I have the chance to purchace a set of axles for my truck they are mid 80s chevy axles probably C70? It is all 3 axles they have webb hubs and air brakes. He is asking $300 for all three axles and the older tube style wheels and then will throw in 4 20" tubless wheels. I just have no clue about these axles. Any info you guys can provide will help me make my decision.