I'm in a similar situation as he is, so what transmissions will work with a LS engine? I assume whatever came with it factory, but will there be some kind of trouble code, say if you ran a '05 5.3 with a '99 4L80e ? You mentioned a few abbreviations that I am unfamiliar with such as: pwm tcc. what are those?

I think you drive shaft question has a lot to do with your trucks layout ( Extended cab or regular, short box or long)

Thanks for the great info!