Bucking recent trends, the reduction in the first-quarter 2018 production outlook will result more from cuts in trucks, as well as in total output in Mexico.
Totals were up across all four regions, with the biggest growth coming from South America.
The year will finish with 17.1 million vehicles sold, 2.0% behind 2016.
Results varied among manufacturers in the region, with huge gains by several automakers while others pulled back production.
Despite a 12.6% drop in Class 6 sales, Canada big-truck sales saw large gains in November.
Another month of booming double-digit sales put U.S. big trucks 1.9% ahead of 2016.
Year-over-year losses by both cars and light trucks left Mexico LV sales down 8.5% in November.
U.S. demand will have to stay close to the 17 million-unit SAAR level early next year for inventory not to again become a problem of excess.