This seems really simple to me, everything is the exact same besides the turbo setup, stock fuel pump, stock tune, stock injectors, still running a MAF. The only thing you have changed since the turbo setup is the o2 sensors locations and whatever weird wiring idea you came up with. Just fail your 2 rear o2's and unplug them. Put your 2 primary o2's off each sides manifolds and wire them up stock, don't move the pins around in the ecm. Fire it back up and report back. My money is on that.

 

Yep.... my thoughts and I agree with this guy

 

Are you trying to use the rear o2s? We usually just delete them out. ^^ These guys^^. I don't know how you have your turbo ran but you should use the forward 02s in nears stock locations. Hell I built my cousins truck on a "real" budget build. We re-used the 2.5" tubing under the truck and used factory o2 locations. Works Great. Only thing we ever spliced was MAP wires for old school brick map because Autozone, O'Reily's and Napa couldn't get their heads out of their butts and order us a plug and play sensor. Tried for 2 weeks and they kept sending 1 Bar maps. Someone mentioned on here a boost refrence regulator but I think the truck injector rails regulator is 1 to 1. Hope someone corrects me if I'm wrong.
Good luck on getting your transmission to hold, not saying it won't but I wouldn't zero out all your torque management, especially being awd. I can't believe GM didn't put an 80e behind their SS. We burned up the 60e in my cousins truck in 1 afternoon. You should post pics of your set-up.

 

Ok, welded a bung in the left side crossover pipe just after the manifold put the 02 in and it runs fine now as long as i dont get close to boost, the way I had it wired was basically like both 02's were in the downpipe, I left the right side in the downpipe and it seems to be fine, thank you guys for all the help. Im sure ill have more questions and problems as this is my first venture like this, im dreading the tuning part lol, again I appreciate it!

 

Figured it had to be o2 sensor related. Glad you got it figured out. I'd still move the right side o2 out of the downpipe and and put a bung in right after the manifold and you can use the bung in the downpipe for a wideband o2 sensor for down the road when you add a wideband.

 

Ive been here before! The O2 sensors need to see some differential between bank 1 and bank 2. When you run both sensors in the same bank (or in the up pipe like I did) the ECM hates it and you get a rich condition. The codes I got were "bank 1 rich bank 2 lean" which confused the living **** out of me until someone who new what they were doing straightened me out. It'll run best with one O2 sensor in the left bank and one in the right, from what you've described (even after your changes) one sensor is seeing 4 cylinders and the other is seeing 8.

 

"I left the right side in the downpipe and it seems to be fine,"

Nope. What Schraders said^^^^

 

That is what mine was doing.