Peterbilt 389 Glider Mud Flaps

Frequently Asked Questions About Peterbilt 389 Glider Mud Flaps

Will these mud flaps fit my Peterbilt 389 glider kit truck?

Yes, these mud flaps are specifically designed for Peterbilt 389 glider models from 2007 to present. They mount using the same bracket holes and hardware locations as factory mud flaps. However, if your glider has aftermarket fenders or custom modifications, we recommend measuring your fender clearance first. Standard mounting requires 24-30 inches of clearance from the bottom of the fender to the ground.

What's the difference between rubber and stainless steel backed mud flaps?

Rubber mud flaps are more economical and provide excellent road spray protection, typically lasting 2-3 years with regular use. They're lighter weight and easier to install. Stainless steel backed mud flaps feature a polished or brushed metal plate bonded to heavy-duty rubber, offering superior durability and a premium appearance. While they cost more upfront, they often last 5+ years and maintain their appearance better in harsh conditions. Both styles meet DOT requirements for splash protection.

Do I need special tools or brackets to install these mud flaps?

Installation typically requires basic hand tools including a socket set, drill with metal bits, and mounting hardware. Most mud flaps come with universal brackets, but Peterbilt 389 gliders often have existing mounting points that accept standard brackets. If your truck lacks factory mounting holes, you'll need to drill new ones. Anti-sail brackets are recommended for mud flaps over 24 inches wide to prevent wind flutter at highway speeds. Installation usually takes 30-45 minutes per side.

How do I choose the right size mud flaps for my truck?

Measure from your fender's lower edge to the ground with your truck at normal ride height. Subtract 6-8 inches from this measurement to determine your maximum mud flap length. Standard widths for Peterbilt 389s are 24 or 30 inches, with 24-inch being most common for single rear axles and 30-inch for tandems. The bottom of your mud flaps should hang 6-8 inches above the road surface to meet most state regulations while preventing excessive wear.

Are weighted mud flaps worth the extra cost for highway driving?

Weighted mud flaps contain a heavy rubber compound or metal inserts along the bottom edge, reducing flutter and sail effect at speeds above 55 mph. For trucks that primarily run highways, they're generally worth the 20-30% premium as they last longer and maintain better road spray control. Standard mud flaps work fine for local and regional hauling under 55 mph. If you experience mud flap damage from wind flutter or frequently replace torn flaps, upgrading to weighted versions typically pays for itself within a year.