Kenworth W900A Mud Flaps

Frequently Asked Questions About Kenworth W900A Mud Flaps

Will these mud flaps fit my specific year Kenworth W900A, and what about other W900 models?

Our Kenworth W900A mud flaps are designed specifically for W900A models from 1961 through 1985. While some mud flaps may physically mount on W900B or W900L models, the bracket spacing and mounting holes are different between these variants. The W900A uses a unique frame rail configuration that requires specific bracket placement. We recommend checking your OEM to confirm you have a W900A model before ordering. If you have a W900B (1987-2010) or W900L (long hood), please visit those specific category pages for proper fitment.

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

Rubber mud flaps are the most popular choice for daily drivers and working trucks. They typically last 2-3 years with regular use, resist cracking in cold weather down to -40?F, and cost less to replace. Heavy-duty rubber options are 3/8" to 1/2" thick. Stainless steel mud flaps offer a classic look and can last 10+ years, but they're heavier (adding 15-20 lbs per set), create more road spray, and can bend if you back into something. Most drivers choose rubber for functionality or stainless for show trucks. Anti-sail rubber flaps with metal weights at the bottom offer the best of both worlds.

Do I need special brackets or hardware to install these, or will my existing brackets work?

Most W900A mud flaps require specific mounting brackets that attach to your frame rails. Original 1960s-1980s brackets often have rust or fatigue cracks, so we recommend replacing them during installation. Our mud flap kits include new brackets and Grade 8 mounting hardware. Installation typically takes 1-2 hours and requires basic tools: 3/4" and 15/16" wrenches, drill with 1/2" bit (for new installations), and possibly a torch for removing rusted bolts. The bracket spacing for W900A models is 24" center-to-center for most applications.

What size mud flaps do I need, and how do I measure for proper coverage?

Standard W900A mud flaps are 24" wide x 30" tall for single rear axles, while trucks with dual rear axles typically use 24" x 36" flaps. To verify, measure from your bracket mounting point to 3-4 inches above the ground when loaded - this is your ideal flap length. The flap should extend at least 2 inches beyond your outer tire edge for DOT compliance. Wide-base single tires may require 30" wide flaps. Remember that mud flaps should hang straight down and not angle back more than 15 degrees when the truck is moving.

Can I get custom logos or lettering on these mud flaps, and will it affect durability?

Yes, most of our rubber mud flaps can be customized with raised or recessed lettering. Raised lettering typically lasts the life of the flap, while vinyl decals may only last 1-2 years due to road debris and pressure washing. Stainless steel flaps can be laser-cut with custom designs or have bolt-on letter kits. Custom work typically adds 7-10 business days to delivery. Keep in mind that heavily customized areas can create weak points in rubber flaps. We recommend keeping logos in the upper third of the flap where they receive less road abuse.