ok, i just got back looking at a truck.it's an 85 k20 with a complete 1 ton setup underneath it. sorry no pictures, couldnt get a digital camera in time. i looked under there and the rear axle looks like a 12 inch rockwell...the tag on the glove box door said that it had 4.10's and locking rears. i dont know what the front axle is, there was a plow setup and it was parked more or less on a bush so i couldnt get a good look. its got a 208 case and a turbo 400 tranny. 350SB.. pretty standard stuff as far as that goes. so the question is what is up with the axles. did they put a rockwell under there or am i mistaking it for an eaton? and what would the front axle be? thanks alot for the help.