Well after a bit of stuffing around (for some reason my APU1 refused to work with my PCM) I ended up burning a chip to apply the changes.
I only changed the 3-4 and 4-3 tables and the Yukon accelerates much better up the on ramp with the delayed 3-4 shift.
The only thing is the gear change and TCC look to be at the same time, where as before there was quite a delay before the TCC would lock. I'm wondering how hard that will be on the TCC clutch?
I can't find any tables to create a TCC delay after upshift and delay before downshift after TCC unlock, any help would be appreciated.
I have a 95 trans with a PWM TCC if that makes any difference?