I just traded in my 22 refreshed AT4 6.2 for a 2025 AT4X with the 6.2. I decided I didn’t want to roll the dice on the recall. I have been a DFM and then AFM hater for a long time. I used the Range disabler on my 2015 and 2018 Sierra 6.2s and when no longer effective on the 22 refresh I drove around in L9. Every time I start out I go through a flow like I am starting an airplane…shifter M, paddle up to 9, start/stop button off. I didn’t do this for engine durability, I have been told the lifters will fail despite this and I never keep them that long anyway. It was the bogging down, hesitation and slight vibration I felt when kicking in that I hated. But for the life of me I cannot hear, feel or otherwise notice it on the new truck. Even in “sport mode” with the exhaust opened up I notice nothing. Either it is not engaging in this truck or they really improved it. No more L9 for me. Now the start stop…..
