4l80 to transfer case adapter piece. this is the star looking part only, like this, no hardware included, $125.00
raceprovenmotors.com
Transmission Adaptor - 4L80E SYTY - Race Proven Motors
Allows one to bolt up the factory BW-4472 transfer case to the late model heavy duty 4L80E transmission. Complete with counter bored holes, factory centering collar and square O ring groove.
raceprovenmotors.com