The hole that is broke in half is the dowel pin hole. It is used to align. Center to center motor to trans. Whenever you install a different trans on a motor or vise versa. You should always indicate the trans or bell. Brewers sells offset dowels to correct the alignment. It is a must for proper wear on mains and pump bushing or input bearing on a 4 speed. Makes a big difference in performance.
Good blow proof bells come with oversize dowel holes . You indicate the bell, Tighten all bolts then weld the thick dowel washers in place that are provided with the bell. This is a must or premature wear and loss of power wil result.
When ever you change the trans or factory bell by the offset dowels and do it right.
Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists
