I just bought a '78 FJ45 that has drum front brakes. The guy I bought it from said that he has a complete front axle from a late '70s FJ40 that should bolt right on that had factory disc brakes and wants $250 for it. Is that a good deal? Does that decrease the value of the truck since it was not what it originally came with? (anyone know if the '78s in other parts of the world came with discs?) Anything else that I should know before I do this, assuming it is a good deal and worth doing? Gears? My goal with this truck is to keep it stock but to also have it functional. Thanks!