$20 Off $250 / $40 Off $500 / $80 Off $1,000 - FINAL DAY! Use Promo Code: DEALS

$20 Off $250 /$40 Off $500 / $80 Off $1,000
FINAL DAY! Use Promo Code: DEALS

It's the Season for Savings - Shop Holiday Deals Now!

72 Results Found For "additives"

Part Groups

Results 1 - 24 of 72

Classic Performance Stock-Type Control Arms

Classic Performance stock-type control arms are precision-engineered to provide more than just a factory fit. Stamped from heavy-gauge steel, Classic Performance Parts control arms are factory-correct, painted or powdercoated for protection, and offer superior strength and durability compared to your old ones. Keep your classic ride at performing at its best with better-made Classic Performance stock-type control arms. Varying with application, they are offered with rubber or PolyPlus urethane bushings. Some control arms feature additional caster.

4.21 out of 5 stars ( 91 )

$399.99

$478.99

UMI Performance Transmission Mounted Torque Arms

UMI Performance transmission mounted torque arms eliminate unwanted traction problems and transfer your power to the wheels. UMI Performance transmission mounted torque arms bolt on directly in place of the factory unit using existing mounting holes and require no drilling or welding. These torque arms are designed to eliminate wheel hop under hard acceleration and reduce 60 ft. times instantly. UMI Performance transmission mounted torque arms are supplied with a low-deflection front bushing designed to replace the stock rubber bushing and bolt in the existing clamshell. The rear torque arm mount is constructed entirely of 0.375 in. thick, CNC-machined mild steel and is fully MIG-welded. These torque arms feature on-car adjustability for easy pinion angle adjustments using a 4140 heat-treated adjuster and 3/4 in. rod ends. Additional features include: * Constructed from 1.250 in. x 0.120 in. DOM seamless steel tubing * TIG-welded 4140 chromoly tube adapters * On-car adjuster built using 4140 chromoly steel and heat-treated for maximum strength * All mounting plates are CNC-machined to ensure hole-to-hole accuracy * Rear mounting plates use 0.375 in. thick mild steel and are designed to fit stock as well as 12-bolt and 9 in. rear-end housings * Rear mounts feature solid 3/4 in. rod ends and are attached using Grade 8 hardware * Durable powdercoated finish

4.84 out of 5 stars ( 19 )

$329.99

$339.99

Rhodes Race Cars Sportsman Series Wheelie Bars

Control wheel stands and put more power into moving the car forward. Get Rhodes Race Cars Sportsman Series wheelie bars for your vehicle today. Features and benefits: * Made from 1 1/8 in. diameter, .058 wall, 4130 chromoly tubing for the ultimate in strength * Main tubes come with TIG-welded wheel brackets installed * Wheel brackets are made from 4130 chromoly with a second hole to raise the wheelie bar for additional ground clearance during loading and unloading * Designed to be 70 in. from center of the rear end housing to center of the wheelie bar wheel * Comes complete with mild steel rod ends, pull pins, aluminum wheels, and all hardware necessary (welding required) * Welded kits available with lower section completely welded * Welded kits have upper bars with one threaded bung welded in; the second bung must be welded in once height has been established

4.33 out of 5 stars ( 6 )

$349.95

Summit Racing™ Lightweight Transmission Crossmembers

Strengthen your transmission support and reduce the weight of your vehicle with Summit Racing™ lightweight transmission crossmembers. Through advanced design and manufacturing, these crossmembers are stronger than standard boxed-steel transmission crossmembers, while weighing an average of 35-percent less. The crossmembers are a direct bolt-in and do not require any additional brackets or adapters to complete the installation. They also allow you to run a true dual-exhaust system with most popular GM transmissions and do not affect ground clearance. The welded design with clear powdercoat finish gives these lightweight crossmembers a fabricated look that's sure to complement your ride. Order the model recommended fit your application.

4.85 out of 5 stars ( 13 )

$299.99

$436.99

BMR K-Members

BMR Suspension K-members feature a unique tubular design that will allow you to drop the weight on your front-end by more than half of the factory piece. They provide a lightweight alternative, while offering larger tubing for durability. BMR K-members also provide more clearance for aftermarket headers and turbo systems. They will work with stock or aftermarket A-arms (except where noted), providing an additional 1/4 in. adjustment, equaling up to 4 more degrees of camber.

4.12 out of 5 stars ( 25 )

$369.95

$569.95

Icon Vehicle Dynamics Multi-Rate Leaf Spring Packs

Icon Vehicle Dynamics multi-rate leaf spring packs include an add-in-leaf to create systems that offer a major performance gain for most any truck setup, even those requiring more load-carrying capabilities. These user-adjustable multi-rate leaf packs feature tip inserts and leaf separators that lessen friction, reduce noise, and increase ride comfort, while military-wrapped eyelets improve the durability and strength of the leaf spring. To increase the ride quality of your truck and gain additional droop travel, the spring rate has been lowered slightly—and this is where the add-in-leaf works. For those who have outfitted their trucks with significant weighty additions, the additional leaf can be exchanged or added to the pack yielding an additional 10 percent or 40 percent spring rate (depending on kit). OE leaf springs can have limiting factors … especially with fully loaded rigs with racks, rooftop tents, and the like. Redefine the potential of your truck; adjust leaf spring rate to compensate for your specific truck setup, be it unloaded or fully loaded, with Icon multi-rate packs.

4.0 out of 5 stars ( 4 )

$341.14

$454.25

Alston Racing Bolt-On Subframe Connectors

Alston Racing bolt-on subframe connectors are carefully formed to fit the contour of your vehicle's stock unit body floor. No cutting or welding is required for installation, allowing you to retain your stock exhaust, fuel, and brake lines. In about four hours, you can preserve the consistency and performance of your uni-body chassis. Additional features of Alston Racing bolt-on subframe connectors include: * Easy installation * Complete with Grade 8 hardware and instructions * Powdercoated to ensure long life and good looks * Can also be welded in

4.17 out of 5 stars ( 24 )

$297.00

$356.00

Global West Suspension Subframe Connectors

The more improvements you do to the vehicle, the more demands are put on the body. These Global West subframe connectors provide additional support to increase the integrity of the chassis. They are a must for any performance application. They're built out of round 1 5/8 in. x .125 in. wall roll cage tubing. The construction attaches to the factory support rails located directly under the front seats. The rear portion of the subframe attaches to the rear leaf spring mount and frame rail. Additional gussets are included in the kit, which add support to the rear spring mount. Welding is required for installation.

4.7 out of 5 stars ( 97 )

$350.75

BMR Xtreme Torque Arms

Are you looking for a torque arm that will stand up to your 10.50 or lower ET? Look no further. BMR Suspension Xtreme torque arms are constructed from TIG-welded 4130 chromoly tubing to take the punishment of that 8, 9, or 10-second motor, BMR torque arms provide less wheel hop for stronger performance. Additional features: * Gusseted rear mounting bracket made from 3/8 in. laser-cut plate * Solid 4130 rod eyes * Reinforced front bushing mount * Additional cross bracing

4.65 out of 5 stars ( 34 )

$329.95

$529.95

Instant Rebate

MaxTrac Suspension Lowering Spindles

MaxTrac Suspension lowering spindles maintain the factory ride quality. They're designed by taking an OEM spindle and raising the wheel mounting position up, allowing the A-arms to keep the same angles as factory. MaxTrac Suspension spindles are offered in different materials, are simple to install, and retain all factory hardware. They're available for hundreds of applications from 1973 and up. Additional details: * 6082 T-6 aircraft grade aluminum or ductile iron construction * All necessary hardware * Easy bolt-on installation

4.56 out of 5 stars ( 9 )

$297.00

$498.80

UMI Performance Rear Control Arms and Panhard Bar Kits

UMI Performance Rear control arms and panhard bars are direct bolt-on replacements designed to minimize wheel hop and improve cornering and track consistency, while lowering ETs. The control arms are constructed from a DOM mild steel tubing 1.375 in. o.d. x 0.095 in. wall and are completely CNC-machined and fully TIG-welded for outstanding strength. The adjustable models feature spherical rod ends that allow for "bind-free" operation, making them great upgrades for both your track and autocross-driven vehicles. The Roto-Joint equipped models are designed to work like a spherical rod end while maintaining the qualities of a softer bushing. Roto-Joints feature a 4140 chromoly ball that rotates in a Delrin race. Additional features include: * Control arms are 1.375 in. x 0.095 in. mild steel tubing * 4130 chromoly threaded tube adapter (adjustable models only) * 3/4 in. hard chrome plated PTFE/KEVLAR® self-lubricating race rod end * TIG-welded construction * CNC-machined 6061 aluminum step bushings with zinc plated steel sleeves (where applicable) * Polyurethane greasable bushings * On car grease fittings (except rod ends) * Use OEM hardware

4.83 out of 5 stars ( 84 )

$379.99

Calvert Racing Parabolic Mono-Leaf Springs

Calvert Racing offers parabolic mono-leaf springs for a variety of applications, including 1955-57 Chevrolet Bel Air models. Parabolic spring design distributes stress along the length of the spring, reducing stress on the arch. Each spring pair is arch verified. Center pins and Delrin© bushings are included. These 2 in. wide springs are available in stock height, as well as +1 in. and 1-3 in. drop. Additional details: * Alternative for aftermarket spring * Substantially lighter than multi-leaf springs * Springs are designed for drag racing * Springs have a higher spring rate / stiffer ride than stock springs * Springs are dipped in black paint before assembly, but some raw steel may show due to deburring/grinding sharp edges

Not Yet Reviewed

$520.00

Competition Engineering Formed Rear Frame Rails

Competition Engineering formed rear frame rails adds some beef to your suspension. The "chassis people" have designed and manufactured these to replace the stock sheet metal rear rails in your subframe equipped car. CE's rails are mandrel-formed 2 in. x 3 in. x .083 in. wall mild steel tube that will increase the chassis strength for quicker vehicle reaction times. Plus, they have been engineered to move the leaf springs and frame rails inboard to provide additional tire clearance. Strengthen your suspension to put more power to the pavement utilizing a pair of Competition Engineering formed rear frame rails. Additional information: * Designed to fit stock floor contours with minor fabrication * Requires use of a fuel cell, rear fenderwells and an upper shock crossmember * Use with Competition Engineering weld-in subframe connectors * Two rails and hardware per kit

4.19 out of 5 stars ( 16 )

$416.99

$461.99

UMI Performance Bolt-On Tubular Subframe Connectors

UMI Performance tubular subframe connectors are designed to tie the front and rear subframes together using bolt-in hardware supplied and they require no welding! Subframe connectors improve your car's handling ability, while reducing T-top squeaks, dash rattles, and quarter panel flexing. They are designed for autocross, road racing, and drag racing setups. Connecting the front and rear subframes together allows for better weight transfer, improved traction, and straighter launches. Their setup tucks tightly against the floor using strong tubing, causes no ground clearance loss, and cannot be seen from the side of the vehicle. Additional features include: * Constructed from chromoly or mild steel tubing * Front mounting points feature 0.250 in. thick mild mounting plates * Mounting plates feature precision CNC-machining to ensure tolerances * Tubular design allows for a tighter fit against the vehicle's undercarriage * Uses rear control arm mount for increased strength and ensures proper installation * MIG-welded construction * Durable powdercoated finish

4.74 out of 5 stars ( 39 )

$340.38

$349.99

Old Man Emu Dakar Leaf Springs

Old Man Emu Dakar leaf springs are offered in numerous spring options to suit a multitude of applications, allowing you to set your vehicle up for recreational or commercial purposes. Feature packed, a set of Emu Dakar leaf springs matched to a set of Old Man Emu shocks will deliver a vastly improved ride, handling and load carrying capability to your vehicle. Emu Dakar leaf springs typically feature: * Draw-tapered and diamond-cut leaves: Ensure the load is progressively distributed over a larger surface area, reducing the high stresses that develop at leaf ends. This provides increased ride quality and protection against leaf breakage, significantly increasing the spring life * Bolt clamps and liners: The leaf clamps are bolted to allow installation of anti-squeak nylon liners * Fully scragged and load-tested: Scragging ensures the spring takes a permanent "set" which reduces the risk of sagging. Load testing ensures the spring meets the required specification. * Graphite coating: To further reduce the friction between the spring leaves and friction pads. * Military wrap: Designed to provide added safety (not available on all applications) * Anti-friction pads: Re-greaseable nylon interleaf liners reduce friction at the leaf tips where the load is the greatest * Flat axle seat area: Allows a positive, safe axle mount reducing spring stress and increasing spring life * Shot peening: The tension side of all leaves is shot peened to reduce spring stress, process can also double the life of a spring * Two-stage leaf pack: Featured on most rear springs for optimum comfort. When unladen, the vehicle is largely riding on the primary stage, with the secondary stage providing additional support when a heavy load is added

4.27 out of 5 stars ( 11 )

$259.95

$399.95

Hotchkis Sport Suspension Lowering Leaf Spring Packages

Are you looking for those hard-to-find leaf springs to finish that intimidating stance on your vehicle? Well, look no further--these Hotchkis Sport Suspension lowering leaf spring kits will not only give you the look of an aggressive drop, but they'll also help you plant and go. These leafs are the perfect additions for G machines or, if you just want a better ride, they work better than stock.

4.48 out of 5 stars ( 63 )

$349.00

Heidts Subframe Connectors

Reduce overall chassis flex on your musclecar with the addition of Heidts subframe connectors. They will improve your chassis's integrity and provide a solid foundation for the rest of your performance enhancements. Don't let your musclecar get out of shape. Keep it solid and fit for the winding road ahead with Heidts subframe connectors.

4.57 out of 5 stars ( 7 )

$322.00

H&R Sport Springs

Suspension is one of the most important factors in determining your vehicle's day-to-day drivability, and the first step in suspension tuning is to upgrade your vehicle's stock springs. H&R Sport springs are high-quality units that will not set or sag, and are designed and manufactured to be strong, resilient, and durable. H&R's Sport spring kits streamline the look of your vehicle with a reduced fender well gap, as well as lower your vehicle's center of gravity, reducing body roll for better handling. The progressive spring rate design provides superb ride quality and comfort. Additional features: * Crafted from a special (hf) 54SiCr6 spring steel to ensure premium quality and performance * Shot-peened to increase their life by more than 200 percent * Each spring is 100 percent tested * All production is completed in-house, so product quality is ensured * H&R's ISO9001 certified production facility in Germany

5.0 out of 5 stars ( 2 )

$488.99

$528.99

TeraFlex Jeep JK Wrangler 1.5 in. Spring Leveling Kits

TeraFlex Jeep JK Wrangler 1.5 in. spring leveling kits cure the factory nose-down rake of your JK Wrangler or JKU Wrangler Unlimited. Although called leveling kits, they raise the front and the rear, as well as clearing up to 33 in. tires. These TeraFlex leveling kits are ideal for mild trails due to the increased ground clearance and the ability to fit larger diameter tires. They improve approach, breakover, and departure angles. Though rocker and skid plates can help protect the body and drivetrain, these kits may not be high enough to avoid dragging, or even getting hung up, on tall objects. Additional features and benefits of TeraFlex Jeep JK Wrangler 1.5 in. spring leveling kits include: * Longer coil springs increase suspension travel * Additional spring rate prevents sagging from heavy aftermarket bumpers, winches, and cargo racks * Work with the stock-length shocks * Kits include 2 in. lift front coil springs and 1 in. lift rear coil springs, longer front sway bar links, and all necessary hardware

Not Yet Reviewed

$517.99

OER Authorized Bolt-In IFS Conversion Kits

OER Authorized bolt-in IFS conversion kits are available for 1947-54 GM pickups with a V8 engine. The kits will improve your vehicle's ride, handling, and performance. These steel crossmember kits convert your antiquated stock front suspension and steering box to a more modern 1974-78 Mustang II or 1974-80 Pinto/Bobcat setup. Enjoy better handling with the addition of rack and pinion steering and twice the suspension travel when compared to stock. Combine this advancement in steering and suspension with the added benefit of modern braking power, and this setup becomes a no-brainer. The bolt-in kit is designed for use on 1947-54 Chevy 1/2 ton or light-duty 3/4 ton frames, and will drop the ride height approximately 2 1/2 to 3 in. using stock Mustang II front spindles. Lower control arm pivot tubes and gussets are not included in this kit. (A weld-in crossmember it is also available, if preferred.) Specs: * Bolt-in components. No welding required * Proven Mustang II geometry * Can use stock 1974-78 Mustang II or 1974-80 Pinto suspension components, except control arms. * Requires tubular control arms (strut-less style lowers) * Interlocking bolt-in boxing plates reinforce frame for strength * Requires power steering rack * Stock spindles will drop ride height 2-1/2" - 3 inches * Will work with small block or big block Chevy engines * Not for use with air-ride front ends Note: Additional items may be needed to complete installation, including but not limited to tubular control arms, spindles, coilover springs/shocks, rack and pinion steering, tie rods, calipers, rotors, inner tie-rod extensions. Important: Lower control arms need to be level with the ground (with all the weight on the vehicle) for correct steering geometry.

5.0 out of 5 stars ( 1 )

$405.99

RideTech StreetGrip Sway Bars

Most vintage OEM front sway bars were calibrated with tires and cornering loads that were radically less capable than today. Ride Tech increases the diameter of the sway bars to minimize body roll through the corners and optimize handling. Incorporated into the polyurethane frame bushings is a Delrin insert to eliminate stiction and allow the sway bar to move freely and improve ride quality. In addition, many stock sway bar designs create bind and poor sway bar geometry when the vehicle is lowered. Ride Tech's beefy end link-style StreetGrip sway bars eliminate that bind, correct the geometry, and reduce body roll. Where applicable, adding a rear sway bar drastically decreases body roll and increases stability. RideTech StreetGrip rear sway bars are a direct bolt-on to your OE suspension or as part of a complete StreetGrip suspension package.

5.0 out of 5 stars ( 2 )

$395.00

Belltech Muscle Car Anti-Sway Bars

One of the best improvements you can make to your muscle car is the addition of Belltech anti-sway bars. The reduction of boat-like body roll not only creates a more confident driving feel, but keeping the body flat in turns and during emergency maneuvers increases the safety factor as well. Incorporating 20+ years of design experience, Belltech anti-sway bars are designed to improve handling and steering response by minimizing body roll while not affecting ride quality. These sway bars are manufactured from cold-formed solid steel and use swedged ends for their superior strength and reliability.

4.24 out of 5 stars ( 50 )

$272.00

$534.00

Eibach Pro-Kit Lift Springs

Eibach Pro-Kit lift springs are the perfect performance upgrade if you're still using OE shocks and your truck or SUV is still at standard ride height. Designed to provide a suspension lift without the use of coilover systems or spacer lifts, they allow full-range suspension travel without additional stress on bushings and ball joints. These kits are engineered and manufactured using the same technology found in their championship-winning ERO Off-road race springs and carefully tested to provide unparalleled ride quality and off-road capability. Order the Pro-Lift-Kit performance lift springs designed for your application. Features and benefits include: * Developed to provide balanced ride quality, control, and off-road capability * Increased ground clearance * More fender clearance for larger wheels and tires * Precision engineered for better off-road capability * Excellent on-road stability and handling * Million-Mile warranty * Manufactured using winning off-road race spring technology

4.92 out of 5 stars ( 13 )

$275.00

$490.00

Trail-Gear Rock Defense Dual T-Case Crossmembers

Specifically designed for Toyota Tacoma trucks, the Trail-Gear Rock Defense dual T-case crossmembers provide a sturdy secure transfer case mount, while also providing superior transfer case protection while sliding across any rocks your vehicle can tackle. The Rock Defense T-case crossmembers are made from 3/8 in. thick 1010 steel, so you have confidence that your transfer case is supported and covered when you are sliding over even the nastiest rocks. These crossmember kits can be mounted either by drilling the frame and bolting the crossmember in, or simply by welding the crossmember mounting brackets to the frame and bolting the crossmember to the mounting brackets. Trail-Gear also offers single transfer case crossmember kits. Both dual case and single case crossmembers use the same mounting brackets, so that once you have your single case brackets installed, there is no need to change them when upgrading to dual cases. You simply bolt dual case crossmember into the same bracket, all that is needed is an additional T-case mount. Features and benefits: * Fits 1995-2004 Tacoma T-cases, automatic and manual transmissions, and uses your stock T-case mount(s) * Rock Defense T-case crossmember kits can be mounted either by drilling the frame and bolting the crossmember in, or simply by welding the crossmember mounting brackets to the frame and bolting the crossmember to the mounting brackets * Supplied mounting brackets are 1/4 in. thick 1010 steel and all necessary Grade 8 mounting hardware is included with top locking nuts * Both single and dual case crossmembers use the same mounting brackets, so that once you have your single case brackets installed, there is no need to change them when you upgrade to dual cases—simply bolt the dual case crossmember into the same bracket, all that is needed is an additional T-case mount (sold separately) * Crossmembers are shipped unpainted and should be painted or powdercoated before being installed

Not Yet Reviewed

$399.99

Modal Header