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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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  • Quantity
  • Price
  • Subtotal
  • FREE SHIPPING OVER $249
    14MM & 9/16 Inch Chrome Top Hat Nut Cover With Flange - 10 Pack

    14MM & 9/16 Inch Chrome Top Hat Nut Cover With Flange - 10 Pack

    AFTERMARKET

    $10.71
    Nut Cover* Made Of High Quality Chrome Plated Plastic* Top Hat Style With Flange* 9/16 Inch And 14MM Bolt Heads* Sold As Pack* Warranty On Nut Cover Against Defects In Workmanship & Material From...
    09-050602710
    SKU:
    09-050602710
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Size Options:
    14 mm
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    $10.71
    Qty in Cart: 0
    Price:
    $10.71
    Subtotal:
  • FREE SHIPPING OVER $249
    12MM & 7/16 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    12MM & 7/16 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    LIFETIME NUT COVERS

    $1.42
    Chrome Plastic Top Hat Style Nut CoverWe strive to offer the largest variety of parts to meet your needs including a huge selection of chrome-plated nut covers made in the USA by Lifetime Nut Covers...
    09-0506028
    SKU:
    09-0506028
    Location:
    Made In USA
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Material Options:
    Plastic/Poly
    Size Options:
    12 mm
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $1.42
    Qty in Cart: 0
    Price:
    $1.42
    Subtotal:
  • FREE SHIPPING OVER $249
    17MM & 11/16 Inch Chrome Plastic Top Hat Nut Cover With Flange - 10 Pack

    17MM & 11/16 Inch Chrome Plastic Top Hat Nut Cover With Flange - 10 Pack

    AFTERMARKET

    $12.89
    Nut Cover* Made Of High Quality Chrome Plated Plastic* Top Hat Style With Flange* 11/16 Inch And 17MM Bolt Heads* Sold As Pack* Made In USA* Warranty On Nut Cover Against Defects In Workmanship &...
    09-050602510
    SKU:
    09-050602510
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Size Options:
    17 mm
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $12.89
    Qty in Cart: 0
    Price:
    $12.89
    Subtotal:
  • FREE SHIPPING OVER $249
    1.125 & 1.0625 Inch Chrome Plastic Bolt Head Top Hat Nut Cover W/ Flange

    1.125 & 1.0625 Inch Chrome Plastic Bolt Head Top Hat Nut Cover W/ Flange

    LIFETIME NUT COVERS

    $3.05
    Top Hat Style Nut CoverLifetime Nut Covers is a made in the USA source for nut covers and we offer a wide variety to meet your needs including chrome-plated top hat covers with flanges. These nut...
    09-0506024
    SKU:
    09-0506024
    Truck Class:
    Universal
    Location:
    Made In USA
    Style Options:
    Top Hat
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $3.05
    Qty in Cart: 0
    Price:
    $3.05
    Subtotal:
  • FREE SHIPPING OVER $249
    18MM & 3/4 Inch Chrome Plastic Top Hat Nut Cover With Flange - 10 Pack

    18MM & 3/4 Inch Chrome Plastic Top Hat Nut Cover With Flange - 10 Pack

    AFTERMARKET

    $12.89
    Nut Cover* Made Of High Quality Chrome Plated Plastic* Top Hat Style With Flange* 3/4 Inch* 18MM Bolt Heads* Sold As Pack* Warranty On Nut Cover Against Defects In Workmanship & Material From Date Of...
    09-050602110
    SKU:
    09-050602110
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Size Options:
    18 mm
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $12.89
    Qty in Cart: 0
    Price:
    $12.89
    Subtotal:
  • Class 8 Aluminum Frame Steps 12 Inch

    Class 8 Aluminum Frame Steps 12 Inch

    BUYERS PRODUCTS

    $155.99
    Frame Steps With Grip Struts For Traction* High Quality Frame Steps* Aluminum* 12 Inch* 4.75 Inch Depth * 2 Inch Step Thickness* Mounting Hardware Sold Separately* Grip Strut Provides Superior...
    09-050500038
    SKU:
    09-050500038
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $155.99
    Qty in Cart: 0
    Price:
    $155.99
    Subtotal:
  • Class 8 Aluminum Frame Steps 24 Inch

    Class 8 Aluminum Frame Steps 24 Inch

    BUYERS PRODUCTS

    $189.99
    Frame Steps With Grip Struts For Traction* High Quality Frame Steps* Aluminum* 24 Inch* Mounting Hardware Sold Separately* Grip Strut Provides Superior Traction Even In Inclement Weather* Corrosion...
    09-050500040
    SKU:
    09-050500040
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $189.99
    Qty in Cart: 0
    Price:
    $189.99
    Subtotal:
  • Yellow Carbon Steel 3 Rung Retractable Truck Step

    Yellow Carbon Steel 3 Rung Retractable Truck Step

    BUYERS PRODUCTS

    $175.99
    Carbon Steel 3 Rung Retractable Truck Step W/ Non Slip Treads* High Quality Truck Step* Carbon Steel* Yellow* Mounting Frame - WIDth-19.63 Inch - Length-30.25 Inch - Thickness-2.68 Inch* Distance...
    09-050500041
    SKU:
    09-050500041
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $175.99
    Qty in Cart: 0
    Price:
    $175.99
    Subtotal:
  • FREE SHIPPING OVER $249
    30MM Chrome Plastic Huck Rivet Cover Bolt Heads

    30MM Chrome Plastic Huck Rivet Cover Bolt Heads

    LIFETIME NUT COVERS

    $2.23
    Top Hat Style Huck Rivet Cover With FlangeWith so many different shapes and sizes of nut covers, be sure to check out our huge selection of ABS plastic injected with triple chrome plating nut covers...
    09-0506031
    SKU:
    09-0506031
    Location:
    Made In USA
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Size Options:
    30 mm
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $2.23
    Qty in Cart: 0
    Price:
    $2.23
    Subtotal:
  • FREE SHIPPING OVER $249
    10MM & 3/8 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    10MM & 3/8 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    LIFETIME NUT COVERS

    $1.42
    Chrome Plastic Top Hat Style Nut Cover With FlangeThis top hat Lifetime Nut Cover with a flange is specially designed to fit two different sizes of nuts. Turn the nut covers one way to fit a 3/8 inch...
    09-0506029
    SKU:
    09-0506029
    Location:
    Made In USA
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Material Options:
    Plastic/Poly
    Size Options:
    10 mm
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $1.42
    Qty in Cart: 0
    Price:
    $1.42
    Subtotal:
  • FREE SHIPPING OVER $249
    14MM & 9/16 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    14MM & 9/16 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    LIFETIME NUT COVERS

    $1.42
    Top Hat Style Nut CoverNot only is having the nut covers to add some shine to your truck something to look for, but also the fitment of the nut covers. We proudly offer Lifetime Nut Covers made in...
    09-0506027
    SKU:
    09-0506027
    Location:
    Made In USA
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Material Options:
    Plastic/Poly
    Size Options:
    14 mm
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $1.42
    Qty in Cart: 0
    Price:
    $1.42
    Subtotal:
  • FREE SHIPPING OVER $249
    17MM & 11/16 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    17MM & 11/16 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    LIFETIME NUT COVERS

    $2.03
    Top Hat Style Nut Cover With FlangeThis top hat Lifetime Nut Cover with a flange is specially designed to fit two different sizes of nuts. Turn the nut covers one way to fit a 11/16 inch bolt head or...
    09-0506025
    SKU:
    09-0506025
    Location:
    Made In USA
    Truck Class:
    Universal
    Style Options:
    Top Hat
    Material Options:
    Plastic/Poly
    Size Options:
    17 mm
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $2.03
    Qty in Cart: 0
    Price:
    $2.03
    Subtotal:
  • FREE SHIPPING OVER $249
    18MM & 3/4 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    18MM & 3/4 Inch Chrome Plastic Bolt Heads Top Hat Nut Cover W/ Flange

    LIFETIME NUT COVERS

    $2.03
    Top Hat Style Nut CoverThis top hat Lifetime Nut Cover with a flange is specially designed to fit two different sizes of nuts. Turn the nut covers one way to fit a standard sized inch bolt head or...
    09-0506021
    SKU:
    09-0506021
    Location:
    Made In USA
    Truck Class:
    Universal
    Length Options:
    1 Inch
    Style Options:
    Top Hat
    Material Options:
    Plastic/Poly
    Size Options:
    18 mm
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $2.03
    Qty in Cart: 0
    Price:
    $2.03
    Subtotal:
  • Class 8 Aluminum Frame Steps 18 Inch

    Class 8 Aluminum Frame Steps 18 Inch

    BUYERS PRODUCTS

    $175.99
    Frame Steps With Grip Struts For Traction* High Quality Frame Steps* Aluminum* 18 Inch* Mounting Hardware Sold Separately* Grip Strut Provides Superior Traction Even In Inclement Weather* Corrosion...
    09-050500039
    SKU:
    09-050500039
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $175.99
    Qty in Cart: 0
    Price:
    $175.99
    Subtotal:
  • 20 x 18 x 36 Inch Aluminum Underbody Truck Box W/ Drawer

    20 x 18 x 36 Inch Aluminum Underbody Truck Box W/ Drawer

    BUYERS PRODUCTS

    $1,077.99
    Diamond Tread Underbody Truck Box W/ DrawerThe 36-inch Diamond Tread Aluminum Underbody Truck Box with Drawer is built to last, featuring durable corrosion-resistant aluminum. It includes adjustable...
    09-020100546
    SKU:
    09-020100546
    Truck Class:
    Universal
    Length Options:
    36 Inch
    Width Options:
    18 Inch
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Cargo Control
    $1,077.99
    Qty in Cart: 0
    Price:
    $1,077.99
    Subtotal:
  • Stainless Steel Front Upper Step Kick Plates For Kenworth T660 2008-2017

    Stainless Steel Front Upper Step Kick Plates For Kenworth T660 2008-2017

    UNITED PACIFIC

    $195.99
    Kenworth T660 SS Front Upper Step Kick Plates* High Quality Kick Plate* 430 Stainless Steel* Front Upper Step * Attaches Using Supplied Hardware To The Upper Step* Sold As Pair* Warranty On Kick...
    02-05050005
    SKU:
    02-05050005
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    $195.99
    Qty in Cart: 0
    Price:
    $195.99
    Subtotal:
  • Stainless Steel Front Upper Step Kick Plates For Kenworth T700 20011-2014

    Stainless Steel Front Upper Step Kick Plates For Kenworth T700 20011-2014

    UNITED PACIFIC

    $167.99
    SS Front Upper Step Kick Plates* High Quality Kick Plate* 430 Stainless Steel* Front Upper Step * Hardware Included* Sold As Pair* Warranty On Kick Plates Against Defects In Workmanship & Material...
    02-05050004
    SKU:
    02-05050004
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    $167.99
    Qty in Cart: 0
    Price:
    $167.99
    Subtotal:
  • Stainless Steel Front Upper Step Kick Plates For Kenworth T660

    Stainless Steel Front Upper Step Kick Plates For Kenworth T660

    UNITED PACIFIC

    $174.99
    Kenworth T660 Front Upper Step Kick Plates* High Quality Kick Plate* 430 Stainless Steel* Front Upper Step * Attaches Using Supplied Hardware To The Upper Step* Sold As Pair* Warranty On Kick Plates...
    02-05050006
    SKU:
    02-05050006
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    $174.99
    Qty in Cart: 0
    Price:
    $174.99
    Subtotal:
  • Stainless Steel Front Lower Step Kick Plates For Kenworth T700 2011-2014

    Stainless Steel Front Lower Step Kick Plates For Kenworth T700 2011-2014

    UNITED PACIFIC

    $140.99
    SS Front Lower Step Kick Plates* High Quality Kick Plate* 430 Stainless Steel* Front Lower Step * Hardware Included* Sold As Pair* Warranty On Kick Plates Against Defects In Workmanship & Material...
    02-05050003
    SKU:
    02-05050003
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    $140.99
    Qty in Cart: 0
    Price:
    $140.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Stainless Steel Catch Plate

    Stainless Steel Catch Plate

    AFTERMARKET

    $8.06
    SS Catch Plate4 State Trucks offers replacement stainless steel catch plates for rubber strap tension securement. These plates are made by Austin Hardware and Supply and we offer free shipping on...
    WJ90SS
    SKU:
    WJ90SS
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    $8.06
    Qty in Cart: 0
    Price:
    $8.06
    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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