Kenworth W900B/W900L Rear Fenders

Frequently Asked Questions About Kenworth W900B/W900L Rear Fenders

What's the difference between W900B and W900L rear fenders, and will they fit my truck?

W900B and W900L rear fenders have different mounting configurations due to the frame rail spacing. W900B models (short hood) typically have narrower frame rails, while W900L models (long hood) have wider spacing. Before ordering, measure your frame rail width or check your OEM to confirm your exact model. Most fenders manufactured after 2007 will fit both models with proper brackets, but pre-2007 trucks may require model-specific fenders.

Are these fenders made from fiberglass or metal, and which material holds up better?

We offer both fiberglass and aluminum rear fenders. Fiberglass fenders are lighter (about 40-50% less weight), more affordable, and easier to repair if damaged. Aluminum fenders are more durable against impacts, won't crack, and maintain their shape better in extreme temperatures. For drivers in harsh winter climates or those frequently loading heavy equipment, aluminum is often the better long-term investment despite the higher upfront cost.

Can I install these fenders myself, or do I need a professional shop?

Installation typically takes 3-4 hours per side for someone with basic mechanical skills. You'll need standard hand tools, a drill with metal bits, and ideally a helper to position the fenders. The main challenges are aligning the mounting brackets correctly and drilling new holes if your bolt pattern doesn't match. We include detailed instructions, but if you're not comfortable drilling into your frame or don't have a lift, professional installation runs $200-400 and ensures proper fitment.

Do these fenders come with mounting hardware and brackets?

Most of our rear fenders include basic mounting brackets and hardware for standard installations. However, if you're replacing aftermarket fenders or have modifications like custom exhaust stacks or wider tires, you may need additional brackets or longer bolts. We recommend checking your current setup before ordering. Universal bracket kits are available separately for $45-75 if needed.

What finish options are available, and how do they hold up to road salt and weather?

Our fenders come in polished aluminum, brushed aluminum, painted steel, and gel-coated fiberglass options. Polished aluminum requires regular maintenance (monthly polishing) but provides the classic chrome-like appearance. Brushed aluminum hides scratches better and needs less maintenance. Painted options should be professionally prepped and painted for best results. All aluminum options naturally resist corrosion, while painted and fiberglass options need annual inspection and touch-ups in high-salt areas.