my 2008 avalanche z71 has sticky rear door handles and are very difficult to open the rear doors a one handle came right off

Sounds like your Avalanche was recently repaired, prior to your ownership. I never had a issue with mine, but my take on this would have to be... go to a collision shop, and have them replace the handles. I doubt it would be that much, but if you have a child, its better to get it fixed now than to pay for the mistake later.

Trish, I'm sorry to hear that you are having this issue. Would you like for me to research some options that may apply to this concern? All I would need is your VIN # to start. I look forward to your response and assisting you. Marlea Wilson GM Customer Service