11/02/67 = transmission assembly date
12/13/67 = car's "scheduled" production date

if it has always been an 18-spline,
then it was from a HEMI Road Runner OR 440/HEMI GTX

RM21J8G
RS23L8G / RS23J8G
RS27L8G / RS27J8G

Last edited by 6bblgt; 07/10/17 01:13 PM.