Change automatic ecm with manual trans file

[Killerram2500]

Anybody out there that can help me with the process of changing an automatic ecm to a manual trans.

[GMPX]

You have to use a manual transmission base tune, there is no simple 'auto or manual' switch.
What ECM type / year you are dealing with?

[Killerram2500]

2008 ecm

[Killerram2500]

I`m using the manual ecm right now from the donor truck. But it has a different vin of course.

[GMPX]

So read the manual ECM, flash that file in to the auto ECM, no need to worry about VIN's then.

[Killerram2500]

Ok thanks , I will try out...……….