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Kenworth Frame & Chassis

Reinforce your Kenworth's core with 4 State Trucks' superior Kenworth semi truck frame and chassis components. Count on us for high-grade Kenworth frame and chassis parts that boost structural integrity and durability, guaranteeing your rig handles every payload with unwavering stability. From critical replacements to performance-enhancing upgrades, our parts ensure your Kenworth semi truck's foundation remains rock-solid, making each journey safer and more dependable. Choose 4 State Trucks to fortify your Kenworth's backbone, providing the sturdy base needed for optimal performance and longevity. Whether you're navigating city streets or conquering long-haul routes, our frame and chassis components give you the confidence to tackle any challenge, load after load.
  • Product
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  • FREE SHIPPING
    18 Inch Slide-In Rail Recessed Airline Box Deck Plate W/ Trailer Air And 2 Holes For 7-Way Plug Smooth Aluminum

    18 Inch Slide-In Rail Recessed Airline Box Deck Plate W/ Trailer Air And 2 Holes For 7-Way Plug Smooth Aluminum

    IOWA CUSTOMS

    $595.99
    Smooth Aluminum Slide-In Rail Deck Plate-18 Inch Recessed Airline Box W/ Trailer Air And 2 Holes For 7-Way PlugUpgrade your truck with Iowa Customs' Recessed Airline Box with Trailer Air and holes...
    09-0503115
    SKU:
    09-0503115
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Aluminum
    Style Options:
    Flush Mount
    Finish Options:
    Smooth
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $595.99
    Qty in Cart: 0
    Price:
    $595.99
    Subtotal:
  • 18 Inch Slide-In Rail Recessed Airline Box Deck Plate W/ Trailer Air & 1 Hole For 7-Way Plug Smooth Aluminum

    18 Inch Slide-In Rail Recessed Airline Box Deck Plate W/ Trailer Air & 1 Hole For 7-Way Plug Smooth Aluminum

    IOWA CUSTOMS

    $571.99
    Smooth Aluminum Slide-In Rail Deck Plate-18 Inch Recessed Airline BoxUpgrade your truck with Iowa Customs' Recessed Airline Box with Trailer Air and hole for a 7 way plug! This sleek aluminum...
    09-0503114
    SKU:
    09-0503114
    Truck Class:
    Universal
    Make:
    Universal Items
    Finish Options:
    Smooth
    Style Options:
    Flush Mount
    Material Options:
    Aluminum
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $571.99
    Qty in Cart: 0
    Price:
    $571.99
    Subtotal:
  • Recessed Air Line Box 18 Inch Aluminum W/ Holes For Trailer Air And 2 Electric 7 Way Plugs

    Recessed Air Line Box 18 Inch Aluminum W/ Holes For Trailer Air And 2 Electric 7 Way Plugs

    IOWA CUSTOMS

    $487.99
    Iowa Customs Aluminum 18 Inch Recessed Air Line Box W/ Trailer Air And 2 Electric 7 Way Plugs* High Quality Air Line Box* Made Of Aluminum* 18 Inch* Recessed * With Trailer Air * 2 Electric 7 Way...
    09-0503024
    SKU:
    09-0503024
    Truck Class:
    Universal
    Make:
    Universal Items
    Style Options:
    Flush Mount
    Material Options:
    Aluminum
    Product Type:
    Frame & Chassis
    $487.99
    Qty in Cart: 0
    Price:
    $487.99
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  • Aluminum 20 Inch Deck Plate Filler

    Aluminum 20 Inch Deck Plate Filler

    IOWA CUSTOMS

    $294.99
    Deck Plate 20 Inch Filler Section AluminumUpgrade your Iowa Customs frame deck plates with this 20-inch smooth aluminum filler section. The easy-to-install flange attachment ensures a secure fit, so...
    09-0503021
    SKU:
    09-0503021
    Truck Class:
    Universal
    Make:
    Universal Items
    Length Options:
    20 Inch
    Style Options:
    Flush Mount
    Material Options:
    Aluminum
    Product Type:
    Frame & Chassis
    $294.99
    Qty in Cart: 0
    Price:
    $294.99
    Subtotal:
  • FREE SHIPPING
    Aluminum Deck Plate 18 Inch Sectional with Air line Box With Openings For Trailer Air & 7-Way Hookups

    Aluminum Deck Plate 18 Inch Sectional with Air line Box With Openings For Trailer Air & 7-Way Hookups

    IOWA CUSTOMS

    $456.99
    Sectional Deck Plate 18 Inch Aluminum with Air line BoxThis smooth aluminum deck plate measures 18 inches with a recessed air line box for easy integration of air lines. The box is designed to...
    09-0503013
    SKU:
    09-0503013
    Truck Class:
    Universal
    Make:
    Universal Items
    Style Options:
    Flush Mount
    Material Options:
    Aluminum
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $456.99
    Qty in Cart: 0
    Price:
    $456.99
    Subtotal:
  • On Sale
    Limited Quantity Available
    12 Inch Aluminum Sectional Deck Plate Filler Panel

    12 Inch Aluminum Sectional Deck Plate Filler Panel

    IOWA CUSTOMS

    Now: $118.99
    Was: $169.99
    Sectional Deck Plate 12 Inch Aluminum Filler Panel* Made Of High Quality Aluminum* 12 Inch* Made In USA* Sold Individually* Warranty On Deck Plate Filler Panels Against Defects In Workmanship &...
    09-0503012
    SKU:
    09-0503012
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Aluminum
    Style Options:
    Surface Mount
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    Now: $118.99
    Was: $169.99
    Qty in Cart: 0
    Price:
    Now: $118.99
    Was: $169.99
    Subtotal:
  • 304 SS 18 Inch Recessed Air Line Box Sectionalized Deck Plate W/ 2 Air & 7-Way Cutout

    304 SS 18 Inch Recessed Air Line Box Sectionalized Deck Plate W/ 2 Air & 7-Way Cutout

    IOWA CUSTOMS

    $655.99
    18 Inch 304 Stainless Steel Recessed Air Line Box Sectionalized Deck Plate W/ 2 Air & 7-Way CutoutOrganize connectors on the back of your truck with this 18 inch recessed air line box by Iowa Customs...
    09-050300026
    SKU:
    09-050300026
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Stainless Steel
    Style Options:
    Flush Mount
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $655.99
    Qty in Cart: 0
    Price:
    $655.99
    Subtotal:
  • 304 Stainless Steel 24 Inch Deck Plate Filler Section

    304 Stainless Steel 24 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $466.99
    24 Inch 304 Stainless Steel Deck Plate Filler SectionDress up your truck with this stainless steel 24-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate filler...
    09-050300023
    SKU:
    09-050300023
    Truck Class:
    Universal
    Make:
    Universal Items
    Style Options:
    Surface Mount
    Material Options:
    Stainless Steel
    Product Type:
    Frame & Chassis
    $466.99
    Qty in Cart: 0
    Price:
    $466.99
    Subtotal:
  • Smooth Aluminum 22 Inch Deck Plate Filler Section

    Smooth Aluminum 22 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $294.99
    22 Inch Smooth Aluminum Deck Plate Filler SectionDress up your truck with this lightweight smooth aluminum 22-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate...
    09-050300022
    SKU:
    09-050300022
    Truck Class:
    Universal
    Make:
    Universal Items
    Finish Options:
    Smooth
    Style Options:
    Surface Mount
    Material Options:
    Aluminum
    Product Type:
    Frame & Chassis
    $294.99
    Qty in Cart: 0
    Price:
    $294.99
    Subtotal:
  • 304 Stainless Steel 22 Inch Deck Plate Filler Section

    304 Stainless Steel 22 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $453.99
    22 Inch 304 Stainless Steel Deck Plate Filler SectionDress up your truck with this stainless steel 22-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate filler...
    09-050300021
    SKU:
    09-050300021
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Stainless Steel
    Style Options:
    Surface Mount
    Product Type:
    Frame & Chassis
    $453.99
    Qty in Cart: 0
    Price:
    $453.99
    Subtotal:
  • Smooth Aluminum 24 Inch Deck Plate Filler Section

    Smooth Aluminum 24 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $310.99
    24 Inch Smooth Aluminum Deck Plate Filler SectionDress up your truck with this lightweight smooth aluminum 24-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate...
    09-050300020
    SKU:
    09-050300020
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Aluminum
    Style Options:
    Surface Mount
    Finish Options:
    Smooth
    Product Type:
    Frame & Chassis
    $310.99
    Qty in Cart: 0
    Price:
    $310.99
    Subtotal:
  • 304 Stainless Steel 20 Inch Deck Plate Filler Section

    304 Stainless Steel 20 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $436.99
    20 Inch 304 Stainless Steel Deck Plate Filler SectionDress up your truck with this stainless steel 20-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate filler...
    09-050300019
    SKU:
    09-050300019
    Truck Class:
    Universal
    Make:
    Universal Items
    Style Options:
    Surface Mount
    Material Options:
    Stainless Steel
    Product Type:
    Frame & Chassis
    $436.99
    Qty in Cart: 0
    Price:
    $436.99
    Subtotal:
  • Smooth Aluminum 18 Inch Deck Plate Filler Section

    Smooth Aluminum 18 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $265.99
    18 Inch Smooth Aluminum Deck Plate Filler SectionDress up your truck with this lightweight smooth aluminum 18-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate...
    09-050300018
    SKU:
    09-050300018
    Truck Class:
    Universal
    Make:
    Universal Items
    Finish Options:
    Smooth
    Style Options:
    Surface Mount
    Material Options:
    Aluminum
    Product Type:
    Frame & Chassis
    $265.99
    Qty in Cart: 0
    Price:
    $265.99
    Subtotal:
  • 304 Stainless Steel 18 Inch Deck Plate Filler Section

    304 Stainless Steel 18 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $405.99
    18 Inch 304 Stainless Steel Deck Plate Filler SectionDress up your truck with this lightweight smooth stainless steel 14-inch plate filler. Part of Iowa Customs patented sectional deck place system,...
    09-050300017
    SKU:
    09-050300017
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Stainless Steel
    Style Options:
    Surface Mount
    Product Type:
    Frame & Chassis
    $405.99
    Qty in Cart: 0
    Price:
    $405.99
    Subtotal:
  • Smooth Aluminum 16 Inch Deck Plate Filler Section

    Smooth Aluminum 16 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $204.99
    16 Inch Smooth Aluminum Deck Plate Filler SectionDress up your truck with this lightweight smooth aluminum 16-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate...
    09-050300016
    SKU:
    09-050300016
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Aluminum
    Finish Options:
    Smooth
    Style Options:
    Surface Mount
    Product Type:
    Frame & Chassis
    $204.99
    Qty in Cart: 0
    Price:
    $204.99
    Subtotal:
  • 304 Stainless Steel 16 Inch Deck Plate Filler Section

    304 Stainless Steel 16 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $311.99
    16 Inch 304 Stainless Steel Deck Plate Filler SectionDress up your truck with this stainless steel 16-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate filler...
    09-050300015
    SKU:
    09-050300015
    Truck Class:
    Universal
    Make:
    Universal Items
    Style Options:
    Surface Mount
    Material Options:
    Stainless Steel
    Product Type:
    Frame & Chassis
    $311.99
    Qty in Cart: 0
    Price:
    $311.99
    Subtotal:
  • Smooth Aluminum 14 Inch Deck Plate Filler Section

    Smooth Aluminum 14 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $178.99
    14 Inch Smooth Aluminum Deck Plate Filler SectionDress up your truck with this lightweight smooth aluminum 14-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate...
    09-050300014
    SKU:
    09-050300014
    Truck Class:
    Universal
    Make:
    Universal Items
    Finish Options:
    Smooth
    Style Options:
    Surface Mount
    Material Options:
    Aluminum
    Product Type:
    Frame & Chassis
    $178.99
    Qty in Cart: 0
    Price:
    $178.99
    Subtotal:
  • 304 Stainless Steel 14 Inch Deck Plate Filler Section

    304 Stainless Steel 14 Inch Deck Plate Filler Section

    IOWA CUSTOMS

    $276.99
    14 Inch 304 Stainless Steel Deck Plate Filler SectionDress up your truck with this stainless steel 14-inch plate filler. Part of Iowa Customs patented sectional deck place system, this plate filler...
    09-050300013
    SKU:
    09-050300013
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Stainless Steel
    Style Options:
    Surface Mount
    Product Type:
    Frame & Chassis
    $276.99
    Qty in Cart: 0
    Price:
    $276.99
    Subtotal:
  • Rails For Merritt 443 Deck Plate Flush Mount

    Rails For Merritt 443 Deck Plate Flush Mount

    MERRITT

    $38.46
    Merritt 443 Deck Plate Rails* High Quality Rails* For Flush Mount Merritt Deck Plate 443* Sold Individually* Warranty On Rails Against Defects In Workmanship & Material From Date Of Purchase*** High...
    09-050300010
    SKU:
    09-050300010
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $38.46
    Qty in Cart: 0
    Price:
    $38.46
    Subtotal:
  • Gabriel Shock Absorber Replaces 665763, B23548, S23548 For Hendrickson Trailer Suspension Systems

    Gabriel Shock Absorber Replaces 665763, B23548, S23548 For Hendrickson Trailer Suspension Systems

    GABRIEL

    $94.99
    Under Slung Style Replacement Shock Absorber* High Quality Shock Absorber* Sold Individually* Warranty On Shock Absorbers Against Defects In Workmanship & Material From Date Of Purchase*** High...
    09-050013
    SKU:
    09-050013
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $94.99
    Qty in Cart: 0
    Price:
    $94.99
    Subtotal:
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Adding your products to cart

Find the premium, aftermarket parts for your Kenworth Frame & Chassis. This category has everything you need for your Kenworth's frame, chassis, and suspension. Find air tanks, shocks, bushings, leaf springs, and more to maintain your truck's structural integrity and smooth ride for models like the T800, W900, and T660. Replacement Parts: Direct-fit OEM replacements for seamless installation. Performance Upgrades: Stiffer leaf springs and adjustable shocks for better handling and weight capacity. Custom Accessories: stainless trim, fender flares, and mud flaps to enhance style and protection. Whether you're doing repairs, boosting performance, or customizing your rig's look, this category has you covered.

Frequently Asked Questions About Kenworth Frame & Chassis

What years and models are compatible with your Kenworth frame and chassis parts?

Our Kenworth frame and chassis components are designed for W900, T800, T880, T680, and T660 models. Most parts fit 1985-current year models, but compatibility varies by specific component. Always check the product description for exact year ranges, or contact our team with your OEM for guaranteed fitment. We maintain detailed compatibility charts for each product to ensure proper installation.

Are these aftermarket or OEM Kenworth frame parts, and what's the quality difference?

We carry both genuine OEM Kenworth parts and high-quality aftermarket alternatives. OEM parts guarantee exact factory specifications and fitment. Our aftermarket options are manufactured to meet or exceed OEM standards, often using upgraded materials like 304 stainless steel instead of mild steel. All aftermarket suppliers are vetted for quality control and many offer lifetime warranties on their products.

What tools and experience level do I need to install frame-mounted accessories?

Most frame-mounted accessories require basic hand tools, a drill with metal bits, and safety equipment. Installation difficulty ranges from simple bolt-on parts (30-60 minutes) to more complex items requiring cutting or welding. Professional installation is recommended for structural modifications or if you lack experience with heavy truck maintenance.

What finish options are available and how do they hold up against road salt and weather?

Common finishes include chrome-plated steel, polished stainless steel, powder-coated steel, and raw steel for custom painting. Stainless steel offers the best corrosion resistance without maintenance. Chrome requires regular cleaning to prevent pitting. Powder coating provides excellent protection when properly applied. For trucks operating in salt-heavy regions, we recommend stainless steel or powder-coated options with zinc primer.

Do frame extensions or modifications affect my truck's warranty or DOT compliance?

Frame modifications can potentially void manufacturer warranties if not performed to factory specifications. Always consult your warranty documentation before making structural changes. For DOT compliance, ensure any modifications maintain proper weight distribution and don't exceed manufacturer GVWR ratings. Frame extensions must be properly reinforced and may require engineering certification in some states. We recommend consulting a certified truck mechanic or frame shop for major modifications.


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