Ref. 12 and 13 shift rails originally had three grooves around the rail circumference. Service bulletin NLB SB 006 90 explains that the only groove that now runs the circumference is the neutral groove. The two in gear positions have flats for the detents. This improves the shift action.
Ref. 12 and 13 shift rails originally had three grooves around the rail circumference. Service bulletin NLB SB 006 90 explains that the only groove that now runs the circumference is the neutral groove. The two in gear positions have flats for the detents. This improves the shift action.