What 8 3/4 rearend do I have?

crackedback said
That chart butter put up is so wrong...

Here is a better source with CORRECT lengths.
http://www.moparts.org/Tech/Archive/axle/16.html

It's a 65-67 B most likely

I wish someone would get rid of that crappy chart, it's all over the place and not worth the pixels to display.

I agree, there is some incorrect info on that chart.
I posted it because of the schematic, it's easier to see where the dimensions come from for new folks.

Maybe I should try to make one with the correct dimensions.