My 67 HO Automatic has J in box 77 and has the code PB followed by what I guess to be the trans serial number in th box above transmission unit number. It is my understanding from reading one of the restoration guides that the 67 had two models of the t400 transmissions that year. My car was early (build date 2nd week in dec 66).
I can dig up the section and try to give you the cliff notes if you think it would be helpful.
Gene
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