- Home
- Freightliner Parts
- Freightliner SD 108-122 Parts
- Freightliner SD 108-122 Frame & Chassis
- Freightliner SD 108-122 Deck Plates-Air Line Boxes
Freightliner SD 108-122 Deck Plates-Air Line Boxes
Frequently Asked Questions About Freightliner SD 108-122 Deck Plates & Air Line Boxes
What specific Freightliner models and years are compatible with these SD 108-122 deck plates?
These deck plates are designed specifically for Freightliner models SD 108, SD 112, SD 114, and SD 122. They fit model years 2002 through current production years. The mounting holes and dimensions are engineered to match the factory specifications for these severe duty (SD) truck models. Always verify your truck's exact model designation before ordering, as Century Class and Columbia models use different deck plate configurations.
Are these deck plates made from aluminum or steel, and how thick is the material?
Most SD 108-122 deck plates are manufactured from heavy-duty aluminum diamond plate, typically 1/8 inch (3mm) thick. Some heavy-duty options feature 3/16 inch thickness for extreme applications. The aluminum construction provides excellent corrosion resistance while keeping weight down. Steel options are available for specific applications but are less common due to weight and rust concerns. All mounting brackets are typically powder-coated steel for maximum durability.
Do I need to drill new holes for installation, or do these use existing mounting points?
These deck plates are designed to use your truck's existing factory mounting points - no drilling required in most cases. The air line boxes mount using the OEM bolt holes behind the cab. Installation typically takes 1-2 hours with basic hand tools. You'll need a socket set, screwdrivers, and possibly a rivet gun if your original mounting hardware needs replacement. Some installers recommend applying silicone sealant around mounting points to prevent water intrusion.
Will these deck plates work with my aftermarket exhaust stacks and air cleaners?
Yes, these deck plates feature pre-cut openings that accommodate most standard 5-inch and 6-inch exhaust stacks, as well as common air cleaner configurations. The cutouts are oversized slightly to allow for exhaust movement and thermal expansion. If you have non-standard or oversized stacks (7-inch or larger), you may need to modify the openings. Many drivers with custom setups use a plasma cutter or hole saw to enlarge the openings as needed.
What's included with the deck plate kit, and what additional hardware might I need?
Complete deck plate kits typically include the driver and passenger side plates, integrated air line boxes with doors, rubber door seals, and basic mounting hardware. However, you may need to purchase additional stainless steel bolts, washers, and rubber grommets depending on your truck's condition. Many customers also add LED marker lights (not included) to the air line boxes for enhanced visibility. Budget an extra $20-40 for supplementary hardware and weatherstripping if your truck is older or has corroded original mounting points.