I agree that OD would probably be off almost the entire trip, but a 700R4 DOES have a lower 1st and 2nd gear than a turbo 350, not sure about the 400. If your willing to buy a 1 ton with a 4 speed manual may be your best bet. Make sure the engine, drivetrain, and brakes are good. If your going to be hauling all that weight a 71 or 72 with disk brakes is a must, or a 67-69 with disks, but most didnt come with them stock. I can't imagine stopping 10-12000 pounds with drums....talk about skid marks in the pants!!! Drive it around as much as possible to make sure no little quirks come up. Once again, good luck and have a safe trip!!!
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