Kenworth T680 Mud Flaps

Frequently Asked Questions About Kenworth T680 Mud Flaps

Will these mud flaps fit my specific year model T680, and what about the T680 Next Gen?

Most aftermarket mud flaps for the T680 are designed to fit model years 2013-present, including both the standard T680 and the T680 Next Gen (2021+). However, there can be slight variations in mounting bracket positions between early models (2013-2016) and newer ones. Always verify the exact fitment by checking if your truck has the standard 2.5-inch or 3-inch mounting brackets. The T680 Next Gen typically uses the same mounting points, but double-check product descriptions for any specific exclusions.

What's the difference between rubber and stainless steel backed mud flaps, and which holds up better?

Rubber-only mud flaps are lighter, more flexible, and typically cost less, but they can curl, crack, or tear after 1-2 years of heavy use. Stainless steel backed mud flaps feature a metal plate bonded to the rubber, providing superior rigidity and preventing the curling issues common with plain rubber. While they cost more upfront, drivers report they last 3-5 times longer and maintain their appearance better, especially in extreme weather conditions. The added weight (about 5-10 lbs per flap) also helps them hang straighter.

Do I need to drill any holes for installation, and what tools are required?

Most T680 mud flaps are designed as direct bolt-on replacements using existing mounting holes, requiring no drilling. You'll typically need a socket set (usually 1/2" or 9/16"), and installation takes about 30-45 minutes for all four flaps. Some heavy-duty or oversized flaps may require drilling additional support holes. Anti-sail brackets, if not pre-installed, might need 2-4 drilled holes per flap. Always use stainless steel hardware to prevent rust streaking on your truck.

What size mud flaps do I need - 24" or 30" wide?

The standard width for T680 mud flaps is 24 inches, which provides adequate coverage for most tire configurations. Choose 30-inch wide flaps if you're running wide-base singles (445/50R22.5 or 455/55R22.5), have a spread-axle configuration, or frequently haul in states with strict splash suppression requirements. The length typically ranges from 24" to 36", with 30" being most common. Longer flaps provide better protection but are more prone to damage from backing over curbs or rough terrain.

How do I prevent mud flaps from flapping, sailing, or getting sucked under the tires?

Anti-sail brackets are essential for preventing mud flaps from being sucked under during reverse or blown outward at highway speeds. Most quality mud flap sets include these brackets, but they're often sold separately. Install them at the top corners of each flap, angled slightly outward. For additional stability, use weighted bottom bars (adds 2-4 lbs) or choose mud flaps with built-in weights. Ensure flaps hang 6-8 inches from the ground when loaded - too low increases damage risk, too high reduces effectiveness.