MOMENTUM CHASSIS,FRAME,SWAY BARS,ARMS,SPINDLES,4-LINK,68-72 GM A-BODY,PIN,NARROW

Brand New Ridetech Momentum Chassis with Pin Spindles & Narrow 57.25" Flange to Flange Width (Part #11243798).

For nearly 30 years, Ridetech has pushed the boundaries of suspension performance within the constraints of factory chassis geometry. Ridetech’s Momentum Chassis Series changes all that.

This is Ridetech’s first-ever complete performance chassis: designed, engineered, and manufactured in the USA from the ground up for the GM A-Body platform. It delivers superior handling, increased wheel and tire clearance, and unmatched compatibility all within the adjustability and strength builders demand.

Fits:

• Buick:
  • 1970-1972 GS
  • 1968-1969 GS 350
  • 1968-1969 GS 400
  • 1970-1972 GS 455
  • 1968-1972 Skylark
  • 1968-1969 Special
• Chevrolet:
  • 1968-1972 Chevelle
• Oldsmobile:
  • 1968-1971 442
  • 1968-1972 Cutlass
  • 1968-1972 Cutlass Supreme
  • 1968-1972 F85
• Pontiac:
  • 1968-1969 Beaumont
  • 1968-1972 GTO
  • 1968-1972 Lemans
  • 1968-1970 Tempest
    

Notes:

• Does not fit A-body Wagons or 4-doors, 1969–1972 Grand Prix, 1970–1972 Monte Carlo, and El Camino / GMC Sprint.
• 3rd member, steering rack, coil-overs/air ride, and rear sway bar sold separately.

Includes:

• Chassis
  
• Front Sway Bar
  
• Upper/Lower Control Arms
  
• Ball Joints
  
• Pin Spindles
  
• Rear 4-link
  
• 9'' Rear Axle Housing
  
• Installation Hardware

Features:

• True Performance Geometry:
  
  • Reengineered suspension pickup points improve camber gain, caster, roll center, and Ackermann.
    
• Ride Height Adjustable:
  
  • Like existing Ridetech A-body systems this chassis lowers vehicle ride height roughly 2’’ from stock. 
  • Can be adjusted to suit desired height.
    
• Improved Tire Clearance:
  
  • Front: Up to 275/40R18 on 18×9″ (6″ BS) or 18″x10″ (6.5″BS) | Larger fitments possible when using steering rack limiters & modified inner fenders.
    
  • Rear: 295/40R18 on 18×11″ (6.5″ BS) | Mini-tubs can allow up to 335mm rear tires.
    
• Modular Suspension Compatibility:
  
  • Choose Ridetech/Fox Factory Coilovers or Shockwave Air Suspension (Sold Separately).
  • Bolts directly in.
    
• Steering Modernization:
  
  • Rack-&-pinion steering improves steering feel and feedback.
  • Uses common 1999–2004 Mustang rack (PSC #11009556 recommended). Sold separately.
    
• Robust Driveline Foundation:
  
  • Fabricated Ford 9” Rear Axle Housing available in standard width to accommodate multiple build styles. 
  • Third members with popular rear end ratios are also available. 
    
• Engine & Transmission Flexibility:
  
  • Accommodates small/big block Chevy, Buick, Oldsmobile, Pontiac, LS, & Gen V LT engines.
  • Adjustable transmission crossmember accepts popular manuals & automatics
    
  • (T56/TKX) and automatics (TH350, 700R4, 4L80E). This is NOT an exhaustive list.
    
• Braking Option:
  
  • Pin spindles
  • Works with stock-style & aftermarket Wilwood/Baer kits (Sold Separately).
• Chassis Features:
  • Tubular upper & lower control arms with Delrin bushings | Polyurethane body bushings
    
  • High-quality ball joints, billet sway bar mounts
    
  • Accepts OE-style or EFI-ready fuel tanks (with 45° corner notch) or custom fuel cells, offering potential savings over other chassis
    
  • Recommended Tanks Inc. part numbers: TM34EN-T (68-69), TM34 BN-T (70), TM34UN-T (71-72) 
    
  • Frame channels for clean fuel & brake line routing
    
  • Optional 3-joint steering bearing mount for better header clearance (ideal for big block engines, sold separately)
    
  • Improved header clearance & exhaust routing allow for a variety exhaust solutions
    
  • Durable powder coat finish
    
  • No cutting or floor pan modifications required
    
  • Designed for use with factory parking brake cable
    
  • Large 1.5” front sway bar improves weight transfer and reduces body roll.
  • Features billet aluminum mounts, low friction bushings, and ball joint style linkage.
  • Bar rate = 1,000lb/in rate
• Front Suspension:
  
  • Roll Center Height: 2.16″ 
    
  • Camber Gain: 1.07° per inch of compression
    
  • Caster: 7°
    
  • Anti-Dive: 20%
    
  • Steering Angle: 26-29 degrees
    
• Rear Suspension (Anti-Squat %):
  
  • Roll Center Height: 13”’
    
  • Anti-Swat Adjustment Range – 55%-175%

You can view and download the assembly instruction booklet here.