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Chassis Stiffeners

Whether it has body-on-frame or unibody construction, your vehicle came from the factory with a chassis designed to flex. Engineers made it this way so that it could...

Whether it has body-on-frame or unibody construction, your vehicle came from the factory with a chassis designed to flex. Engineers made it this way so that it could absorb all the bumps of daily driving while keeping the driver and passengers safe and comfortable.

However, when you’re converting a street vehicle into a racing vehicle, that flexibility becomes a liability. The massive torque of drag racing engines can twist the frame so much that one of the front wheels can lift off the ground, causing a dangerous loss of control, and chassis flex also loosens your handling on road courses and autocross tracks.

Chassis...

Whether it has body-on-frame or unibody construction, your vehicle came from the factory with a chassis designed to flex. Engineers made it this way so that it could absorb all the bumps of daily driving while keeping the driver and passengers safe and comfortable.

However, when you’re converting a street vehicle into a racing vehicle, that flexibility becomes a liability. The massive torque of drag racing engines can twist the frame so much that one of the front wheels can lift off the ground, causing a dangerous loss of control, and chassis flex also loosens your handling on road courses and autocross tracks.

Chassis stiffening kits and components reinforce your chassis to make it more rigid. On a unibody vehicle, they usually include connectors to tie the front and rear subframes together. For body-on-frame vehicles, they include braces to tie the sides together, and/or boxing components to close up the channels in the frame rails. Additional components vary by application, manufacturer, and degree of stiffness required.

Top Brands

Summit Racing Equipment has been helping racers and hot rodders meet their performance goals since 1968, so we know all of the ins and outs of a chassis stiffening project. When you’re ready to hit the track, choose parts from brands you can trust, like Hotchkis Sport Suspension, RideTech, Heidts, UMI Performance, BMR Suspension, Stifflers Suspension, and more.

Individual Parts

Results 1 - 25 of 123

Frame Brace, Chassis Stiffening, Steel, Natural, 68-72 Chevelle, GM A-body, Buick, Chevy, Oldsmobile, Pontiac, Kit

Part Number: SUM-770800

4.73 out of 5 stars ( 15 )

Estimated Ship Date: Today

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Frame Brace, Chassis Stiffening, Steel, Natural, 64-67 GM A-Body, Weld In, Kit

Part Number: SUM-770830

3.7 out of 5 stars ( 10 )

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Frame Brace, Chassis Stiffening, Steel, Natural, Weld In, Tri-Five, Kit

Part Number: SUM-770810

4.05 out of 5 stars ( 19 )

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Chassis Stiffeners, Frame Brace Kits, Frame Position, Steel, Natural, Designed for A 2-door A-body, Buick, Chevrolet, Oldsmobile, Pontiac, Kit

Part Number: SDP-30710

3.0 out of 5 stars ( 7 )

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Subframe Braces, Rear IRS, Mustang, S550 Coupe Models, Chromoly, Silver Powdercoat, Chassis Stiffeners, Pair

Part Number: SDA-555-5754

5.0 out of 5 stars ( 10 )

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Frame Brace, Chassis Stiffening Kit, Steel, 63-72 C10, Long Bed, 127 in. Wheelbase, Bolt-In, Chevy, GMC, Kit

Part Number: SUM-770821

5.0 out of 5 stars ( 2 )

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Chassis Stiffeners, Front Reinforcement Braces, Front Lower Position, Steel, Black Powdercoated, Buick, Chevrolet, Oldsmobile, Pontiac, Each

Part Number: UPI-3053-B

5.0 out of 5 stars ( 7 )

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Chassis Stiffener, Frame Brace, Steel, Natural, Buick, Chevy, Oldsmobile, Pontiac, 2-Door, A-Body, Kit

Part Number: SDP-30709

3.67 out of 5 stars ( 3 )

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Chassis Stiffeners, Web Braces, Frame Position, Steel, Black Powdercoated, Ford, Set of 4

Part Number: IVP-WEB-M01

5.0 out of 5 stars ( 1 )

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Subframe Braces, Rear IRS, Steel, Red Powdercoat, Ford, Kit

Part Number: BMR-CB762R

Not Yet Reviewed

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Chassis Steering Brace, Front Lower, Steel, Black Powdercoated, Chevy, Pontiac, Each

Part Number: UPI-2030-R

4.84 out of 5 stars ( 25 )

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Chassis Steering Brace, Front Lower, Steel, Black Powdercoated, Chevy, Pontiac, Each

Part Number: UPI-2030-B

4.92 out of 5 stars ( 12 )

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Chassis Stiffeners, Front Reinforcement Braces, Front Lower Position, Steel, Red Powdercoated, Buick, Chevrolet, Oldsmobile, Pontiac, Each

Part Number: UPI-3053-R

5.0 out of 5 stars ( 4 )

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FRAME BRACE KIT

Part Number: SDP-60710

Not Yet Reviewed

Estimated Ship Date: May 12, 2025 if ordered today

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Estimated Ship Date: May 12, 2025 if ordered today

Frame Rail Brace, Steel, Black Powdercoated, Chevy, GMC, Pair

Part Number: ART-11369550

3.0 out of 5 stars ( 2 )

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Strut Rod, Radiator Core Support Brace, Front Upper, Stainless Steel, Natural, Jeep CJ, Sold as Pair

Part Number: KTL-30517

5.0 out of 5 stars ( 1 )

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Chassis Stiffener, FIT Stiffening System, Steel, Black Powdercoated, Mustang, Kit

Part Number: IVP-FIT-M01

5.0 out of 5 stars ( 1 )

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Chassis Stiffeners, Stiffening Rails, Frame Position, Steel, Black Powdercoated, Ford, Pair

Part Number: IVP-SR-M02

5.0 out of 5 stars ( 1 )

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Chassis Stiffener, Chassis Max X-Brace, Rear, Lower, with Hardware, Steel, Black Powdercoated, For Convertible Camaro/Firebird, Kit

Part Number: HSS-1404

4.94 out of 5 stars ( 16 )

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Chassis Stiffener, Wonder Bar, Steel, Black, Bolt-On, Chevy, Pontiac, Each

Part Number: QA1-52122

Not Yet Reviewed

Estimated Ship Date: Jun 9, 2025 if ordered today

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Estimated Ship Date: Jun 9, 2025 if ordered today

Chassis Stiffener, FIT Stiffening System, Steel, Black Powdercoated, Mustang, Kit

Part Number: IVP-FIT-M02

3.0 out of 5 stars ( 2 )

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Chassis Stiffeners, Mustang FIT System, Frame Position, Steel, Black Powdercoated, Ford, Kit

Part Number: IVP-FIT-M03

Not Yet Reviewed

Estimated Ship Date: May 27, 2025 if ordered today

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Estimated Ship Date: May 27, 2025 if ordered today

Chassis X-Brace, Rear, Chromoly, Silver Powdercoated, Requires Rear Seat Removal, Ford Mustang, Each

Part Number: SDA-555-5085

5.0 out of 5 stars ( 1 )

Estimated Ship Date: May 27, 2025 if ordered today

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Estimated Ship Date: May 27, 2025 if ordered today

Chassis brace, front reinforcement brace

Part Number: BMR-CB410H

Not Yet Reviewed

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