I need to find a third member or whole rear axle for either a 93 or 94 2wd truck. The axle code I am looking for is A01A with the 3.42 gears.
I don't think you're looking at the right code. the paint and trim codes are right next to the trans and diff codes. the diff code will indeed start with an F or G (G for 4wd and 4 speed 2wd, F for all other 2wd) and end in a number, most likely 1 unless you have a factory LSD, in which case it'll be a 4
This website has info on the axle codes, and it matches what is on the door jam tag. Gearratiosanddiffs