G GSMSR New member Joined Aug 10, 2019 Messages 2 Reaction score 0 Points 1 Jul 7, 2021 #1 I have a 2011 Sierra with a 6L80E transmission. It has 126k on it. I have had it about 2 years now. I am not sure when or if the previous owner ever serviced the trans. Would it be good to flush the trans?
I have a 2011 Sierra with a 6L80E transmission. It has 126k on it. I have had it about 2 years now. I am not sure when or if the previous owner ever serviced the trans. Would it be good to flush the trans?
