HomeAll RepliesReply To: When will GM put 8-speed automatic behind 5.3L? Reply To: When will GM put 8-speed automatic behind 5.3L? Sponsored February 23, 2015 at 12:45 pm #86532 Z15Participant 2016 Models is what has been stated in the past. I know someone who got a new 8-sp trans and he has had nothing but problems from it. The dealer has had it more than he has. Sponsored Subscribe to GM Authority For around-the-clock GM news coverage We'll send you one email per day with the latest GM news. It's totally free. First Name Last Name Email Address Subscribe via Email Leave this field empty if you're human: Sponsored