QA1 MG401-10350B Mod Series GM Front Pro Coil System, 350 lb.

The QA1 GM Pro Coil System for 1968-1972 GM A-Body vehicles is a great option for anyone looking for fully adjustable ride height and valving control. Choose a spring rate and adjustability that fits your driving style, adjust the valving to match and you are on your way. These shocks also utilize a fully threaded body that allows you to adjust your ride height for the perfect stance or to finely tune the weight balance for superior handling.

Specially designed for QA1's Pro Coil Systems, the American-made lightweight high travel springs* have fewer coils and a smaller wire diameter, resulting in increased travel due to the larger distance between the coils. They reduce unsprung weight and react faster, optimizing suspension performance. Multiple spring rate options are also available and have been successfully tested in various applications, from casual street driving to hard core race applications.

Adjustable Pro Coil System Features:

• MOD™ Series - independent compression and rebound double adjustable
• Lightweight Billet Aluminum Coil-Over Shocks
• High Travel Springs*
• Easy, Bolt-In Installation
• Ride Height Adjustable
• 100% Dyno Tested and Serialized
• Serviceable and Rebuildable by QA1 Authorized Service Centers
• Made in the USA
• Used in drag racing, street performance, autocross, road racing and street rod applications
• Sold in Pairs

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 position to optimize knob access and provide more mounting flexibility
• Made to be used with bottom eyelet style mount in tubular control arms
• Thrust bearings included

SPRING RATE CHART

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

AVERAGE VEHICLE WEIGHT

Not sure what your vehicle weighs? See our detailedwith Vehicle Weights for general guidelines on determining the approximate weight of popular vehicles.

BUICK
GS 1970 - 1972
GS 350 1968 - 1969
GS 400 1968 - 1969
GS 455 1970 - 1972
Skylark 1968 - 1972
Special 1968 - 1969
Sportwagon 1968 - 1969
CHEVY
Chevelle 1968 - 1972
El Camino 1968 - 1972
Malibu 1964 - 1967
OLDSMOBILE
442 1968 - 1971
Cutlass 1968 - 1972
F85 1968 - 1972
Vista Cruiser 1968 - 1972
PONTIAC
GTO 1968 - 1972
Tempest 1968 - 1970

MOD™ Series Shock Installation and Quick Tuning Guide

MOD™ Series Pro Coil Installation Guide

Spring Rate Chart (PDF)