Peterbilt 387 Mud Flaps

Frequently Asked Questions About Peterbilt 387 Mud Flaps

What are the exact mounting dimensions and will these mud flaps fit my specific year Peterbilt 387?

Our Peterbilt 387 mud flaps are designed to fit model years 2000-2010 with standard mounting brackets. The mounting holes are spaced at 2.5 inches center-to-center for the top bracket and accommodate both single and dual rear wheel configurations. For 2011 and newer models, you may need adapter brackets due to slight frame modifications. We recommend measuring your existing bracket spacing or contacting our support team with your OEM for exact fitment confirmation.

What material options are available and how do they hold up in extreme weather conditions?

We offer three material options for Peterbilt 387 mud flaps: heavy-duty rubber (3/8" thick), anti-sail polymer composite, and stainless steel backed rubber. The rubber flaps maintain flexibility down to -40?F and resist cracking in extreme heat up to 180?F. The anti-sail polymer options are 25% lighter than rubber and include internal weights to prevent flapping at highway speeds. Based on customer feedback, the stainless steel backed options last 2-3 times longer than standard rubber in heavy salt and gravel conditions.

Do I need any special tools or additional hardware for installation?

Installation typically requires basic hand tools: a 9/16" socket wrench, drill with 3/8" bit (if adding new mounting points), and a torque wrench. All necessary mounting hardware is included with each set, including grade 8 bolts, lock washers, and backing plates. Installation takes approximately 30-45 minutes per side. Some customers report needing longer bolts for aftermarket brackets - we include both standard 2" and extended 3" bolt sets to accommodate various configurations.

What sizes and styles are available for the Peterbilt 387?

We stock Peterbilt 387 mud flaps in three standard sizes: 24" x 24" for single wheels, 24" x 30" for dual wheels, and extra-wide 24" x 36" for lowered trucks or those requiring additional coverage. Style options include plain black, chrome embossed Peterbilt logo, reflective DOT tape borders, and custom laser-cut designs. Quarter fender flaps are also available in 12" x 18" and 14" x 20" sizes for complete protection.

How do these mud flaps affect fuel economy and are they DOT compliant?

All our Peterbilt 387 mud flaps meet or exceed DOT requirements for spray suppression. The anti-sail design options can actually improve fuel economy by 0.5-1% according to customer reports, as they reduce drag compared to traditional flapping mud flaps. Standard rubber flaps have minimal impact on fuel consumption when properly installed. All flaps extend to within 8 inches of the ground when loaded, meeting federal requirements while providing maximum protection.