Frequently Asked Questions About Kenworth W900B/W900L Frame Crossmembers & Covers

What material are these crossmembers made from, and will they rust or corrode?

Most frame crossmembers for the W900B/W900L are constructed from heavy-duty steel with either a powder-coated or chrome-plated finish. Steel crossmembers typically feature a rust-resistant coating, but they will require periodic inspection and touch-ups if the coating gets chipped. Chrome options offer excellent corrosion resistance but may show pitting in harsh salt environments. For maximum durability in severe conditions, look for crossmembers with e-coating beneath the powder coat or those made from 304 stainless steel.

Will these crossmembers fit my specific year W900B or W900L?

Frame crossmembers are generally compatible across W900B models (1987-2001) and W900L models (1989-present), but mounting hole patterns can vary based on frame rail spacing and factory options. Most critical is verifying your frame rail width - standard spacing is 34.5 inches, but some trucks have 36-inch or custom spacing. Always check the product specifications for your exact model year and measure your frame rail spacing before ordering. Some crossmembers are universal fit with slotted mounting holes to accommodate variations.

Can I install these crossmembers myself, or do I need professional help?

Installation difficulty varies by type and location. Basic bolt-on crossmember covers can typically be installed in 30-60 minutes with standard hand tools. However, structural crossmembers that support components like air tanks or battery boxes require proper torque specifications and alignment, which may necessitate professional installation. You'll need a floor jack or transmission jack to support the crossmember during installation, and having a helper makes the job much easier. Always follow manufacturer torque specs - typically 75-90 ft-lbs for frame-mounted hardware.

What's the difference between OEM-style and aftermarket crossmembers?

OEM-style crossmembers match factory specifications for hole patterns and dimensions but may use upgraded materials or finishes. Aftermarket options often feature enhanced designs with additional mounting points, integrated steps, or decorative elements like LED light cutouts. While OEM-style ensures perfect fit, quality aftermarket crossmembers can offer better corrosion resistance and visual appeal. Look for aftermarket brands that specifically state compatibility with Kenworth W900B/L frames and include grade 8 mounting hardware.

Do crossmember covers affect ground clearance or add significant weight?

Decorative crossmember covers typically add only 1/4 to 1/2 inch below the existing crossmember and weigh between 5-15 pounds depending on length and material. This minimal addition rarely affects ground clearance in practical terms. Full replacement crossmembers maintain factory ride height unless specifically designed as a drop crossmember. Stainless steel covers weigh approximately 20% more than aluminum alternatives but offer superior durability. For trucks with air-ride suspensions, the added weight is negligible and won't affect ride quality.