How much should I charge to rebuild a transmission in a 2004 chevy Silverado

Also some more things to consider : Is it for a friend? ; are OEM parts being used?; do I want to STAY friends with them?

Helpful info needed: labor only.... Did you remove the transmission, and if so was it 4x4?.. Also depends on any upgrades to valve body or other labor consuming repairs... There are different levels of transmission repair that are often called a rebuild!..