Rear Frame Crossmember For 2014-2019 GM Pickups RB7398 Rust Buster FrameworksThe Rear Frame Crossmember for 2014 2019 Chevy Silverado and GMC Sierra 1500 models is prone to issues due to exposure to road salt, moisture, and debris. These can eat away at the rear crossmember, which supports the rear of the frame and often houses bumper mounts, spare tire hoists, and even hitch connections. It's not uncommon to see bumpers sagging, spare tires falling off, or trailers being towed with little more than scrap metal holding them