2009-2012 Challengers with the 5.7L engine and automatic transmission are being "recalled" (Customer Satisfaction Notice) to replace the timing chain, tensioner and guide. The work will take about four hours. http://www.dodge.com/universal/webselfservice/pdf/P01.pdf
Ha ha ha ha ha ha ha ha ha! But the dealer will have your car for four days! Old thread I know, but I just had this done on a used car I bought...