So I've spent the last hour or so searching the forum trying to confirm which trans I have. Every time I think I've got if figured out I find another post that seems to contradicts what I thought I confirmed. I'm doing a conversion, auto to manual, on a 73. When I bought the car the 73 was complete and I got an engine and manual trans with it from a 72 Z. I have no idea of the vin # from the 72 so I have no idea of the mfg date. Looking on the manual trans I can't find any legible numbers on the casings other than casting numbers. Is there an easy way to tell from looking if it is a F4W71 A or B? The shifter lever looks like the pic below. Not sure if that helps but one of the post I read said you could tell from that.