Aluminum Tunnel Kit - .040in Thick

The Aluminum Tunnel Kit - .040in Thick from CHASSIS ENGINEERING is a purpose-built transmission tunnel solution designed for custom fabrication, restoration, and high-performance vehicle builds. This kit addresses a critical structural and aesthetic element in frame-up restorations, engine swaps, and competition vehicle construction, where factory tunnels are unavailable, damaged, or incompatible with modern drivetrain configurations. Whether you're fitting a modern engine into a classic platform, upgrading transmission geometry for weight reduction, or building a street rod from the ground up, a precision-engineered tunnel kit eliminates weeks of hand-fabrication labor and ensures proper clearance and structural integrity from day one.

Manufactured from .040-inch aluminum, this tunnel kit balances strength with weight savings—a critical advantage in dedicated performance and vintage racing vehicles where every pound counts. The .040 gauge thickness provides sufficient structural rigidity for driveline vibration isolation and chassis flex resistance while remaining light enough to avoid the mass penalty of steel equivalents. Aluminum construction also simplifies welding compared to heavier gauges, allows for straightforward modifications during fitment, and resists corrosion in long-term storage or marine environments. The pre-formed geometry eliminates guesswork in centerline alignment and driveshaft geometry, reducing installation time and minimizing the risk of binding, vibration, or parasitic drivetrain losses caused by misalignment.

This kit is ideal for fabricators, restoration shops, and enthusiasts tackling frame-off restorations, engine transplants, or competitive builds where precision and repeatability matter. Installation requires welding to the vehicle frame and floor pan; proper fit depends on accurate measurements and alignment with your specific drivetrain layout. The compact packaged dimensions (19.4 x 18.5 x 36.8 inches, 16.8 lbs) make handling and transport straightforward, though final fitment must account for your vehicle's unique geometry, transmission type, and suspension configuration. Consult CHASSIS ENGINEERING documentation or your build specifications to confirm compatibility with your target platform before ordering.