Pro Series Spool For 40 spline axles Fits 3.250″ bore aftermarket case
• Machined from 4140 forged steel • Lightened to reduce rotating weight • Broached 40 spline with 45° pressure angle • Critical dimensions left oversize prior to heat treatment • Heat treated for further gains in strength • Finish machining after heat treat to bring surfaces within specifications • Designed and machined by Strange Engineering • Forged in the USA