The trans mission IS probably going out. This is a well know defect in the 2002 Tahoe. Google it.
That would be the 4L60E transmission.
That would be the 4L60E transmission.
That would be the 4L60E transmission.
That would be the 4L60E transmission
That would be the 4L60e transmission.
That would be a 4L60E transmission.
That would be a 4L60E transmission.
That would be a 4L60E.
That would be the 4L60E
Your motor oil going bad would cause that. That is in the crankcase, not the transmission.
That would be a 4L60-E transmission.
That would be the 4L60E transmission.