Bed Floor Assembly - 5 inch WIDER Tubs - 88-98 Chevy GMC CK Short Bed Fleetside Truck

Premium Bed Floor Assembly for AMD Exclusive 5" Wider Wheel Tubs – 1988–2000 Chevy GMC C/K Shortbed Fleetside Pickup

The Premium Bed Floor Assembly for AMD Exclusive 5-Inch Wider Wheel Tubs is a purpose-built OE-style sheet metal solution engineered for 1988–2000 Chevrolet and GMC C/K Shortbed Fleetside pickup trucks, including C1500, C2500, K1500, K2500 (1988–1998) and C3500, K3500 (1988–2000) Silverado and Sierra models. This version is specifically modified to integrate with AMD’s exclusive 5-inch wider OBS wheel tubs, providing the clearance required for wider wheel and tire combinations while maintaining factory bed floor geometry.

AMD engineered these wider wheel tubs as a dual-purpose design, eliminating the need to produce multiple width versions. When paired with this premium bed floor assembly, the system allows builders to achieve up to a 3-inch wider tire footprint using compatible suspension configurations—without additional modification to the tubs or bed floor. For customers upgrading to a Detroit Speed 4-link system or equivalent rear suspension setup, the design supports up to 5 inches of additional clearance, maximizing wheel and tire width without requiring further customization to the bed floor or wheel tubs.

Manufactured on all-new AMD tooling, this premium bed floor retains original GMT-400 ribbing, cross sill structure, and mounting contours while incorporating revised inner profiles to align precisely with AMD’s widened wheelhouse geometry. The result is a seamless OE-style fit when paired with AMD’s wider tubs, delivering modern performance clearance while preserving factory-level fit and finish.

Constructed from heavy-gauge automotive steel, the assembly features correct factory-style rib stamping and reinforcement for strength and durability. Each unit arrives in a protective EDP coating, helping guard against corrosion during storage and preparation. Accurate stamping ensures proper alignment with factory bed sides, tailgate opening, and bed-to-cab spacing—critical for OBS truck restorations and performance builds.

This bed floor assembly replaces original GM part numbers 15646301 and 15611241, while delivering expanded wheel clearance capabilities for OBS Silverado and Sierra trucks. Designed for classic truck restorers and performance-oriented builders, this AMD-exclusive system provides structural integrity, OE-style appearance, and modern tire fitment flexibility in one integrated solution.

Auto Metal Direct continues to expand its OBS truck platform with precision-engineered sheet metal designed for enthusiasts who demand both authenticity and performance capability.

Key Features

• Premium OE-style bed floor assembly

• Designed exclusively for AMD 5" wider OBS wheel tubs

• Dual-purpose widened tub design

• Supports up to 3" wider tire footprint without additional modification

• Allows up to 5" additional clearance with compatible 4-link suspension setups

• Heavy-gauge automotive steel construction

• Produced on all-new AMD tooling

• Protective EDP coating for corrosion resistance

• Replaces GM part numbers 15646301 and 15611241

Vehicle Compatibility

Chevrolet

• 1988–1998 C1500

• 1988–1998 C2500

• 1988–1998 K1500

• 1988–1998 K2500

• 1988–2000 C3500

• 1988–2000 K3500

GMC

• 1988–1998 C1500

• 1988–1998 C2500

• 1988–1998 K1500

• 1988–1998 K2500

• 1988–2000 C3500

• 1988–2000 K3500

Notes or Fitment Clarifications

• For Shortbed Fleetside models only

• Designed specifically for use with AMD Exclusive 5" Wider Wheel Tubs

• Not compatible with OE-width wheelhouses

• Suspension configuration impacts final tire clearance

• Verify vehicle application and rear suspension setup prior to installation