BAKFlip MX4 1999-2014 GMC Sierra 2500/3500 6'6" Tonneau Cover 448101

BAKFlip MX4 1999-2014 GMC Sierra 2500/3500 6'6" Tonneau Cover 448101

Regular price $1,199.99
$1,199.99 Sale price Regular price $1,559.99

Material: Aluminum

Cover Action: Folding

Cover Firmness: Hard

Color: Matte Black

Weight: 71 lbs.

Dimension (L x W x H): 81 x 23 x 9 in.

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Product Details

BAKFlip MX4 448101


  • Heavy-duty aluminum construction
  • Sleek matte-black finish
  • Extra-strong prop rod clips for a secure hold
  • Folds toward the bulkhead for 100-percent bed access
  • Premium rubber bumpers protect the cab when folded into the upright position
  • Simple no-drill installation
  • Weather-resistant EPDM seals and end caps
  • 400-lb. Weight capacity
  • Includes drain tubes (may require drilling on certain applications)
  • 5-year warranty


Experience the BAKFlip MX4, a truck bed cover that boasts a range of impressive features. With matte-finished cab corner caps, clamps, and elevator bolts, the MX4 exudes a streamlined and polished appearance. It also includes pre-molded, die-cut, shock-absorbent bumpers and secure prop rod clips, enhancing its functionality.

Designed to withstand extreme conditions, this heavy-duty, all-season truck bed cover delivers reliable performance day in and day out. The MX4 features a resilient infrastructure, with upgrades to prop rod clips, rails, elevator bolts, and A-panel and B-side bumpers, ensuring enhanced functionality and a complete matte-finish look and feel. Its solid and robust flush mount design adds to its appeal.

To provide you with added peace of mind, the MX4 comes with an extended 5-year warranty, emphasizing its durability and quality.

Price Guarantee

Lowest Price Guarantee

We work hard to ensure that the prices of our aftermarket truck bumpers are the best available online. That’s why we guarantee that you’ll get the lowest price on all of our bumpers and accessories. Here’s how it works:

  • We guarantee that the price of our aftermarket truck bumpers is the best available online. If you find an online store that offers a specific model at a lower price, let us know and we’ll match their price for your purchase.
  • If you find that the exact bumper at an even lower price online within 6 months after your purchase, we will refund you the difference. Simply send a price difference refund request to This applies even to the prices from our own store at
  • The competitor must be an online retailer with no physical stores and they must be an authorized dealer of the bumpers or accessories in question. The competing online store must also have the product in stock on their website for our price match guarantee to apply.
  • The price match guarantee does not apply to online marketplaces such as Amazon, eBay, Overstock or any other similar websites. The competitor must be selling the item directly on their own online store.
  • Additional promos cannot be applied in addition to the price match guarantee. For example, the free gift promo cannot be added on top of the price match guarantee. Only one promotion can be applied per purchase.

Once we confirm that your order is eligible for our price match guarantee, you can be confident that you’re getting the very best deal online.

Whether you’re looking for heavy-duty truck bumpers by Ranch Hand, a winch bumper by Fab Fours, or any other aftermarket truck bumper, if you shop with BumperOnly, you’ll never have to worry about buyer’s remorse.

For any questions about our price match guarantee, feel free to get in touch.

Shop without fear. Let BumperOnly take care of the rest.


      Installation Guide
      BAK INDUSTRIES comes complete with installation instruction. If you need assistance, call BAK INDUSTRIES Products Technical Support or bring it to your local auto body shop to install.

      Please click here to download installation manual.

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