QA1 RCK52446 Mod Series GM A-Body Rear Pro Coil System, 220 lb.

QA1 offers bolt-in Rear Coil-Over Conversion Kits for 1973-1977 GM A-Bodies. These kits include specially designed USA-made mounting brackets, MOD™ Series adjustable aluminum shocks, high travel springs and all necessary hardware.

Single adjustable shocks provide 18 positions of simultaneous rebound and compression adjustment while QA1’s double adjustable shocks provide 18 positions of compression adjustment and 18 positions of rebound adjustment, for a total of 324 possible valving combinations. MOD™ Series shocks also feature a double adjustable design but include adjustable low-speed bleed as well for fully independent control over compression and rebound characteristics.

These shocks also utilize a fully threaded body allowing for ride height adjustability. Multiple spring rate options are also available and have been successfully tested in various applications, from casual street driving to hard core race applications.

With our highly popular adjustable struts and the addition of the Rear Coil-Over Conversion Kit, you can now get a complete suspension makeover for both ends of the vehicle.

• Made in the USA
• Easy, Bolt-In Installation
• No Cutting or Welding
• Threaded Body
• 100% Dyno Tested and Serialized
• Rebuildable and Revalveable by the QA1 Factory or QA1 Authorized Service Centers

Additional MOD™ Series Features:

• Features QuickTune™ technology - modular valve packs that allow for completely revalving the shock without having to remove it from the car!
  • Medium compression and rebound valve packs standard
  • Soft or firm compression and rebound valve packs also available
• 24 click independent compression and rebound adjustment with low-speed bleed
• Large solid piston (with blow-off valve) for improved driver feel and control with up to 1,600 lb. force
• High-speed valving adjustment (coarse adjustment)—relates to shock operation during impact events, like hitting a pothole or curb 
• Low-speed valving (fine-tune adjustments)—adjusts ride quality and weight transfer on corner entry/exit; more bleed for softer feel and less bleed for stiffer feel
• Indexable base eyelet—multiple mounting positions to optimize knob access and provide more mounting flexibility
• Thrust bearings included

Pro Coil Systems include:

• 2 Shocks
• 2 Springs
• All Mounting Brackets and Hardware

SPRING RATE CHART

The chart below is a general guideline for selecting spring rates for QA1's Rear Pro Coil Shock Systems for 73-77 GM A-bodies. Spring rates may vary depending on applications, usage, and personal preference.

1973-1977 GM A-Body
Soft	Medium	Firm
170	200	220

Fits: 1973-1977 GM A-Body

Part Numbers
Ride Feel	MOD™ Series Adjustable
Soft	RCK52444
Medium	RCK52445
Firm	RCK52446

Installation instructions for 73-77 GM A-Body Rear Pro Coil System

MOD™ Series Shock Installation and Quick Tuning Guide