Oh I see now. This is my first Duramax so wasnít sure if it was totally manual operation or what when in L. But from what you say it still functions as a automatic just will never go over the select gear of choice. Cool thanks.
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The great thing about doing this manual shifting is if your towing and you feel itís time to downshift all you gots to do is push the button to drop a gear or 2.
The Allison is smart but when it comes to towing it can be a little slow reactingq at times.
The same if your in a lower gear and you feel itís time to upshift, upshift manually, but never past 5th.
This is what most seasoned people do when towing with 20 years or 40 yrs experience, it doesnít matter
Just remember try to listen to your engine and the rpms and react when you think itís time, this will make a more pleasurable towing experience.
If your one of those guys that like to crank up the juke box while driving, then this advice probably will not work.
Itís amazing how many times I have to ask my wife to stop talking while traveling, one reason is I think I heard something I need to listen if thereís a problem, the 2nd is just for a little stop talking quiet time, please.