1967-1976 A-Body, Barracuda, Duster, Valiant Chassis

SchwartzPMopar Full Frames

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1967-1976 A-Body, Barracuda, Duster, Valiant Chassis

Your Mopar's uni-body construction is inherently weak. Our G-Machine Chassis isn't.

Introducing the FIRST and ONLY bolt-in full length frame / chassis for your Mopar unibody!

The sheet-metal that your suspension components and engine are mounted to begins to flex dramatically once you add more horsepower, higher spring-rates and better brakes. With our G-Machine Chassis, your engine, rear-end, steering and suspension are isolated from the body. The G-Machine Chassis becomes the main support for your car and the uni-body structure simply becomes added support, helping to tie together the G-Machine Chassis. Currently, our G-Machine Chassis is available for 108" wheelbase Mopar A-Bodies only, which includes the following 1967, 1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, and 1976 models:

  • Barracuda
  • Valiant
  • Duster
  • Demon
  • Dart Sport (73-76)

Installation is simple.

  • The front frame rails & shock towers get removed. The voids in the shock towers can be plated off with sheet metal (not included), or fabricate full inner fenders for a clean engine bay look.
  • You need to notch the torsion bar crossmember for our chassis rails to pass through, and weld our brackets to the crossmember.
  • A small notch in the rear footwell is required for our rails to pass through. The chassis will impede into the interior only about an inch upward. The notch is approx 16" x 2.5".
  • The spare tire well needs to be removed, and we supply a plate to weld or bond in place.
  • Attachment points include: Front rail/bumper bracket holes; Toe board area (a bracket gets welded to the toe board); Torsion bar crossmember (total of 4 brackets get welded here); and 2 attaching points per side onto the factory rear frame rails (some welding required onto your body).
  • Depending on the transmission choice, your tunnel may need to be modified.
  • Some firewall modifications may be necessary depending on engine choice. We have not test fit all engines into all A-bodies yet. We do know the Hellcat engine requires firewall modification. 
    All engines chosen require a rear sump oil pan to fit our crossmember.

Want wider tires?

  • All G-Machine Chassis allow fitment of up to 345mm-wide rear tires if you minitub the wheel wells! 
    This is achieved by notching the factory rear rail. You will not sacrifice rigidity by doing this, since our frame has been added. On a stock car, this would decrease rigidity.

Which options do I choose?


Our 13" Wilwood kit is great for daily drivers and the occasional autocrosser or road racer. These require at least a 17" diameter wheel, though some 16" fit. -Step up to the 14-inch Baer 6P Pro-Plus and get a brake system that will suit whatever you want to do. We race our 1965 Tempest often with this brake setup. The baddest kit is the Baer 6S, which is a one-piece forged caliper. This brake kit suits the hardcore roadracer, but does not sacrifice street driving. The 14" brakes require a 18" diameter wheel, however. Additionally, the Baer calipers are available in many colors, while Wilwoods are available only in black.

brake options1

Coilover shocks:

We use RideTech coilovers as standard on our chassis systems. The two options we offer are single-adjustable and triple-adjustable. -Single adjustable coilovers offer 24 "clicks" of adjustment for damping, as well as ride height adjustment. These will suit the weekend autocrosser/roadracer, as well as daily drivers. Triple adjustable coilovers offer the same damping adjustment as the singles with the addition of high and low speed compression adjustments, and a remote reservoir. These allow you to fine-tune your suspension for a specific type of driving. These are recommended for those who are willing & able to spend time tuning the shocks, and/or for the roadracer where every thousandth of a second counts. Air ride is NOT available on the Mopar A-Body chassis.

 coilover options1

Rear end housing:

Our standard axle is a Moser full-floating 9" style housing, with 31-spline axles. We recommend this option up to 900hp street cars. Contact us if you are putting more power to the ground, and/or will be drag racing on slicks. -The Schwartz IRS option is for those craving an IRS in their musclecar. This is recommended for up to 700hp. We can also provide Mopar housings for those interested. Please call for information & pricing.

Third member/differential:

The Ford 9" comes with a clutch-type posi. Our first option is just that, with a cast-iron center section. If you have less than 500hp and won't be racing the car often, this is just fine for you. The Detroit TrueTrac differential is a helical-gear type posi, which holds up to more power than the clutch posi, lasts longer (no wearable parts), and is quiet enough for street cars. Moser offers a new nodular iron case which is recommended for 600+ hp and racing. Their aluminum case also holds up to higher horsepower, and is much lighter than iron cases.



Base price includes:

  • A fully welded chassis, built on a precision jig
  • Transmission crossmember
  • All front and rear suspension components (excluding coilovers): Spindles, control arms, low-friction ball joints, tie rods, power rack & pinion, HD splined sway bars/arms/links, and teflon-lined spherical rod end joints for a quieter & bind-free suspension

Payment terms: 75% down at time of order, remaining 25% due before shipment.
Shipping: For an assembled frame, we use an enclosed car transporter. If you don't want the frame assembled, we'll ship it truck freight in a crate. There is a crating fee which will be determined upon ordering.

Pricing below is only for reference! Please CALL to order.