Chrysler 9-1/4 Inch Street Engine Parts

Decode, ID, and upgrade your GM 12-bolt rear end. Learn axle specs, gear ratios, and best performance parts upgrades.

Wondering what a stroker motor is and how to build one? Speedway Motors has the answers with this stroker motor build guide.

In this Tech Tip, John responds to a customer looking to upgrade the 8” stock differential in his Cougar to a 9” open diff.

Gassers were those wild drag cars from the 60's that featured outrageously tall stances, big unruly powerplants, and huge slicks to propel them down the track. But just how did these insane creations come to be, and where did they go?

In this video, we go through the process of measuring and cutting 9" Ford axles.