G-Comp™ X Universal Front Suspension Kit

• Splined sway bar included, 54", 56", and 58" widths use a low-mount sway bar, while the 60" and 62" widths mount the sway bar above the frame rails. 
• G-Comp X kits take the proven performance of G-Comp to the next level
• Includes G-Comp X spindles with C7 Corvette hubs and is engineered for optimum handling and vastly improved control
• Designed and built in Lincoln, Nebraska
• Power rack-and-pinion steering 
• Brake kit and coilovers are required to complete the kit
• Designed to use C6 Corvette-style brake kits
• 54" kits use 2"x 4" .120-wall steel frame rails, 56" and wider kits use 2" x 3” .120-wall steel rails
• G-Comp X control arm provides an additional 3° caster over standard G-Comp arm
• Inverted ball joint on upper control arm allows use of deeper backspace wheels and tighter turning angle
• Lower control arm has a recessed front strut to increase tire clearance
• New wheel hub upgrade for improved strength and serviceability

An Ultra High-Performance Suspension for Whatever You’re Building

There’s a reason you see classics like Camaros and Chevelles at every cruise night or track day. They’re beautiful cars that are plentiful and have a ton of aftermarket support to make them faster and fit for the racetrack. But what about the rest of us? For every one of those popular platforms there are a bunch of cool classics that just need some improvement in the suspension department to make them into fun, fast performance cars that really turn heads when they roll up to the autocross or road course. Those are the cars we had in mind when we developed the G-Comp X Universal Front Suspension Kit. 

With the Universal G-Comp Suspension, the engineers at Speedway Motors figured out how to adapt the track-proven performance of the direct-fit G-Comp suspension kits to a wide variety of platforms. The G-Comp X Universal Front Suspension Kit takes that widely adaptable performance to the next level. G-Comp X suspensions were created to answer the demands of Speedway Motors’ test drivers., adding more adjustability, more stiffness, and the ability to run multiple shock lengths. These are state-of-the-art competition suspension systems that are designed, built, and tested in Lincoln, Nebraska to provide a drastic improvement to your car’s handling, no matter what you drive. 

Track Proven Performance

It all starts with the G-Comp suspension geometry. G-Comp is engineered with race-winning architecture perfectly suited to modern pro touring builds. G-Comp front suspensions are designed to make the most of modern tires with wide tread and sticky compounds. G-Comp is engineered with optimal camber gain, meaning that as the suspension compresses in a hard corner, the top of the tire is pulled in, keeping that wide rubber planted to the pavement.G-Comp X Kits add an additional three degrees of caster, making more extreme track day setups possible. We know from firsthand experience how G-Comp and G-Comp X Suspensions can totally transform the character of an old car. These suspension systems were not just designed to work on paper. They have been extensively driven, raced, and abused in our own fleet of test cars by Team Speedway, who can be found most weekends at the autocross track, dodging cones and taking notes about how to make G-Comp and G-Comp X suspensions better, stronger, and faster.

A Strong and Adaptable Universal Suspension

Our engineers packaged all of that proven performance into a universal subframe available in different track widths and frame rail widths to make them adaptable into just about anything you can dream up. We’ve seen them go into everything from Lincoln Zephyrs to Studebakers to F1 pickups. G-Comp X Universal G-Comp front suspensions are available in 54”, 56”, 58”, 60”, and 62” track widths. The 54” kit offers G-Comp performance in an ultra-narrow track width and can be used in many smaller cars where previously a Mustang II was the only option. Those dimensions are the hub-to-hub width, which means that even more fine tuning is available by changing wheel offsets. The 54” kit is built on a subframe with 2" x 4" frame rails that measure 27” outside to outside, the 56” and 58” track widths have 2" x 3" rails that are 29 ¾” inches outside to outside, while 60” and 62” kits also use 2" x 3" tubes that are 33-3/4” on the outside. Also note that 54”, 56", and 58" widths use a sway bar mounted to the bottom of the frame rails, while the wider 60" and 62" versions use a high-mount sway bar that is positioned above the frame rails

The subframes are made from .120”-wall tubing. These 48”-long straight sections of frame rail provide a straight and square reference and plenty of material to help you adapt the subframe into your car. Motor mounts are not included in this kit, leaving the door open for custom mounts to fit your specific engine and chassis. G-Comp X front subframes are built with tubular hoops and fabricated braces that support the upper shock mounts. This creates an extremely stiff assembly that is designed to neatly connect to a full roll cage for the ultimate in rigidity and safety. G-Comp X front suspensions also use a heavy-duty fabricated upright that uses tough C6 Corvette hubs. This equates to an extremely trick and virtually indestructible upright and hub that’s designed to withstand the extreme side-loads generated by hard cornering on the track. 

Rack-and-Pinion for Precise Steering

Rack-and-pinion steering is engineered into all G-Comp front suspensions and the rack is included in the kit. A steering rack is lightweight, compact, and precise, offering quick and crisp steering feedback well suited to performance driving. That’s why the OE’s have been using them for decades. Because of all the benefits, installing a steering rack is a common upgrade to many classic cars, but care must be taken when installing a rack to the stock suspension. If the steering rack is not sized and positioned properly to work in concert with the suspension geometry, any improvement will be lost to nasty bump steer and dangerous handling. All widths of the Universal G-Comp and G-Comp X suspensions are engineered with the rack-and-pinion where it needs to be to deliver safe, reliable, precise steering. 

Coilover and Brake Kits to Further Dial-in Your Suspension

G-Comp kits use an upper spring pocket to seat the spring. G-Comp X kits instead use billet aluminum plates and adjustable upper shock mounts to really open the door to some full-tilt setups. Not only can a variety of shock lengths and strokes be used, this setup also allows for extremely heavy springs with large wire diameters to be used. While it’s recommended for all G-Comp suspensions, adjustable shocks are a must to get the most out of an G-Comp X Suspension. The ability to adjust the shock’s compression and rebound is a valuable tool when it comes to setting up a car to handle just the way you want.

Universal G-Comp and G-Comp X front suspensions accept C6 Corvette brake kits. That means there’s a wide variety of high-performance kits out there to make your car stop on a dime. We have found with our autocross fleet that six-piston calipers and 13-inch diameter rotors work well to deliver sufficient stopping force for extreme performance on the track. 

G-Comp™ X Heavy-Duty Wheel Bearing Hub Upgrade

We’ve upgraded these kits to our G-Comp™ X Heavy Duty Wheel Bearing Hub. This patent-pending, billet-steel C7-style hub uses race-proven Wide-5 tapered roller bearings and a design that positively locks bearing preload for maximum strength, consistency, and safety under high lateral loads. It arrives assembled with ARP studs and high-quality lubricant, and its maintenance-friendly layout makes inspection and re-lubing straightforward. The result is measurably stiffer camber support that resists deflection, helps prevent brake pad knockback, and delivers a more consistent pedal feel in autocross and road-course use. 

This replaces the previous factory-style C7 hub approach used with our fabricated uprights, aligning the hub with the rest of the G-Comp X system’s race-ready intent and bringing hub manufacturing and quality control in-house at Speedway Motors. In short: stronger, stiffer, and easier to service—now included in all new G-Comp X kits.

Recommended Brake Kits for G-Comp Series Front Suspensions:

• 835-1408921-D Wilwood 13" Brake Kit
• 835-1408921-DR Wilwood 13" Brake Kit

Recommended Coil-Over Shocks and Springs for G-Comp Series Front Suspensions: (2 of Each Required)

• 1061340CT - AFCO Street/Pro-Touring Coilover Shock (non-adjustable)
• 1063845PTCZ - AFCO Pro-Touring/Race Coilover Shock (single adjustable)
• 100205 - AFCO Max Performance/Race Coilover Shock (double adjustable)
• 106284001CR - Afco 8" Chrome Coilover Spring
• QA1 Mod Series Shocks Left and Right with QA1 10” Coilover Spring

3503000-62 Instructions

3503000-60 Instructions

3503000-58 Instructions

3503000-56 Instructions

3503000-54 Instructions

 

 

• Only available with 5 on 4 ¾ bolt pattern (GM Pattern).
• Uses standard 3/4"-36 spline Steering input shaft U-joint
• The 54" subframe is 27" outside of rails and uses 2" x 4" x .120" wall tube
• The 56" and 58" subframes are 29-3/4" outside of rails and use 2" x 3" x .120" wall tube
• The 60" and 62" subframes are 33-3/4" outside of rails and use 2" x 3" x .120" wall tube
• These frame rail dimensions are consistent for this 3503000 Unser Edition system and the 3502000 G-Comp Universal subframes