BAKFlip MX4 Hard Folding Tonneau Cover to suit RAM 2500/3500 6'4 Bed with RAMBox by BAK Industries
The BAKFlip MX4 is a hard folding tonneau cover designed to suit RAM 2500/3500 models with a 6'4 bed and RAMBox. It gives the tub a clean, low-profile look while adding practical protection for tools, camping gear, recovery equipment, and everyday cargo.
Built with aluminium panels and a full matte black finish across the top of the cover, the MX4 is made for drivers who want a strong, tidy-looking cover without a bulky appearance. The matte-finished cab corner caps, clamps, elevator bolts, rail end caps, and upgraded bumpers help give the cover a more complete, factory-style finish.
The folding design gives you quick access to the tub when you need it. The cover can be driven in the 2/3 open position or fully open position, giving you more flexibility when carrying taller or awkward gear. Upgraded prop rod clips help hold the cover securely when opened.
The MX4 also includes EPDM seals and upgraded seal end caps to help improve water resistance. Like most tonneau covers, it is designed to reduce water entry rather than make the tub fully waterproof, so sensitive gear should still be packed accordingly.
Installation is designed to be straightforward, with no drilling required for the cover itself. Drain tubes are included, although drilling may be required on some vehicles depending on the tub setup.
Why Upgrade?
The MX4 is a practical upgrade for RAM owners who want stronger tub coverage, cleaner styling, and better everyday usability than a basic soft cover. Its hard aluminium panel construction gives added protection, while the folding design keeps the tub accessible when you need to load larger items.
It is built for regular use, with upgrades to the prop rod clips, rails, elevator bolts, and bumpers to improve function and finish. For work, touring, or general weekend use, it gives the RAM tub a more secure and polished setup without overcomplicating access.
Features
- Hard folding tonneau cover designed to suit RAM 2500/3500 with 6'4 bed and RAMBox
- Aluminium panel construction
- Full matte black finish across the top of the cover
- Matte-finished cab corner caps, clamps, and elevator bolts
- Upgraded prop rod clips for a tighter hold
- Allows full bed access when opened
- Can be driven in 2/3 open or fully open positions
- Upgraded bumpers help protect the top of the cover when fully opened
- No-drill cover installation
- EPDM seals and upgraded seal end caps for improved water resistance
- Holds up to 400 lb of evenly distributed weight
- Upgraded mounting rail end caps for a finished look
- Multi-function tailgate seal
- Drain tubes included
- Made in the USA
Important Note
This version is listed for RAM 2500/3500 models with a 6'4 bed and RAMBox. Drain tube installation may require drilling on certain trucks, depending on the tub configuration.
Frequently Asked Questions
What bed and RAMBox configuration is this version designed for?
This cover (SKU UF-BAK-00038) is designed specifically for RAM 2500 and 3500 models with a 6'4" bed and RAMBox. If your RAM 2500/3500 does not have RAMBox, the correct part number is UF-BAK-00003. The RAMBox-specific version accounts for the different bed rail profile and clamp geometry created by the factory RAMBox storage system, so the two versions are not interchangeable.
Does fitting a tonneau cover restrict access to the RAMBox storage compartments?
The MX4 for RAMBox models is designed to mount on the specific rail profile of a RAMBox-equipped tub. The RAMBox compartments sit below the bed rail level in the bed sides and are not blocked by the tonneau cover being open or closed. However, the RAMBox lids open upward and to the side, and with the cover in place there may be a slight reduction in how far the lids can swing open. If you use the RAMBox compartments frequently, confirming the clearance for your setup before ordering is worth doing.
What is included in the box?
The kit includes the hard folding tonneau cover, side rails, mounting clamps, hardware, drain tubes, and an installation guide. All mounting components are included for a standard installation. Some vehicles may require minor drilling to route the drain tubes depending on the tub configuration.
How much weight can the MX4 support when closed?
The MX4 is rated to support up to 400 lb (approximately 180 kg) of evenly distributed weight across the closed cover. This is intended for gear laid flat across the panels, not concentrated loads or dynamic weight on a single section. For heavier or point-loaded items, storing inside the tub rather than on top of the cover is the better approach.
Can I drive with the cover partially or fully open?
Yes. The MX4 can be driven with the cover in a 2/3 open position, keeping the front section covered while leaving the rear exposed, or with all panels folded fully upright toward the cab for near full-tub access. Upgraded prop rod clips are designed to hold the cover securely when fully open. Always ensure the cover is properly secured before moving the vehicle.
How does this RAMBox version differ from the without-RAMBox version?
The RAMBox version (UF-BAK-00038) uses a different rail and clamp configuration that correctly seats on the modified bed rail geometry of a RAMBox-equipped tub. The without-RAMBox version (UF-BAK-00003) is designed for a standard flat bed rail profile. Both versions share the same panel design, features, and finish, but they are not interchangeable. Ordering the wrong version for your configuration will result in an incorrect fit.
How does the cover seal against rain and dust?
The MX4 uses EPDM perimeter seals on all panel edges and a dual-action tailgate seal at the rear to help manage water and dust ingress. Drain tubes are included to channel any residual water away from the tub floor. Like most tonneau covers, it is designed to significantly reduce rather than completely prevent water entry, particularly in sustained heavy rain. Gear that cannot tolerate moisture should be stored in waterproof packaging.
How does the MX4 compare to the Revolver X4TS rolling cover for a RAM 2500/3500?
The MX4 folds in sections and can be driven in a partially-open position for taller loads. The Revolver X4TS rolls toward the cab and includes integrated T-slot rails for mounting racks and cargo systems above the tub, which the MX4 does not support. If you regularly need over-bed rack space or want to run a cargo system above the tub, the X4TS is the more capable option. If you mainly need a secure, clean-looking hard cover without rack requirements, the MX4 provides a practical and cost-effective solution.
