NEED HELP 2005 Trailblazer Transmission Problems

[SarahsChevy]

Hi! Any help here is appreciated. Replaced a 2005 Chevy trailblazer transmission with a 1999 Chevy Tahoe transmission. (Since both vehicles are compatible for transmission 4L60E).

I used all the original transmission plugs and the original bell housing, but I replaced the torque converter to match the trailblazer.

Now I am getting the following error codes (Have power on both sides of fuse 47.)

P0740
P0743
P0745
P0750
P0780
P0785
P0753
P0758
P1860
P1810

 

[Sparky]

Double check your connections. Make sure your power feed and ground are both good. Basically, the computer can't see your transmission.

 

[cornchip]

Is a 1999 4L60E transmission even compatible in a 2005 assuming it's a 5.3?