The BAK BAKFlip MX4 is a hard-folding aluminum tonneau cover for the 2004-2013 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 5ft 8in bed. Its heavy-duty aluminum top panels are reinforced with high-density polymer cores for a 22 percent strength increase over the original MX4, and a patented automatic latching system secures the cover when it is closed. EPDM perimeter seals, tight-fit clamps and a dual-action tailgate seal keep water out, and the panels fold flush against the cab for full bed access. It installs on the factory bed with no drilling.
- Type: hard-folding tonneau cover
- Construction: heavy-duty aluminum top panels with high-density polymer cores, 22 percent stronger than the original MX4
- Finish: textured matte black
- Security: patented automatic latching system
- Weather protection: EPDM perimeter seals, tight-fit clamps and a dual-action tailgate seal
- Weight capacity: 400 lbs evenly distributed
- Bed access: folds flush against the cab for 100 percent bed access
- Bed length: 5ft 8in
- Install: one-person, no-drill
- Warranty: 5-year
- Part number: BAK448100
Vehicle Applications
Fits the 5ft 8in bed on the following:
- 2004 Chevrolet Silverado 1500
- 2005 Chevrolet Silverado 1500
- 2006 Chevrolet Silverado 1500
- 2007 Chevrolet Silverado 1500
- 2008 Chevrolet Silverado 1500
- 2009 Chevrolet Silverado 1500
- 2010 Chevrolet Silverado 1500
- 2011 Chevrolet Silverado 1500
- 2012 Chevrolet Silverado 1500
- 2013 Chevrolet Silverado 1500
- 2007 Chevrolet Silverado 1500 Classic
- 2004 GMC Sierra 1500
- 2005 GMC Sierra 1500
- 2006 GMC Sierra 1500
- 2007 GMC Sierra 1500
- 2008 GMC Sierra 1500
- 2009 GMC Sierra 1500
- 2010 GMC Sierra 1500
- 2011 GMC Sierra 1500
- 2012 GMC Sierra 1500
- 2013 GMC Sierra 1500
- 2007 GMC Sierra 1500 Classic
FAQ
What is the BAK BAKFlip MX4?
It is a hard-folding aluminum tonneau cover with a textured matte black finish for the 2004-2013 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 5ft 8in bed.
Does it fit my truck?
It fits the 2004-2013 Chevrolet Silverado 1500 and GMC Sierra 1500 with the 5ft 8in bed, including the 2007 Classic.
Can I still use the full bed?
Yes. The panels fold flush against the cab for 100 percent bed access, and the closed cover holds up to 400 lbs evenly distributed.
Does it require drilling to install?
No. It is a one-person, no-drill installation that clamps to the factory bed rails.

