2004 Tahoe trans problems.....

I just had my 2005 Yukon 4L60E rebuilt. Sounds like the same symptoms mine displayed. It started with a loud bang starting from a stop then no forward movement in D but I had reverse. It would go if I selected 1 or 2. The forward sprag was toast. So you are looking most likely looking at a rebuild or replacement.
 
Let's be honest - maintenance never fixes any serious mechanical issues.
Not so sure about that, or at least to the extent of the accepted definition of "mechanical issues". I have fixed blow by issue by some flushing and very short OCIs. I would say that is a mechanical issue, if not what would it be?

In an auto tranny, if the fluid is on the old side and not really doing its job, I have observed a fluid change and filter to fix a shirting issue. Perhaps it would call it a hydraulic issue more precisely?
 
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