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They are 100% dyno tested and serialized, Has simultaneous compression and rebound adjustment, One knob allows you to choose from 18 valving options, Features a precision machined aluminum piston with a PTFE piston band, Includes a 5/8\" centerless ground, hard chrome plated, solid piston rod QA1 US404 Ultra Ride Coil-Over Shock, 15.000/11.125 Ext/Comp Sku # 721US404 Mfr. Part # US404 Condition New Brand QA1 Sold Each Details
For a comfortable compression setting with 18 valving options for rebound adjustment, QA1\'s Ultra Ride shock is the best for rodding.
- Rebound Adjustable with Comfortable Fixed Aluminum
- Ride Height Adjustable
- Spring Mounting Hardware Included
- 100% Dyno Tested and Serialized
- Revalveable and Rebuildable by the QA1 Factory or QA1 Authorized Service Centers
- American Made
- Precision Machined Aluminum Piston with PTFE Piston Band
- 5/8\" Centerless Ground, Hard Chrome Plated, Solid Piston Rod
- Three Step Sealing System
Specs Position Rear Mounted Length 12.75" Shock Adjustability Single Adjustable Shock Type Twin Tube Shock Body Material Aluminum Upper Shock Mount Eyelet Lower Shock Mount Eyelet Compressed Length Range 11.00" to 11.99" Compressed Length 11.13" Extended Length Range 15.00" to 15.99" Extended Length 15" Height Adjustable Yes Spring Diameter 2.5" Spring Length 10 Inch Number of Valving Selections 18 Finish Anodized Mounted Length Range 12 1/2" - 13 1/4" Coilover Springs Included No Bushing Material Polyurethane Body Diameter 2" Sold in Quantity Each Adjustable Yes Hardware Included Yes Gas Charged No Color Black Mounting Bracket Included No MFG. Part # US404 GTIN Code 806990060860 Reviews I highly recommend QA1shocks Rated by Carnutt on October 11, 2025
Summary: Easy install, adjust ride height, set damping. Road test , perfect!!!!!
Yes, I recommend this product.
My Go to company! Rated by Bill D on May 14, 2024
Summary: I have a few sets of there shocks and coilovers. Top quality stuff.
Yes, I recommend this product.
Perfect fit Rated by Lil' Deuce on February 13, 2024
Summary: Just what I needed for my street rod.
Yes, I recommend this product.
QA1 Coil Over is great Rated by Dennis on May 12, 2022
Summary: Good product
Yes, I recommend this product.
Related Items / Suggested Parts Anti-Seize Lubricant, 1 oz AFCO 20144 Coil-Over Thrust Bearing Kit QA1 DS404 Proma Star Coil-Over Shock, 15.000/11.125 Ext/Comp Tech Support We\'re here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through Messaging and a knowledgeable Speedway Motors team member will be happy to help. About Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.
