I just bought a 1990 K1500 single cab chevy with the 350. I wrote all the RPO codes down and went inside to look them all up. Turns out this thing's got the F44 option, along with several other heavy duty options. Heavy duty suspension, brakes, radiator, oil and trans cooler, the whole nine yards.
Thing is, I have been researching this F44 option, and most places say that with that code it should have the 14 bolt, six lug rear end. Mine doesn't. Its got a ten bolt, five lug, 3.73 rear end.
What gives? Did the original owner alter the option package or something?