Peter,
The 1957 6400 will have a 4500 pound front axle and a 15000 pound rear for a total rating of 19,500 pounds. The rear is made by GM and could be a 2-speed with a vacuum shift actuator.
Make sure the brake system is all new for that kind of money (new rubber and steel lines etc.), the lines fail from the inside out. The cost to do the system yourself is about $800-1,000.
Look for bondo in the rear cab corners and look at the bottom of the doors for rust repair. The rest is just common sense stuff...does everything work as it should...
Good luck with getting the truck!
Mike B
