We were checking out Speedway Motors' bolt-together 1935-40 Ford display chassis recently and noticed something interesting about its Mustang II–style front suspension. The upper spring seats feature threaded adjusters, which allow the fine-tuning of ride height and suspension geometry. When we commented on this feature, we were told that not only was it standard on the 1935-40 IFS crossmember (as well as the similar 1947-54 Chevy pickup crossmember), but that Speedway also offers similar adjusters that can be installed on just about any aftermarket Mustang II–style IFS setup.
The concept behind Speedway's Mustang II Ride Height Adjusters is pretty simple: The upper spring seat is built on a threaded adjuster sleeve, which fits inside a threaded adjuster ring mounted to the spring tower on your frame. This allows the upper spring seat to be adjusted up or down to fine-tune your car's final ride height up to 2 inches. One of the primary benefits of this is the ability to adjust the suspension for proper travel and geometry, especially as the coil springs age and settle. Of course, many rodders will also like the idea of making slight altitude adjustments to fine-tune the appearance of their car, too. The adjusters can be used with nearly any aftermarket Mustang II–style front suspension that uses conventional coil springs and shocks.
We were able to walk through a sample installation of Speedway's ride height adjusters recently and found the process to be simple and straightforward. Take a look and see if these adjusters might be the solution you need for your ride-height woes, or maybe just a helpful tuning option to incorporate into your next Mustang II install.