Strengthen your chassis with our Frame Stiffener Kit, designed to reduce flex and improve handling. Made from heavy-duty 3/16″ steel, these boxing plates feature a bolt-in design for easy installation—no welding required. Perfect for performance builds, this upgrade adds serious rigidity to your frame for improved suspension response and overall drivability.

Features

• 3/16 Steel Construction
• Uses Factory Holes to Locate
• Adjustable Transmission Mount
• Works With 1 & 2 Piece Driveshafts
• Boxes Your Frame Rails
• Ability to Run up to 3 1/2″ Exhaust

Includes

• Transmission Crossmember & GM Polyurethane Mount
• Grade 8 Hardware
• Boxing Plates
• Frame Stiffener

Application

• 2WD 73-87 Chevy/GMC
• C10, Short Bed Trucks
• GM Transmissions (T350, T400, 700R4, 4L60, 4L80, 6L80, Tremec Manual)

Technical content and installation guidance provided by the Level 7 Motorsports team.

https://youtu.be/hg-9395LSR0?si=so_4jCFE2p9uYCP9

Video Summary: Chassis Preparation, Frame Stiffening & Suspension Planning

In this episode, Jesse from Level 7 Motorsports begins preparing the chassis for the complete suspension installation on a 1967–1972 Chevrolet C10. Rather than immediately installing parts, the focus is on properly preparing the frame, increasing chassis rigidity, and laying the groundwork for a suspension system that performs as intended.

The video begins with metal finishing techniques used to remove light surface rust and prepare the factory frame for fabrication and final coating. Jesse explains the difference between metal finishing in manufacturing versus fabrication, demonstrates the tools used to remove welds and imperfections, and shows how Gibbs Oil is applied to protect the bare steel while mock-up work continues.

Attention then shifts to the truck's turbocharged LS engine, highlighting several carefully selected components designed for both reliability and performance. Jesse walks through the carbon fiber intake manifold, Nick Williams cable-operated throttle body, Motion Raceworks throttle bracket, Radium fuel system components, Holley water pump, Powermaster alternator, Turn One performance power steering pump, Lokar billet dipstick, and a custom remote-mounted GM MAP sensor solution. Throughout the discussion, he explains why each component was chosen and how they contribute to a cleaner, more serviceable engine package for a high-performance street and track truck.

The primary focus of the episode is the installation of the Tin Works inner frame stiffener system. Jesse explains how the bolt-in reinforcement dramatically increases chassis rigidity by reducing frame flex and torsional twist. The system uses laser-cut inner boxing plates, precision-engineered reinforcement brackets, a transmission crossmember, and rear cross bracing to transform the factory C-channel frame into a much stronger foundation for modern suspension components.

Detailed installation tips are provided throughout the process, including locating the reinforcement plates using factory reference points, accurately marking and drilling mounting holes, deburring the frame, and using step drill bits to produce clean, precise holes. Jesse also discusses the importance of quality instructions, properly labeled hardware, and thoughtful product engineering that simplifies installation for customers.

After completing the installation, the chassis is left ready for the next phase of the build, where ride height, suspension geometry, and Ridetech suspension components will be mocked up and finalized. Jesse also previews an additional rear frame stiffener that will be installed once suspension clearance is confirmed.

Whether you're restoring a classic C10, building a Pro Touring truck, or simply looking to strengthen your factory chassis before adding modern suspension components, this video provides practical fabrication techniques, installation guidance, and valuable insight into the engineering decisions that create a stronger, better-performing foundation for any high-performance build.

3 - 4 Week Lead Times Typical