Kenworth W900B/W900L Mud Flaps

Frequently Asked Questions About Kenworth W900B/W900L Mud Flaps

What's the difference between mud flaps for W900B and W900L models?

The main difference is the mounting bracket design and spacing. W900B models (produced until 1987) have a shorter wheelbase and different frame rail configuration, requiring mud flaps with closer-spaced mounting holes. W900L models feature an extended hood and longer wheelbase, needing mud flaps with wider bracket spacing. Always verify your specific truck's year and configuration before ordering, as some transitional years may have variations.

Will these mud flaps fit my lifted or lowered W900?

Standard mud flaps are designed for factory ride height. If your truck is lifted more than 2 inches, you'll need longer mud flaps or adjustable mounting brackets to maintain proper ground clearance (typically 6-8 inches). For lowered trucks, you may need to trim the flaps or choose shorter options. Many drivers with modified suspensions opt for adjustable anti-sail brackets that allow height customization during installation.

How difficult is the installation, and what tools do I need?

Installation typically takes 1-2 hours per side for someone with basic mechanical skills. You'll need a drill with metal bits (usually 3/8" and 1/2"), wrenches or socket set, measuring tape, and a marker. Most mud flaps come with templates for drilling mounting holes. The trickiest part is often accessing the upper mounting points behind the fuel tanks. Having a helper to hold the flaps in position while marking holes makes the job much easier.

What material holds up best against road chemicals and weather?

Heavy-duty rubber (3/8" to 1/2" thick) provides the best longevity and flexibility in extreme temperatures. Look for mud flaps with anti-sail bars or weighted bottoms to prevent wind flutter at highway speeds, which causes premature wear. Avoid thin plastic options if you run in areas with heavy salt use or extreme cold, as they tend to crack. Many professional drivers prefer black rubber with stainless steel weights for the best combination of durability and appearance.

Do I need to buy brackets separately, or do they come with the mud flaps?

This varies by manufacturer and product listing. Basic mud flaps often come as just the flap material, requiring you to purchase mounting brackets separately. Complete kits include flaps, brackets, and hardware but cost more upfront. If you're replacing worn flaps but your existing brackets are in good condition, you can save money buying flaps only. Check the product description carefully - look for terms like "complete kit" or "flaps only" to avoid ordering issues.