From what i see the 1967-1972 chevy and gmc trucks had Eaton or Dana rearends , i found myself online for sale a 1967 chevy one ton truck the GVW on the Vin plate is 10,000 lbs the wheel base is 133 inch , im thinking the rear grearing is 514 but i was thinking about 411 or 457 , i want to be able to go on the highway with a trailer at 65 or 70 not at 45 or 50 , how hard is it to change a rearend grearing,chuck , there is a 67-72 chevy&gmc one ton truck its wheel base is a 147 inch the GVW for that is 14,000 lbs rearend grearing is 617
