45Rico____,
Final pickup sales numbers for 2012 including fleet sales which GM hasn't participated in for years is at this site. The accounting source and publisher is R.L. Polk:
http://news.pickuptrucks.com/2013/03/update-total-retail-fleet-2012-sales.html
GM truck 641,590
Ford truck 621,232
Ram truck 280,462
Final sales numbers for 2011 had GM ahead by a few thousand and I will post the link after I access it again. Too darn much work getting all 15 years as I did it once and had posted them. The numbers you posted were preliminary and before the final tally which occurs in Feb or Mar. It varies year to year. Mark V's post about 15 years of truck sales leader by manufacturer is correct.