A late war US tank battalion was made up of 3 companies of Shermans and 1 company of Stuarts. For a total of 53 medium, and 17 light tanks. In addition to 6 Shermans converter to 105mm howitzers.
http://www.militaryresearch.org/17-25 18Nov44.pdf
http://www.militaryresearch.org/17-25 18Nov44.pdf