Your Grand AM V6 3.1L is a 4T60E as seen on this page;
http://www.txchange.com/id.htm
So yours is 150 In Lbs= 13 Ft Lbs
Also this site has a good conversion thing, plus it has the actual formula if you want to check for your self.
http://www.jaec.info/Measurement/Tor...Conversion.php