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Peterbilt 389 Glider Frame Crossmembers & Covers
Frequently Asked Questions About Peterbilt 389 Glider Frame Crossmembers & Covers
What years and models are these crossmembers compatible with?
These frame crossmembers and covers are specifically designed for Peterbilt 389 glider kits from 2007 to present. While they share similar mounting points with some 388 models, we recommend verifying your frame rail spacing and mounting hole patterns before ordering. Most crossmembers fit standard 34.5" frame rail spacing, but extended hood models may require different specifications. Contact our support team with your VIN for exact fitment confirmation.
Are these crossmembers made from aluminum or steel, and which is better for my application?
We offer both aluminum and steel options. Steel crossmembers typically range from 3/16" to 1/4" thickness and provide maximum strength for heavy-duty applications, though they add more weight. Aluminum crossmembers are usually 1/4" to 3/8" thick, offering excellent corrosion resistance and weight savings of 40-60% compared to steel. For show trucks or lighter applications, aluminum is preferred. For heavy haul or vocational use, steel provides superior durability.
What tools and hardware are required for installation?
Installation typically requires a 1/2" drive socket set, torque wrench capable of 150 ft-lbs, drill with metal bits (if new holes are needed), and basic hand tools. Most crossmembers come with Grade 8 mounting bolts, but verify this before purchase. Installation usually takes 2-4 hours per crossmember. Some applications may require minor drilling or modifications to existing mounting holes. Professional installation is recommended if you're unfamiliar with frame work.
What finish options are available and how do they hold up?
Common finishes include mirror polish, brushed aluminum, powder coating (black or custom colors), and chrome plating. Mirror polish requires regular maintenance but provides the best show appearance. Powder coating offers excellent durability and chip resistance for working trucks. Chrome plating provides good corrosion protection but can be expensive. Raw steel options are available for those planning custom finishing. Most aluminum pieces come with a protective film that should be removed after installation.
How many crossmembers do I need for a complete glider kit setup?
A typical Peterbilt 389 glider requires 4-6 crossmembers depending on your configuration. Standard setups include: front engine crossmember, transmission crossmember, center frame crossmember, and rear suspension crossmember. Additional crossmembers may be needed for auxiliary equipment like APUs, toolboxes, or specialized mounting brackets. We recommend purchasing crossmembers as a complete set to ensure consistent appearance and proper frame support distribution.