Swivler Spring Cup 3.25 Welded Style

The Swivler Spring Cup 3.25 Welded Style from Allstar Performance is a precision upper spring cup engineered for custom suspension builds and high-performance automotive applications. Built for street machines, race cars, and heavily modified vehicles that demand adjustability and reliability, this bolt-on component allows tuners to fine-tune spring rates and suspension geometry without permanent modifications. Whether you're dialing in a classic hot rod or optimizing a modern performance platform, this swivel-style cup provides the flexibility competitive builders need.

Manufactured from steel and finished in durable cadmium plating, the Swivler Spring Cup 3.25 Welded Style features a 7/16-20 inch thread and a welded construction that ensures concentricity and repeatable performance under load. The 3.25-inch diameter cup accommodates 5-inch springs, a common specification in independent front suspension (IFS) upgrades and custom control arm assemblies. The swivel design allows the spring to articulate naturally with suspension movement while the welded construction eliminates failure points associated with pressed or riveted designs—critical in racing environments where component integrity directly impacts safety and consistency.

Mechanics and fabricators working on Chevy-based IFS conversions, modern muscle car restorations, and dedicated road-race platforms will appreciate the engineering clarity this component provides. Installation requires access to the upper control arm or frame mounting point; the bolt-on design means no welding to the vehicle structure is necessary. Confirm your spring diameter and thread specification match before ordering—this cup is sized for 5-inch coil springs with a 7/16-20 connection. Quality suspension geometry begins with components that don't compromise, and cadmium-plated steel ensures corrosion resistance through seasons of daily driving or track duty.