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QA1

QA1 Rear Suspension Conversion Systems

4.53 out of 5 stars 19 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.

Showing In Stock Items. Show All 11 Items.

Results 1 - 11 of 11

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

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

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: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

...Loading

Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

...Loading

Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

...Loading

Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

...Loading

Estimated Ship Date: Feb 12, 2026 if ordered today

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

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

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: Feb 12, 2026 if ordered today

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Estimated Ship Date: Feb 12, 2026 if ordered today

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