CLASSIC MINI GEARBOX BEARING 1ST MOTION INTERNAL 4 SYNCRO CHM172 PRE A+ BMC AJ6

Classic mini 1st motion gearbox bearing. This is the bearing for the end of the mainshaft where it fits into the 1st motion 4th gear on 4 syncro a-series gearboxes.  

Essential to replace this bearing when rebuilding the gearbox due to the small size they suffer from failure more frequently than the later gearboxes.   

Part number for reference : CHM172