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QA1 Adjustable 14 Inch Coil-Over Shock Kit
QA1 Adjustable 14 Inch Coil-Over Shock Kit

QA1 Adjustable 14 Inch Coil-Over Shock Kit

Universal Fit, 14" Mounted Length, Aluminum Shock Body Material, Chrome

20 Reviews | 18 Answered Questions
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QA1 Adjustable 14 Inch Coil-Over Shock Kit
QA1 Adjustable 14 Inch Coil-Over Shock Kit
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Part # 721585
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What's In The Kit
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.

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You're almost there! This kit has an option or two for you to select. Let us know which options you want for your new kit.
Item 1 of 1
QA1 Coil-Over Springs, 2-1/2 I.D., 12 Inch
QA1 Coil-Over Springs, 2-1/2 I.D., 12 Inch
Quantity: 2
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Mounted Length:
Shock Body Material:
Compressed Length:
Extended Length:
Compressed Length Range:
11.00" to 11.99"
Extended Length Range:
17.00" to 17.99"
Shaft Diameter:
Bushing Length:
Tube O.D.:
Inside Diameter:
Overall Diameter:
Sold in Quantity:


These premium aluminum bodied shocks are not a revalved race shock - they were built specifically for street rods. QA1 shocks feature 18 easily adjustable rebound settings to fine tune your hot rod's ride. This kit uses a 12" spring and available in 95,125,150, 175, 225, 250, 300, 375, 400, 450 and 500 pound. The mount length should be as close to the middle of shock travel as possible. Ride height will depend on rate of spring and vehicle weight.  Has 5/8" I.D. mounting eyes and includes 1/2" bushing. Sold as a pair.

  • This kit comes with the option of spring rate.
  • Choose from 95, 125, 150, 175, 225, 250, 275, 300, 350, 375, 400, 450 & 500.
  • The overall O.D. is 3-3/4" 
  • Shock compressed length is 11-5/8"" 
  • Shock extended length is 17""
  • 12" spring
  • 13-3/4" - 14-1/4" @ ride height
  • 5/8" I.D. mounting eyes and includes 1/2" bushing
  • Sold as a pair

Note: Shock lengths represent mounted length at ride height.

Coil-Over Chart (Link)

Coil-Over Mounting Guide (GIF)



  • Billet aluminum shock body
  • 5/8" centerless ground, hard chrome plated, solid piston rod 
  • Deflective Disc Valving
  • 3-step sealing system
  • 18-position adjuster knob changes the rebound valving
  • Allows suspension control in one easy-to-reach location
  • 100% dyno tested and serialized
  • Revalveable and rebuildable by QA1 authorized service centers


  • 2-1/2" I.D. chrome-silicon spring
  • Guaranteed to stay within 2% of rate and length FOR LIFE
Some parts are not legal for use in California or other states with similar laws/regulations

Related Products

What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • QA1 US502 Adjustable Shock and Coilover Kit w/o Spring, 14 Inch
    Qty x 2
  • QA1 Coil-Over Springs, 2-1/2 I.D., 12 Inch
    Qty x 2

More Like This


Q & A

Videos & Articles
  • Check out this coil-over mounting guide to learn about determining your spring rate, compensating for mounted angle, and measuring a replacement shock accurately.
  • We add some tuneability to the suspension on Project Chevelle by bolting on QA1 coilovers front and rear.
  • Product guru Jeff K. takes us along as he updates the suspension on his 1946 Ford Sedan Delivery with a set of fresh Mustang II coilovers following an unfortunate incident with a pothole.

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