Peterbilt 359 Mud Flaps

Frequently Asked Questions About Peterbilt 359 Mud Flaps

What are the exact mounting dimensions and will these mud flaps fit my specific year Peterbilt 359?

Our Peterbilt 359 mud flaps are designed to fit all model years from 1967-1987 with standard mounting brackets. The mounting holes are spaced 2.5 inches apart center-to-center, compatible with both single and tandem axle configurations. For custom exhaust setups or modified fender brackets, you may need to drill additional mounting holes. We recommend measuring your existing bracket spacing before ordering to ensure proper fitment.

What material options are available and how do they hold up to road chemicals and weather?

We offer three primary materials: heavy-duty rubber (3/8" thick), anti-spray polymer composite, and stainless steel backed options. The rubber flaps resist cracking in temperatures from -40F to 180F and withstand road salt, oil, and diesel exposure. Polymer composite flaps offer 30% better tear resistance than standard rubber and maintain flexibility in extreme cold. All materials are UV-stabilized to prevent fading and deterioration from sun exposure.

Do I need special tools or brackets for installation, and how long does it typically take?

Installation requires basic hand tools: a socket wrench set, drill with 3/8" bit (if adding holes), and mounting hardware which is included with most sets. Standard installation takes 30-45 minutes per set. Original factory brackets can typically be reused, but we offer replacement bracket kits if yours are damaged or missing. The mud flaps come with stainless steel bolts, washers, and lock nuts rated for highway vibration.

What sizes and styles are available for different truck configurations?

We stock mud flaps in 24" x 30" (standard), 24" x 36" (extended), and 30" x 36" (wide load) sizes. Style options include plain black, white lettering with Peterbilt logos, chrome weights, and reflective tape borders. Quarter fender flaps are also available in 12" x 20" for tight clearance applications. Custom die-cut designs and company logos can be added with a 2-3 week lead time.

Will aftermarket mud flaps affect my ground clearance or cause issues with tire chains?

Our mud flaps are designed to maintain DOT-required ground clearance of 6-8 inches when properly installed. The anti-sail design with weighted bottoms prevents excessive flapping that could interfere with tire chains. For trucks running wide-base singles or oversized tires, we recommend our adjustable mounting brackets that allow 2-4 inches of height adjustment to maintain proper clearance while meeting state regulations.