Frequently Asked Questions About Peterbilt 387 Frame Crossmembers & Covers

Will these crossmembers fit my specific year Peterbilt 387?

Most frame crossmembers and covers for the Peterbilt 387 are designed to fit model years 2000-2010. However, there can be variations based on your truck's wheelbase and suspension configuration. We recommend checking your frame rail width (typically 34" or 36") and measuring the distance between mounting points before ordering. If you're unsure, contact us with your VIN and we can verify compatibility.

What's the difference between steel and aluminum crossmembers?

Steel crossmembers are typically more affordable and offer excellent strength for heavy-duty applications, but they're heavier and require periodic rust prevention maintenance. Aluminum crossmembers are lighter (reducing overall vehicle weight by 15-30 lbs per piece), naturally corrosion-resistant, and often feature a polished or brushed finish. Steel is better for severe-duty applications, while aluminum is ideal for drivers prioritizing weight savings and appearance.

Do I need special tools or professional installation?

Basic crossmember installation typically requires standard tools including a socket set, torque wrench, and jack stands. Most installations take 2-4 hours per crossmember. You'll need to support the frame properly and may need to temporarily relocate air lines or wiring. While many drivers complete this as a DIY project, installations involving suspension modifications or custom drilling should be done by a qualified technician to maintain frame integrity.

How many crossmembers does my 387 need, and where are they located?

A standard Peterbilt 387 typically has 3-5 crossmembers depending on wheelbase and configuration. Common locations include behind the cab, at the suspension pivot points, and near the rear of the frame. Day cabs usually have fewer crossmembers than sleeper models. Check your frame for existing mounting holes or brackets - adding crossmembers where none existed requires professional frame modification to avoid weakening the rails.

What finishes are available, and how do they hold up?

Common finishes include raw steel (requires painting), powder-coated black, polished aluminum, and chrome-plated steel. Powder coating typically lasts 5-7 years before showing wear, while quality chrome plating can last 10+ years with proper care. Polished aluminum requires regular cleaning to maintain its shine but won't rust. For winter driving conditions with road salt exposure, powder-coated or aluminum options provide the best long-term durability.