273 Commando - UTG

Ma Mopar started putting 8.75 rears in 4 speed cars mid production year of 1965. This was due to the number of 4 speed cars coming in for warranty rear replacements. Same year NHRA made a rule change that allowed 8.75 rears in Stock/SuperStock 65 cars. 66 saw 8.75 rears as standard in 4 speed cars. I would assume if the right box was checked you could get the 8.75 in an automatic.