Shifting smoothness on new truck

Streetdaddy · May 28, 2022

Ok.. so apparently if you put it in L9 you can disable the dfm feature. Seems to get rid of the slight shuddering of the dfm system. Just learned this so will need to drive it a bit more to give an opinion

jconner00 · May 28, 2022

Put it in L9? what does that mean? newbie here expecting delivery soon

Streetdaddy · May 28, 2022

LOL I just learned myself. It’s a mode on the shifter . Put in L and toggle up to 9 on paddle shifters

jconner00 · May 28, 2022

Streetdaddy said:
LOL I just learned myself. It’s a mode on the shifter . Put in L and toggle up to 9 on paddle shifters

interesting! You just do that once? Or every time you start the truck?

Streetdaddy · May 28, 2022

Every time

jconner00 · Oct 27, 2023

Is anyone else with the 2022.5+ model 1500 still having shifting issues? Mine is over 7K miles now and still has a rough shift and shakiness around 40-50 mph as if it cannot find the correct gears. It does this in L9 or normal Drive. Has anyone had their transmission control module replaced as this article says:

https://gmauthority.com/blog/2023/01/gm-releases-fix-for-2022-gmc-sierra-poor-transmission-shift-quality/