I have a 07 truck that had a odd os to begin with. Ever since my turbo and motor/trans swap i had to step back to a tune that was a different os to run my 4l80.
Now my maf is maxed and i want to do a cos3 for my truck but justin@bbp told me I could purchase a pedal and tac module from a 03 or 04 and a 2 bar gm map and then i could run a cos. So my question is since i bought a tac and pedal from a 03 do i need a base tune from a 3/4 ton truck to use as my starting point? I am not sure as most of this is new to me but i have been reading and learing and just wanted to know what i should look for or change to be able to run the cos in my truck.

Thanks in advance guys,
Chris