Torsion Bars

Unleash power, save money with Speedway Motors. Turbo setups for your 4.8, 5.3, or 6.0 LS engine offer unmatched dollar-to-horsepower value. Get it right the first time with us!

Speedway Motors announced today the introduction of a new IMCA Modified Spec Racing Engine as they kick off the 2025 race season along with discounts Jan. 27-Feb. 2 to help their customers get ready for race season.

Bump steer in race cars occurs when suspension movement causes unintended steering. This article explains what bump steer is, its causes, and how to fix it using measurements, correction charts, and bump steer kits to improve handling and performance.

Installation guide for Speedway Motors 9" Bolt-In Rear End Axle on a 1967 Chevelle. This housing allows the use of any coil-over conversion made to work with a factory housing. Learn how to fasten the third member into the housing with studs.

Now that Project Chevelle is finally making real power, we want it all to get to the ground without breaking anything. Follow along as we install a 9-inch housing, third member, and some trick tubular control arms!

Posi, limited slip, Traction-Lok, or whatever your favorite brand calls it is how your rear axle provide equal traction to both tires, and trust us, you’ll need it! So, read all about posi units and their benefits here in our guide.

There's a new spec engine option for the 2025 IMCA Modified season. Here's what you need to know.

Get more details on Project Chevelle's 9-inch housing, third member, and tubular control arms installation.

A full floating rear end is not just for dedicated track cars anymore. Many high horsepower street cars will be well suited to make the move to a Grand National style full floating axle. Read on to see why.

In this tech article, we discuss the pros and cons of the Ford 9-Inch and the Chevy 12 Bolt rear ends. Click here for our take on this classic debate.