LS4 Performance - Won't start

I'm finishing up my transmission swap and just got to the point where to start it up. Put the key and the display starts saying to service abs, brakes, stability... When I try to start nothing. So I figure it's related. Anyway I think I got everything hooked up, wheel sensors and the few transmissions sensors. Any ideas?

go back and check the PRNDL switch you probably didnt seat the connector it happended to me when i replaced my trans also check your started and make sure all your wires are going were there supposed to and tightned

That's the big connector on the top correct? That seems good, I'm taking the starter to get tested to make sure it didn't get beat around

Also check and make sure everything is grounded nice and good , had similar problems when I had a ground for the tranny comes loose

Everything seems good I got 4 grounds going to the trans. What would I look for If my computer is shot? Had it retuned for the transmission as well

With the car off should it know what gear it's in. If I shift it it's still saying its in park

Well ended up being a broken ground on the passenger side, must of broke when I jacked up the motor

Glad u you figured it out , let us know how it rides

feels like a new car. i can really tell my rpms dropped when cruising around, so its got a lot less slip in it... before it felt like i was driving around with a huge stall.