The 6400 is a 2 ton truck with a front axle rating of 4000 or 4500 lbs. at the ground. If you have the original specs for the truck it will spell out the GVWR, for example, mine is a 5700 with a 16,000 GVWR with 9.00-22.5 tires - it weighs 7000 lbs. empty so a payload of 9000 lbs. without exceeding manufacturer specs.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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