The 1964 GMC v6 truck uses 5.5 quarts of oil or 6 if that of the oil filter is included.
A 1964 GMC V6 truck takes 5 quarts of oil when changing filter also. The correct weight is 5-30.
To change the transmission fluid on a 1964 V6 GMC truck, you will need the manufacturer manual.
Quarts of what, exactly? If it's a fluid, that depends on the engine it has.
5 quarts
8 quarts
12 quarts 15w40
5.7 quarts
7 quarts 5w20
Using a Sierra Classic 1500 Series Truck I came up with 6.1 quarts
5
3,6 litters
With filter it is approximately 6 U.S. quarts.
About 10,000 pounds.