yea  he has a  chaindrive  pass side  output,  with the same 7.5 front diff as  the  86-94 runners had here

A09B   A is supposed to indicate 7.5"
09  is a 4.22:1 r&p
 B=4 pinion



however in your case i believe  A 09 B  indicates  7.5 in front and 8 inch in rear