Vehicle pulls severly to the right when driving at any speed. on 2008 Buick LaCrosse

Car purchased new Aug., 2008, and pulling to the right is an original problem. Mileage is now just under 10,000 miles and has been in dealership 4 times where they have verified problem, checked alignment which is within GM specs, checked tire pressure, checked front tires for road force variation, adjusted alignment angles, checked all 4 tires for road force variation and tire pull, installed tires on car for zero tire pull as displayed on tire balancer. They cannot resolve problem.

Asked by for the 2008 Buick LaCrosse
2 answers
I put on a different brand of tire on my Lacrose. It runs straight now.
Intermediate shaft $75
installed $300