Finally getting to it!!! 1970 Duster 340

Reason bolt broke?
It was old and tired?
Torque wrench malfunction?
Bolt too long and bottomed out?
but some are through holes.
If its threaded right through,drill it.
Start small and slow. Work your way up.
Not a through hole,left hand drill bits.
I would pull yoke. Mark nut and pinion, count turns to remove nut. Assemble being careful to line up nut to original spot on pinion. Re-assemble with threadlocker.