I have a 2005 Tahoe I had the transmission rebuilt and drove it for a week now the brake light is on and it will not shift gears.
Most reputable shops will give you a year or 12000 mile warranty on the rebuild. Take it back to the shop for repair.
As Tom said, TAKE IT BACK!
I took it back the transmission is fine it's a wiring problem nothing to do with the work that was done on the transmission.
If it will not shift gears there is a transmission problem, be it mechanical, hydraulic or electrical.
After some research and some checking it was a bad ground to the brake switch.
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