Muncie Mainshaft - 27 Spline - Lightened

New Muncie 4 speed mainshaft for 27 spline applications.  Fits years 1964 to 1970. This is rifle drilled to remove rotating mass and has improved oil slots for 2nd and 3rd speed gears. Uses stock hubs and reverse gears to stay 100 percent compatible with your existing parts. Super accurate machine tolerances. Replaces aftermarket part number WT297-2A and General Motors part number 3915087