Martz Chassis Subframe
Martz draws on over 15 years of research, development, and track testing for their subframe package. In-house fabbed tubular control arms and standard-height or drop spindles are included, as are 11-inch GM brakes, Carrera coilovers, and eccentric plates on the upper control arms to allow easy caster and camber adjustment. Competition upgrades include offset upper control arms for increased caster, 1-inch sway bar, 12-inch drilled and slotted four-piston Wilwoods, and single- and double-adjustable QA1 billet coilovers. For the ultra aggressive stance, drag racing, and road racing, widetrack options are available to tailor the frame to each car's needs. All packages reduce front subframe weight by roughly 200 pounds.
Four-link Rear Kits
Martz's four-link kit mounts to the inside of the framerails, allowing easier mini-tubbing once the leaf springs have been removed. Each kit includes front and rear crossmembers, Panhard bar, brackets, and Carrera coilovers. QA1 coilover upgrades are available, as well as an 1/8-inch competition sway bar package and a custom-fabbed 9-inch Ford rear.
The subframe is a direct bolt-in replacement with core support and bumper mounts installed. The rear four-link crossmember, however, is a weld-in job.
Starting at $3,050 for the base package
S&W Race Cars
Four-link Back-Half Kit
Designed for ease of installation, S&W's back-half kits greatly reduce the time and effort of back-halving. Frames arrive completely jig-welded, with the four-link mounts and upper shock crossmember installed. Pro Series rear frames are available in 24-, 26-, and 28-inch framerail widths to fit nearly any tire. Pro Series 2000 rear axle housings are also available. Standard packages include driveshaft loop, four-link tubes and housing brackets, a track locator, shock and spring kit, adjustable lower shock mounts, and PVC-coated springs. Panhard bar upgrades are recommended for street applications.
Back-halving a car is no minor task, and is a permanent modification requiring lots of cutting. You'll need an experienced shop for this one.
Standard packages start at $1,019, Deluxe at $1,269; $1,034 for Nova ladder bar package
S&W Race cars
Schwartz Performance Engineering
Performance Full-Frame Conversion
Rather than separate front and rear subframes, the Schwartz Performance chassis converts unibody cars to a full frame. This chassis comes complete with tubular A arms, splined-style sway bar, choice of QA1 coilovers or Ridetech Shockwaves, power rack-and-pinion steering, and a triangulated four-link rear suspension. All suspension points pivot on bearings or Teflon-lined spherical rod ends to eliminate the possibility of unwanted deflection, and torsional rigidity is increased by roughly 200 percent over stock. After the swap, Schwartz has seen 1.08 lateral g's with this chassis. Plus, despite adding a full frame, the overall vehicle weight is typically reduced by about 75 pounds.
Less than you'd think; Schwartz full-frame applications are near bolt-ins using the factory body mounts, and the existing rear unibody structure is maintained.
Bare welded chassis start at $3,495, call for quotes on rollers