I just finished building a 4L80 to go behind my TBI SBC that some of you have seen on here.

I need to figure out how I'm going to make this thing shift.

I have a 7427 running $0D and I'd like to keep that becuase Ive already set it up to log wideband data and control an E-fan. So...... What is the best way to shift this 4L80? I see several possible avenues:

1. Modify the 7427 $0D so that it can command the 4L80 (maybe?)

2. Add a second 7427 piggyback style running $0E that is just a standalone trans controller

What's going to be the easiest way to shift this 4L80 electronically?