Frequently Asked Questions About International 9900/i/ix Mud Flaps

Will these mud flaps fit my specific International 9900 model year?

Our International 9900/i/ix mud flaps are designed to fit all 9900, 9900i, and 9900ix models from 1995 through current production years. The mounting holes and brackets are engineered to match the factory specifications across these model variations. However, if your truck has aftermarket modifications to the rear fenders or custom exhaust configurations, you may need to adjust the mounting position or use universal brackets for proper fitment.

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

Rubber mud flaps are the most economical option, offering good protection and flexibility in cold weather. They typically last 2-3 years with regular highway use. Stainless steel backed mud flaps feature a polished or brushed metal plate bonded to heavy-duty rubber, providing superior durability and a premium appearance. While they cost more initially, they often last 5-7 years and maintain their appearance better, making them popular with owner-operators who want their rigs looking sharp.

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

Most International 9900 series trucks have pre-existing mounting holes that align with our mud flap brackets, so drilling is rarely required. You'll need basic hand tools: a socket set (typically 9/16" and 5/8"), wrenches, and possibly a drill if you're adding anti-sail brackets. Installation usually takes 30-45 minutes per side. The most common challenge is accessing the upper mounting bolts, which may require removing the inner fender liner for easier access.

How do I prevent mud flaps from sailing or flipping up while driving?

Wind sail is a common concern, especially for drivers running heavy or oversized flaps. We recommend using anti-sail brackets or weights for flaps 30 inches or wider. Stainless steel weighted mud flaps naturally resist sailing better than standard rubber. For extreme conditions, consider drill-free anti-sail mounting systems that attach to your frame rails, keeping flaps stable even at highway speeds without adding stress to the flap material.

What size mud flaps do I need for DOT compliance?

Federal DOT regulations require mud flaps to be wide enough to cover the full width of your tires and extend to within 8 inches of the ground when the vehicle is loaded. For most International 9900 series trucks with standard dual wheels, 24" wide x 30" long mud flaps meet these requirements. If you're running super singles or wide-base tires, you'll need 30" wide flaps. Always check your state's specific requirements, as some states like Texas and California have stricter regulations requiring flaps to extend within 6 inches of the ground.