Background on the Car:
“Betty” is a 1967 GMC 7500 that originally served as a fire-service truck for Spring Lake Township Fire Department. We found her on Facebook Marketplace and bought her in March 2023. Today she is known as Betty RIG 314, or #bettyrig314 online.
This is a father-and-son build between Robert Wallin and his son, Marc. Most of the work was done at home, including fabrication, wiring, interior construction, suspension work, and custom body modifications. The frame was shortened nearly 4 feet and fitted with a 1996 LWB Chevy bed while retaining the original 401 GMC Magnum V-6, NP541GL five-speed, and heavy-duty drivetrain.
Betty isn’t perfect, and that was never the goal. We intentionally kept the dents, scars, and character from her years in fire service. Somehow, at every show she attends, she always seems to become a crowd favorite.
She is driven approximately 500-800 miles per year, primarily to local car and truck shows.
Name: Marc Wallin
Vehicle Year/Make/Model: 1967 GMC 7500
Built By: Robert & Marc Wallin
Engine: 401ci GMC Magnum V-6
Engine Details: Original, top end rebuilt
Transmission: NP541GL five-speed manual
Chassis and Suspension Details: Frame shortened nearly 4 feet, original heavy-duty chassis, rear springs reduced seven leaves per side
Wheels & Tires: Original wheels, 295/75R22.5 front, 9.00-20 rear
Interior Details: Wood, diamond plate, custom gauges, skull shifter
Body and Paint Details: Flat hot-rod black, 1996 LWB Chevy bed, original scars retained, gears-inspired industrial theme
Awards: Youth Choice, C1 Cams & Chrome Car Show, June 2026; People’s Choice, Chickamauga Down Home Days 2026; Best Special Interest, Chickamauga Down Home Days 2025; Top 2 Big Rigs, Labor Day at The Post Car Show, 2026
