Part 448133 brings BAK's BAKFlip MX4 design to the 2020-2026 Chevrolet Silverado 2500/3500 and GMC Sierra 2500/3500 with a 6'9" bed. It is a hard folding tonneau cover, so you get lockable cargo protection and a bed that opens up when the job needs it.
The BAKFlip MX4 is BAK's step-up folding cover. This Gen 3 version adds stronger panels, a tighter seal and a re-engineered auto-latch.
Silverado and Sierra beds haul everything from job-site materials to weekend gear, which is where a cover that locks and still opens fully earns its keep.
Textured matte black, flush to the rails. The finish carries across every component, and the cover sits flush with the bed rails, so it looks right whether it is open or closed.
Fold it up and haul. The cover folds forward and upright against the cab, with prop rod clips holding it in place and rubber bumpers protecting the cab. You can drive with it folded open, and the third brake light is not blocked in any position.
Gen 3 strength. The top panels are multi-layer aluminum over a high-density polymer core and are 22% stronger than the original MX4, while precision-engineered aluminum side rails and frame keep the cover rigid. It is rated for 400 lb of evenly distributed weight.
More for rain and road spray to get past. Updated EPDM perimeter seals, tight-fit clamps, a longer dual-action tailgate seal on most applications and an integrated drainage system all work to keep the bed dry.
Auto-latch security. The patented auto-latch engages the moment you close the cover, so there is no separate locking step to forget. Re-engineered latching panels and lock components improve forced-entry resistance compared with the previous generation.
Fit notes: It is not compatible with factory bed storage boxes. Also match the bed length shown in the fitment line above.
Assembled in the USA and covered by a five-year limited warranty, the BAK 448133 is the Gen 3 upgrade for owners who want a stronger, tighter-sealing folding cover. Order it from Track Ready Products and check the bed length above.
The Gen 3 click-in mounting makes this a one-person job, typically 30 minutes or less, with no cutting, trimming or drilling on most trucks. Clamps and hardware are included.
Start with a clean set of rails. Position the cover, tighten the clamps evenly, and run it through a full open and close cycle to check that it moves freely and latches.
After the first week of driving, recheck the clamps and retention hardware for tightness, and check them again now and then. Wash with mild automotive soap and water, keep the cover secured at all points while driving, and clear snow and ice before opening.
