Larry Dietrich

QUINCY — Larry Dietrich says nothing has changed at Quincy Mack except the name of the business. Nextran Truck Centers, a full-service commercial truck dealer, acquired Quincy Mack, a Quincy truck dealership, on Nov. 22. The sale price was $2.585 million for the business and the 8.55-acre lot at 5014 Broadway, according to property tax…