4x4
4l60e running perfect making merge on freeway got to 50mph lost accelleration engine running fine, but feels like there is no transmission coasted to side. checked fluid, fine, up to level and nice and red no metal in fluid no leaks underneath no codes on engine computer no flashing lights tried to engage 4wd. 4wd light lit up, but no change truck won't move put it back into 2wd. light lit up. no move
before I go to the mercy of a transmission shop anything I should look for or check? Could it be the transfer case? Somethin in the electronic 4wd shift gizmo? What to look for or check?