Installing half fenders on a semi-truck requires precise alignment, proper clearance checks, and rigid frame mounting. In this technical walkthrough, TwinStick Garage demonstrates the installation of Class 8 Manufacturing stainless steel half fenders on a Peterbilt 359 chassis.
This video covers the complete installation sequence from initial mock-up to final hardware torquing:
Setting Ride Height & Clearance: Airing up suspension to standard ride height to ensure a 5–7.5 cm (2–3 in) gap above tires, preventing fender damage during complete suspension dump.
Fender Mock-Up: Blocking and leveling the fender over the tire to determine front paddle and rear bracket frame locations.
Frame Drilling & Stump Mounting: Using a magnetic base drill with annular cutters to bore through multi-layer steel frame channels, securing threaded mounting stumps with threadlocker.
Paddle Fitment & Template Alignment: Utilizing the Class 8 hole template to mark, center-punch, and drill mounting holes cleanly through the stainless fender face.
Rear Support Arm Installation: Fastening the rear under-fender support bracket to the spring hanger and drilling mounting holes for flush-fit stainless carriage bolts.
Watch the full installation walkthrough above to ensure clean alignment and lasting durability on your rig.
Source: YouTube video