Noobie with HP Tuners - 09 Sierra L9H - Tow haul mode?

[Brettworth]

Working on a 2009 Sierra with the 6.2 L9H w/6L80

How do you determine what Pattern Normal, A, and B are?

Tow/Haul mode is great when hauling a massive amount of weight, but when I'm looking for something for snowmobiles or a boat - it's waiting too long to shift.

Any help would be spectacular!

Thanks!

[JasonHD]

Looking at the upshift/downshift speeds in relation to throttle % allowed me to determine mine. Pattern A for 2012-2015 should be tow haul. I would assume it would be the same on the 09, but I would have to look.

Edit -- Just checked a 2009 6.2l stock file. Pattern A is your tow haul mode.

[Brettworth]

Thank you Good Sir.