73-87 Frame Stiffener

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)

73-87 Frame Stiffener Install Video