Frequently Asked Questions About Peterbilt 375/377 Frame Crossmembers & Covers

Will these crossmembers fit my specific year Peterbilt 375 or 377?

Most aftermarket crossmembers are designed to fit Peterbilt 375 models from 1987-2007 and Peterbilt 377 models from 1987-2000. However, there can be variations based on your truck's specific configuration, wheelbase, and whether it has been modified. We recommend checking your frame rail width (typically 34" outside-to-outside) and comparing the mounting hole patterns with your existing crossmembers before ordering. If you're unsure, contact us with your VIN and we can help verify compatibility.

What's the difference between steel and aluminum crossmembers, and which should I choose?

Steel crossmembers are typically more affordable and offer excellent strength for heavy-duty applications, but they're heavier and require regular maintenance to prevent rust. Aluminum crossmembers cost more upfront but provide significant weight savings (usually 40-60% lighter), won't rust, and maintain their appearance longer. Choose steel if you prioritize initial cost and maximum strength for severe-duty use. Choose aluminum if you want weight reduction for fuel efficiency, corrosion resistance, or a polished appearance that requires minimal maintenance.

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

Installation difficulty varies by product and your mechanical experience. Basic bolt-on replacement crossmembers can typically be installed in 2-4 hours with standard tools, a jack, and jack stands. You'll need to support the frame rails properly and may need a helper to position heavier pieces. More complex installations involving welding or frame modifications should be done by a qualified technician. Most crossmembers come with basic instructions, but don't include specific torque specifications - use standard Grade 8 hardware torque values for your bolt size.

Do these crossmember covers affect ground clearance or add significant weight?

Most decorative crossmember covers add only 1/4" to 1/2" below your existing crossmember and weigh between 5-15 pounds depending on material and size. This minimal addition rarely affects ground clearance in practical applications. Full replacement crossmembers maintain factory ground clearance specifications. If you're concerned about clearance for specific terrain or loading dock situations, check the product dimensions against your current setup - most product listings include detailed measurements.

How do I match the finish of new crossmembers or covers to my existing frame components?

Common finishes include polished aluminum, brushed aluminum, chrome-plated steel, powder-coated black, and raw steel (requires painting). For the best match, identify your existing components' finish first. Polished aluminum can be maintained with regular polishing to match other bright components. Black powder-coated options work well with painted frames and can be touched up with matching paint if needed. If you're mixing materials (like adding aluminum covers to a steel frame), consider using a neutral finish like brushed aluminum or black powder coating that complements rather than trying to exactly match different materials.