Premium OBS Bed Floor Assemblies for 1988–2000 Chevy & GMC Shortbed Trucks

The GMT-400 OBS truck platform continues to dominate the classic truck market — and Auto Metal Direct is raising the bar once again with the release of two purpose-built Premium Bed Floor Assemblies for 1988–2000 Chevrolet and GMC C/K Shortbed Fleetside pickups.

Whether you're restoring your Silverado or Sierra back to factory specs or building a pro-touring OBS with serious tire under it, AMD now offers a precision-engineered solution built on all-new tooling.

OE-Style Premium Bed Floor Assembly

Part # 790-4088-6S

For restorers who want factory-correct fit and appearance, the OE-style Premium Bed Floor Assembly delivers authentic GMT-400 rib stamping, correct cross sill structure, and accurate mounting contours.

Designed to replace original GM part numbers 15646301 and 15611241, this assembly installs with OE-width wheelhouses and maintains proper alignment with:

• Factory bed sides
• Tailgate opening
• Bed-to-cab spacing
• Original mounting points

Manufactured from heavy-gauge automotive steel and finished in a protective EDP coating, this bed floor offers long-term durability while preserving original geometry for a clean, correct restoration.

Pair it with AMD's OE-style wheel tubs (X770-4088) for a complete factory-style OBS bed rebuild.

Performance-Ready: Premium Bed Floor for AMD Exclusive 5-Inch Wider Wheel Tubs

Part # 790-4088-6S (Modified Version for Wider Tubs)

AMD 5-Inch Wider Wheel Tubs – Part # 760-4088-4

For builders pushing the limits of stance and tire width, AMD engineered a dedicated bed floor assembly specifically designed to integrate with its Exclusive 5-Inch Wider OBS Wheel Tubs.

This is not a modified OE panel — it is purpose-built to align with AMD's widened wheelhouse geometry while retaining factory ribbing and structural integrity.

What Makes It Different?

AMD developed a dual-purpose 5-inch widened tub design, eliminating the need for multiple width variations. When combined with this premium bed floor:

• Supports up to 3 inches wider tire footprint using compatible suspension setups
• Allows up to 5 inches of additional clearance when paired with Detroit Speed 4-link or equivalent rear suspension systems
• Requires no additional modification to the tubs or bed floor

The result is a seamless OE-style appearance with dramatically expanded wheel and tire capability.

For OBS builders chasing modern performance without sacrificing structural correctness, this system changes the game.

OE-Style vs. 5-Inch Wider – Which One Is Right for Your OBS?

• Factory Restoration: 790-4088-6S (OE Version) with X770-4088 OE-Style Wheelhouses
• Street Performance: 790-4088-6S (Wider Tub Version) with 760-4088-4 AMD 5-Inch Wider Tubs
• Pro-Touring / 4-Link Build: Wider Tub Bed Floor with 760-4088-4 5-Inch Wider Tubs

If you're retaining stock suspension and factory tire width, OE-style is the right choice.

If you're upgrading suspension and maximizing rear tire clearance, the AMD-exclusive wider system delivers unmatched flexibility.

Built on All-New AMD Tooling

Both bed floor assemblies are manufactured using brand-new AMD tooling to ensure:

• Accurate factory-style rib stamping
• Proper cross sill reinforcement
• Correct structural geometry
• Precise bed side and tailgate alignment

Constructed from heavy-gauge steel and finished in corrosion-resistant EDP coating, these assemblies are designed for both long-term restorations and high-performance builds.

Vehicle Compatibility

Chevrolet & GMC C/K Shortbed Fleetside Models:

• 1988–1998 C1500
• 1988–1998 C2500
• 1988–1998 K1500
• 1988–1998 K2500
• 1988–2000 C3500
• 1988–2000 K3500

Shortbed Fleetside models only.

Complete Your OBS Bed Rebuild

To ensure proper fitment, verify your build configuration before ordering:

• OE-style bed floor pairs with OE-width wheelhouses (X770-4088)
• Wider tub bed floor must be paired with AMD Exclusive 5-Inch Wider Wheel Tubs (760-4088-4)
• Suspension setup impacts final tire clearance

Whether you're restoring a clean Silverado or building a wide-tire OBS street machine, AMD continues expanding the GMT-400 platform with precision-engineered sheet metal designed for enthusiasts who demand both authenticity and performance capability.