I have a 2011 malibu 1LT 4cly that I recently purchased to tow 4 down. After reading the post here I called GM customer service at 1 800 222 1020 Spoke to a rep name Robert, talked to him about towing 4 down and etc > Gave him my vin# so he could verify the transmission in my malibu. He said he would find out about all my concerns and call me back in 4 days which he did, said my malibu had a 6T70 6 speed tranny and could absolutely be towed with 4 down.....I owned a 2007 malibu that I towed and never had a problem of any kind..
I received the same info finally after being told just the opposite. It seems that after many calls, customer service got in touch with engineering and got the correct information. I received info from engineering before the area rep called me. There is a gap in communications between engineering and customer service and the dealers. If the correct info had been available it would have saved me a lot of grief. I am having my base plate installed on Thursday.
I posted the correct info on the Malibu thread that I started. Link is below.