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Estimated Ship Date: Today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R222-200

Rear Coilover Conversion System, Double Adjustable, 200 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R222-200

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R122-170

Rear Coilover Conversion System, Single Adjustable, 170 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R122-170

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R122-200

Rear Coilover Conversion System, Single Adjustable, 200 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R122-200

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R121-170

Rear Coilover Conversion System, Single Adjustable, 170 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R121-170

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R121-250

Rear Coilover Conversion System, Single Adjustable, 250 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R121-250

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R122-250

Rear Coilover Conversion System, Single Adjustable, 250 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R122-250

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1999-2006 SIERRA 1500, SILVERADO 1500 - R145-200

Rear Suspension System, Adjustable, Single Adjustable Coilover, 200 lbs./in., Torque Arm, Panhard Bar, GM 10-Bolt, Short Bed, Chevy, GMC, Kit

Part Number: QA1-R145-200

Not Yet Reviewed

Estimated Ship Date: Dec 5, 2025 if ordered today

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Estimated Ship Date: Dec 5, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1999-2006 SIERRA 1500, SILVERADO 1500 - R146-200

Rear Suspension System, Adjustable, Single Adjustable Coilover, 200 lbs./in., Torque Arm, Panhard Bar, GM 10-Bolt, Long Bed, Chevy, GMC, Kit

Part Number: QA1-R146-200

Not Yet Reviewed

Estimated Ship Date: Dec 5, 2025 if ordered today

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Estimated Ship Date: Dec 5, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R221-170

Rear Coilover Conversion System, Double Adjustable, 170 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R221-170

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R222-170

Rear Coilover Conversion System, Double Adjustable, 170 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R222-170

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1973-1979 F-100, 1975-1979 F-150 - R222-250

Rear Coilover Conversion System, Double Adjustable, 250 lbs./in. Spring Rate, Ford, Kit

Part Number: QA1-R222-250

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1999-2006 SIERRA 1500, SILVERADO 1500 - R245-200

Rear Suspension System, Adjustable, Double Adjustable Coilover, 200 lbs./in., Torque Arm, Panhard Bar, GM 10-Bolt, Short Bed, Chevy, GMC, Kit

Part Number: QA1-R245-200

Not Yet Reviewed

Estimated Ship Date: Dec 5, 2025 if ordered today

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Estimated Ship Date: Dec 5, 2025 if ordered today

QA1 Rear Suspension Conversion Systems for 1999-2006 SIERRA 1500, SILVERADO 1500 - R246-200

Rear Suspension System, Adjustable, Double Adjustable Coilover, 200 lbs./in., Torque Arm, Panhard Bar, GM 10-Bolt, Long Bed, Chevy, GMC, Kit

Part Number: QA1-R246-200

Not Yet Reviewed

Estimated Ship Date: Dec 5, 2025 if ordered today

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Estimated Ship Date: Dec 5, 2025 if ordered today

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