Other than spending another $3500 to fix again. My mechanic has been saying hes on his way to my house to diagnose for 3 days now but three days later hes not here yet. He is wai ting for his new space as he was forced to move his shop due to a sale of the building he was in. Meanwhile the transmission (4l60) he rebuilt for my denali ten months ago is not going into 3rd gear all of a sudden..stuck waiting as he gave me a 1 yr warranty. I posted this elsewhere in the forums but i havnt got any response. Im looking for any tips and im new on the site so its also a HELLO!!...new guy here and my problem is the 04 denali xl that i actually really love, im just not sure why.