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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.
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.
Showing In Stock Items. Show All 34 Items.
Summit Racing™ frame brace kits are designed to easily install and strengthen the factory frame of your classic car or truck. The benefit of stiffening the frame is improved handling and a tight predictable feel. Reinforce your chassis and create a custom pro touring style, corner carving ride with these Summit Racing™ frame brace kits. *Constructed From DOM tubing *Computer Designed, Machined, and Bent *Welding Required for most kits *Adjustable transmission crossmember for Manuals or overdrives included *Generous openings for Dual Exhaust pipe routing *Exhaust hangers provided
( 67 )
$199.99
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$1,249.99
Speedtech Performance USA frame brace kits prevent the sloppy, unpredictable feel of a weak body frame. You can increase rigidity by linking these braces to the strong structural undersides of your chassis. The braces are constructed from 1.5 in. DOM steel tubing that's computer designed, machined, and CNC-bent for consistent fitment. Speedtech Performance brace kits offer the reinforcement your race chassis demands.
( 10 )
$934.96
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$1,454.96
UMI Performance tubular front steering braces, also known as the Wonder Bars, are designed to tie the front right and left subframes together. UMI Performance tubular front steering braces bolt directly under the front sway bar, stiffening the front frame and resulting in improved handling, cornering, and overall performance. The steering braces strengthen the chassis, taking stress from the steering box area, which is well known as a weak area on any third-generation F-body. The steering braces are constructed from 0.250 in. 1018 mild steel CNC-machined mounting points and 1.250 in. DOM steel tubing with a 0.120 in. wall that is fully MIG-welded for extreme strength and lasting performance.
( 38 )
$99.99
UMI Performance front reinforcement braces reduce squeaks and rattles common with the GM G-body platform. This welded steel tubing will stiffen the front frame horns and front crossmember area, and no drilling is required for installation. Grade 8 hardware is included to easily bolt the triangular brace onto your chassis. UMI front reinforcement braces are designed and manufactured with pride, and are available in your choice of powdercoat colors.
( 12 )
$294.21
Reinforce your late-model Ford chassis with Steeda S550 Mustang rear IRS subframe support braces. These chromoly steel aftermarket stabilizers connect three key points on either side of the undercarriage: the rocker panel, the front mount of the rear suspension subframe, and the rear mount of the lower control arm. This adds much-needed rigidity and overall control of the vehicle. Steeda braces will limit twisting and vibrations for improved cornering, less wheel hop, and no additional noise. The stiffeners use existing holes in the chassis, and require no modifications—installation takes about an hour with regular shop tools. Leave the factory bracket in place; these subframe braces offer twice the support. Enjoy better handling and a safer ride with a pair of Steeda S550 Ford Mustang rear IRS subframe support braces.
( 11 )
$349.95
Stifflers Suspension web braces tie together their full-length subframe connectors and stiffening rails, creating the ultimate in chassis stiffening! A key component in their 1979-2004 modular FIT Systems, these individual black powdercoated steel frames provide a structurally engineered web network for additional strength and stiffness. Their installation is easy with the included Slide-2-Size mounting brackets. Stifflers Suspension web braces feature: * Slide-2-Size mounting; simply slide bracket into place and weld, for a custom fit every time * Design optimized using CAD/CAE software combined with real-world test data * Made of 1 in. x .065 in. tubing to maximize stiffness and strength while reducing weight * TIG-welded for superior strength * Considerably increased side impact safety * Works with any aftermarket square or rectangular full-length subframe connectors * Engineered for no loss of ground clearance and no need to relocate fuel or brake lines * No floors to cut or interior to remove * Pre-masked areas for welding require no removal of powdercoat before installation * Industrial-grade powdercoated for long life
( 2 )
$284.95
BMR Suspension IRS subframe support brace systems are designed for use with late model S550 Mustangs and compatible with stock bushings or BMR's popular cradle lock-out kit. This bracing adds additional rigidity to the independent-rear-suspension-to-chassis mounting, as well as additional reinforcement to the subframe itself. It achieves this by tying in to the front leg of the subframe where leverage is reduced. A super heavy-duty plate locks in beneath your sway bar mounts and gets tied into the rear bushing mount. Reinforce the weak points on your 6th generation Mustang for improved performance with a BMR Suspension IRS subframe support brace system. Features, items, and specs: * 4-piece independent rear suspension (IRS) bracing system * Reduces IRS movement and assembly deflection * Compatible with BMR and other IRS modifications/mounting solutions * Zero decrease in ground clearance * Extremely easy bolt-on installation * Reinforces critical areas of the IRS subframe by reducing leverage * High-quality hardware for installation included
Not Yet Reviewed
$239.95
Hotchkis Sport Suspension Convertible X Brace supports will add rigidity to your vehicle's chassis by replacing the factory frame brace. As an added benefit, they also allow for the use of larger-tube exhaust systems, which will often require the removal of the factory brace anyway. These fabrication-designed braces feature extra reinforcing gussets and a laser-cut HSS logo. Get your fabrication on with an assist from Hotchkis Sport Suspension Convertible X Brace supports!
( 16 )
$299.99
First and second generation F-bodies use a subframe that can flex during hard cornering, altering your suspension geometry and even your alignment. The problem solvers at Hotchkis offer Chassis Max handle bars as the solution. Triangular-shaped handle bars tie the control arms to each other or the cowl to the firewall with high-strength tubing, CNC-bent brackets, and laser-cut gussets (in first generation F-bodies) for maximum strength and rigidity. They are computer-designed for superior fit, fabricated from 1.5 in. steel tubing, TIG-welded for strength, and powdercoated with an anthracite finish for durability. Make the most of your high performance suspension and experience incredible handling and driver control in your street machine when you install Chassis Max handle bars from Hotchkis Sport Suspension.
( 16 )
$503.10
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$789.99
Stifflers Suspension Mustang FIT (Fully Integrated Technology) systems offer a proven way to keep your Mustang's muscles fit! The FIT system integrates the front and rear subframes and ties them into the rocker panels to form a triangulated web of strength and stiffness that helps keep your car in shape for improved handling, launches, and ride quality. The strong steel stiffeners beef up your Mustang for an increased range of suspension tuning and overall performance. Twisting and bending is good conditioning for humans--not vehicles. The best exercise for your Mustang is Stifflers FIT system. Stifflers Mustang Fit System benefits include: * Transfers more power to the ground, not wasting it twisting and bending the chassis * Launches straighter * Stiffer chassis reduces or eliminates interior rattles and extends the life of the vehicle * Weld locations are free of powdercoat--no removal of powdercoat required before installation * Non-intrusive design; no floors to cut, interior to remove, or lines to relocate * Tube ends are sealed to keep out moisture * Ground clearance remains unchanged * Increases side impact safety * Can be used with factory convertible braces with only slight modifications
( 3 )
$354.95
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$569.95
Whoa--strength and style! Kentrol strut rod kits will hold up your hood with beautiful stainless steel. No worries here about working under your hood when it's propped up with these strong rods. Be confident when you lift your Jeep hood supported by Kentrol strut rod kits.
( 1 )
$57.99
The 3rd Gen Camaro and Firebird are known for having a weak and flexible steering box area. To address flex and improve handling, a steering brace, also known as the Wonder Bar from QA1, is available. These tubular components bolt directly above the front sway bar, tying the front subframes together. Installing a QA1 Wonder Bar helps stiffen the front frame, reducing stress on this weak point. This translates to improved steering response to your vehicle with benefits like sharper handling, improved cornering, and overall better vehicle performance. Features and benefits: * Tubular construction strengthens the front chassis * Thoughtful design—the QA1 Wonder Bar installs cleanly between the sway bar and frame rails, maintaining a factory appearance without compromising ground clearance * Bolt-in installation makes the upgrade hassle-free Fitment Notes: Please be aware that 1982-1984 cars may need to slot existing mounting holes.
Not Yet Reviewed
$104.95
RideTech frame braces increase the structural rigidity of your truck or SUV by triangulating the original frame rails and crossmember. These steel reinforcements are powdercoated black to resist the elements, and are available for a wide range of applications. Order a pair to stiffen the chassis and improve the handling on your vehicle.
( 2 )
$335.00
Stifflers Suspension stiffening rails are more than just a place to put your jack. Installed behind the rocker panel pinch-weld lip, these multi-taskers add strength and stiffness to your Mustang's chassis, as well as provide a safe and solid foundation for your jack. They are manufactured of 1 in. x 1.5 in. x .083 in. rectangular tubing for great strength-to-weight ratio for improved handling. Stifflers Suspension stiffening rails feature pre-masked areas for welding; this means no powdercoat to grind away, so the installation is quick and easy. They are a must for all track and lowered cars. Stifflers stiffening rails also feature: * Plastic end plugs to help keep moisture out * Industrial-grade powdercoat for long life, to outlast the vehicle * Added level of safety in event of side impact * Can be used alone or with Stifflers' Fully Integrated Technology (FIT) system
( 4 )
$94.95
BMR Suspension cradle chassis braces provide an affordable way to lessen wheel hop and cradle movement on your vehicle. These lightweight, 100 percent bolt-on "stiffeners" use existing bolt holes and supplied hardware, allowing for easy installation with simple hand tools. Once installed, the steel braces greatly reduce cradle deflection. BMR cradle braces are offered in various powdercoat finishes for long-lasting good looks and service life. Available individually or in pairs, choose the braces designed for fitment on your vehicle application.
( 4 )
$149.95
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$229.95
Heidts chassis stiffeners are designed to strengthen the unibody and improve ride quality. These heavy-duty steel braces are completely bolt-in, with no cutting required. Hardware is included.
( 5 )
$426.00
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$1,410.00
On Sale
Steeda's 3-point torque box and frame rail braces are made from 4130 chromoly material. These Steeda braces tie together the inner and outer frame rails and the rear lower control arm mount. The braces are silver powdercoated and come with mounting hardware.
( 1 )
$354.95
$319.99
On Sale
Steeda Ford Mustang rear chassis X-braces reduce deflection and improve your suspension performance. They're crafted in-house from strong chromoly alloy steel tubing, then further reinforced with a billet aluminum center cover plate. The X-braces are powdercoated to resist the elements and provide long-lasting rigidity to your undercarriage. These units distribute loads more efficiently between your rear shocks, springs and the chassis—providing increased handling and cornering, while curbing rattles and squeaks. Most—but not all—models require a rear seat delete, and you can secure the braces easily with either a bolt-on or welded installation. Order the Steeda rear chassis X-brace designed for fitment on your Ford Mustang submodel.
( 4 )
$284.95
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$354.95
$256.99
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$331.99
BMR steel chassis steering braces are designed to tighten the front subframe assembly of your Camaro or Firebird and strengthen the steering box mounting area. They're an absolute must for any third generation F-body! BMR's steering braces will improve your steering response and handling. They come available in a black hammertone or red powdercoated finish.
( 2 )
$59.95
It's a known fact; during acceleration, cornering, and braking your chassis will flex and twist. The more power you add or the stiffer the suspension, the worse it becomes. All this movement uses up valuable horsepower, decreases handling characteristics, and reduces ride quality. So why spend time and money improving your engine and suspension when it's attached to a flaccid frame? Stifflers Suspension F-150 chassis stiffening systems bridge the front and rear sections of the F-150 frame to significantly increase its stiffness and reduce the twisting and bending caused by suspension inputs and drivetrain torque. The systems are designed for ease of installation with minimal drilling--all other mounting locations use existing holes. Stifflers F-150 chassis stiffening systems are complete with integrated brackets for optional driveshaft safety loops (sold separately). So what does this mean for you? * Straighter launches * Less wasted horsepower * More responsive suspension tuning * Improved handling under cornering and braking * Better ride quality * Fewer squeaks and rattles NOTE: Other manufacturers' long bars cannot be used with these systems.
Not Yet Reviewed
$549.95
On Sale
Whiteline chassis braces upgrade your car's performance. Your stock brace is merely stamped lightweight steel, but Whiteline rear chassis braces are heavy-duty boxed steel reinforcements. The stiffeners are designed to assist in absorbing load and reducing the force on the panhard. Reduce stress and increase performance with the addition of Whiteline chassis braces. Order the model tailored for your vehicle application.
Not Yet Reviewed
$96.88
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$183.88
$67.82
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$128.72
Stifflers Suspension lower chassis braces dramatically increase the strength and stiffness of the front chassis area. Available for both factory and aftermarket K-members, this additional stiffness minimizes flexing to help maintain correct front suspension geometry while under load. The result is tighter steering response and more predictable handling under cornering and braking. Where applicable, Stifflers' lower chassis braces can be combined with their Spider braces (sold separately) to completely integrate the front and rear chassis sections for unprecedented car control. Features include: * Manufactured from high-strength tubing to maximize stiffness and strength while reducing weight * Design optimized using CAD/CAE software combined with real-world test data * Industrial-grade powdercoated for long life * Select models available that will work with aftermarket long tube headers * Includes hardware and rod ends (where applicable) * Depending on application, welding and drilling may be required
( 2 )
$119.95
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$189.95
Give weak front-ends the boot with Rough Country Kicker Bars. Designed to work with Rough Country's suspension lifts, these reinforcement braces are fabricated from steel to help increase your vehicle's off-road stability, and are highly recommended by Rough Country for aggressive off-road use. Select the Kicker Bar kit designed for your truck.
Not Yet Reviewed
$89.95
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$129.95
On Sale
The revolutionary G-Trac bars were developed by Steeda's SCCA road race team to stiffen the Fox body K-member and maintain proper suspension geometry in max-G cornering. Steeda manufactures these Trac bars from quality materials to ensure performance and durability. They include all hardware and instructions.
( 1 )
$74.95
$67.99
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