Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner

gear loss

  1. Transmission slipping and losing gears

    4x4 Drivetrain
    Recently my 2003 Trailblazer (4.2 V6) transmission lost power while driving on the freeway. I decided to do a full tune up on the vehicle in hopes that it would fix the problem. I changed the transmission fluid and filter and replaced the spark plugs. For two days, my car was running like a...