I have an automatic cobalt ss 2.4
The transmission (4t45e) on stock tune settings seems to have a very firm shift from 1 to 2 when set in L and t/c is off. I've since changed the transmission settings to have more exact shifts and increaded the tcc duty cycle. The thing is when I now set it in L to set off for a blast it uses a seemly very weak shift pressure when going from 1 to 2. However if I leave it in D and put the handbreak on one notch to disable TC the shift is nice and firm.
Anyone have an idea why the shift pressure in L became weak? Other than that small problem I couldnt be happier with the settings I've worked across.
My only last suspicion is that its in the upshift br/pwrOn table
Attached are the tables I changed.
(also shift lock is enabled)
tcc-max is at 100%