Ridetech 64-67 GM A-Body Rear MuscleBar

Adjustable-Rate Rear Sway Bar Engineered for 1964-1967 GM A-Body Muscle Cars

The Ridetech 11239122 MUSCLEbar Rear Sway Bar brings modern suspension engineering to the 1964-1967 GM A-Body platform, covering the Chevrolet Chevelle, El Camino, Buick Skylark, Buick Special, Buick Gran Sport, Buick Sportwagon, Oldsmobile Cutlass, Oldsmobile 442, Oldsmobile F85, Oldsmobile Vista Cruiser, Pontiac GTO, Pontiac LeMans, and Pontiac Tempest. Using the same sliding-clamp rate-adjustment system found across the Ridetech MUSCLEbar lineup, the 11239122 allows you to select from a continuous range of bar rates between 200 and 400 lbs without removing or replacing the bar itself. Precision CNC-bent 1-inch diameter steel tubing with a .156-inch wall gives the bar the dimensional accuracy and torsional rigidity needed to produce consistent, repeatable rates. Billet aluminum anodized-black frame mounts and low-friction bushings eliminate the bind and stiction that plague conventional rubber or polyurethane bushing designs, keeping the bar's response clean and linear. Posi-Link end links are included for a complete, bind-free installation on stock or Ridetech trailing arms.

Key Features

• Ridetech 11239122 adjustable-rate rear MUSCLEbar for 1964-1967 GM A-Body vehicles including Chevelle, El Camino, GTO, LeMans, Tempest, Skylark, Special, Gran Sport, Sportwagon, Cutlass, 442, F85, and Vista Cruiser
• Sliding aluminum clamp allows continuous rate adjustment from 200 to 400 lbs without swapping bars
• 1-inch diameter precision CNC-bent steel tubing for dimensional accuracy and consistent bar rates
• .156-inch wall thickness for rigidity and long-term durability
• Billet aluminum anodized-black frame mounts resist corrosion and deliver a clean finished look
• Low-friction frame bushings eliminate the stiction and bind of rubber or polyurethane designs
• Posi-Link end links included for precise, bind-free connection to the rear axle
• Compatible with stock GM A-Body trailing arms and Ridetech trailing arms
• Ideal for lowered vehicles where factory sway bars no longer provide adequate geometry

Fitment

Specifications

What's Included

• 1x Ridetech 11239122 adjustable-rate rear sway bar
• Posi-Link end links
• Axle brackets
• Frame brackets and mounting hardware
• U-bolts and all fasteners required for installation
• Bar rate documentation

Frequently Asked Questions

The Ridetech 11239122 MUSCLEbar fits 1964-1967 GM A-Body vehicles including the Chevrolet Chevelle, El Camino, Buick Skylark, Buick Special, Buick Gran Sport, Buick Sportwagon, Oldsmobile Cutlass, Oldsmobile 442, Oldsmobile F85, Oldsmobile Vista Cruiser, Pontiac GTO, Pontiac LeMans, and Pontiac Tempest. All models sharing the standard GM A-Body rear suspension platform are covered.

The 11239122 uses a sliding aluminum clamp on the bar that moves fore and aft to change the effective lever arm length. Positioning the clamp further from the axle bracket connection reduces the rate toward 200 lbs, while moving it inward increases the rate toward 400 lbs. This allows continuous rate tuning without removing the bar or ordering a different part.

Yes. The 11239122 is designed to bolt directly onto stock GM A-Body factory trailing arms as well as Ridetech trailing arms. No custom fabrication or trailing arm modification is required for installation on a standard A-Body rear suspension configuration.

Unlike conventional fixed-rate sway bars, the Ridetech 11239122 uses CNC-bent tubing to exacting tolerances, billet aluminum low-friction frame mounts, and an adjustable sliding clamp end link system. These features eliminate the rate guesswork, reduce bushing bind, and allow chassis tuning to be performed without replacing hardware.

Yes. The 11239122 MUSCLEbar was developed specifically for lowered vehicles where the factory sway bar geometry is compromised. The adjustable rate system and Posi-Link end links allow the bar to work correctly across a wider range of suspension geometry than fixed-rate bars.

Yes. The 1964-1967 Pontiac GTO and LeMans share the GM A-Body platform and are fully supported by the 11239122 fitment. Both the GTO and LeMans use the same rear suspension mounting points as the Chevelle and Skylark on this platform.

The 11239122 includes Posi-Link end links, which are Ridetech's spherical-bearing end link design. Posi-Links provide a bind-free, low-friction connection between the sway bar and the rear axle, avoiding the deflection and flex common with conventional rubber or polyurethane end link bushings.

For most standard 1964-1967 GM A-Body applications, the 11239122 uses the existing frame mounting locations with the included brackets. Drilling is generally not required on original unmodified frames, though custom or tubbed builds may need additional clearancing depending on the specific chassis modifications performed.

Installation Instructions

1. Safely raise the rear of the vehicle and support on jack stands at the frame rails. Do not support by the rear axle.
2. Place a floor jack under the rear axle to allow controlled movement during installation.
3. Install the frame brackets at the designated mounting points on the frame rails. Snug fasteners only at this stage.
4. Slide the low-friction bushings into the frame brackets and position the sway bar through them.
5. Attach the axle brackets to the rear axle housing using the supplied U-bolts. Snug only at this stage.
6. Connect the Posi-Link end links between the sway bar ends and the axle brackets. Ensure all rod ends are properly threaded and seated.
7. Set the sliding aluminum clamp to your desired rate position before final tightening.
8. Lower the vehicle to ride height and torque all hardware to specification including the axle bracket U-bolts, frame bracket fasteners, and Posi-Link hardware.
9. Verify full clearance between the bar and all chassis, body, exhaust, and fuel system components through the complete suspension travel range.
10. Recheck all fastener torques after the first 100 miles of operation.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.