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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.
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  • FREE SHIPPING OVER $249
    Billet Aluminum Single Frame Clamps For Mounting Glow Light Brackets

    Billet Aluminum Single Frame Clamps For Mounting Glow Light Brackets

    IOWA CUSTOMS

    $54.99
    Billet Frame Clamp For Mounting Under Body Glow Light Brackets* Made Of High Quality Billet Aluminum* Billet Frame Mounting Clamp For Trucks With Single Frames* Recommended 2 Brackets Per 12 Or 24...
    09-1610087
    SKU:
    09-1610087
    Location:
    Made In USA
    Truck Class:
    Universal
    Material Options:
    Billet Aluminum
    Make:
    Universal Items
    Length Options:
    24 Inch
    Product Type:
    Lighting
    Ready To Ship:
    Yes
    $54.99
    Qty in Cart: 0
    Price:
    $54.99
    Subtotal:
  • FREE SHIPPING OVER $249
    CSM SS Under Frame Watermelon Light Bracket For Under Frame Marker Lights

    CSM SS Under Frame Watermelon Light Bracket For Under Frame Marker Lights

    CHROME SHOP MAFIA

    $106.99
    Under Frame Light Bracket By Chrome Shop Mafia* High Quality Frame Light Brackets* 304 Stainless Steel* For Mounting Watermelon Lights Under Frame* Single Holder* Hardware Not Included * Sold...
    09-16100069
    SKU:
    09-16100069
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Lighting
    Ready To Ship:
    Yes
    $106.99
    Qty in Cart: 0
    Price:
    $106.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Chrome Spiked Screw Cover Size 10/12 - 4 Pack

    Chrome Spiked Screw Cover Size 10/12 - 4 Pack

    UNITED PACIFIC

    $4.54
    Spiked Style Screw CoversCover up ugly size 10/12 screw heads in style with this pack of 4 spiked screw on covers. They are made of chrome plated plastic and fits most trucks.* High Quality Screw...
    09-1560010
    SKU:
    09-1560010
    Truck Class:
    Universal
    Style Options:
    Spike
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Finish Options:
    Chrome-Plated
    Product Type:
    Frame & Chassis
    $4.54
    Qty in Cart: 0
    Price:
    $4.54
    Subtotal:
  • Steering Box Repair Kit - Replaces TAS000001

    Steering Box Repair Kit - Replaces TAS000001

    DAYTON / DORMAN

    $35.64
    Steering Box Repair Kit With Loaded Lip Seal, Retaining Ring & 3 Dust Seals* High Quality Steering Box Repair Kit* Package Contents: Loaded Lip Seal  - Retaining Ring  - 3 Dust Seals* Seal...
    09-150000007
    SKU:
    09-150000007
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $35.64
    Qty in Cart: 0
    Price:
    $35.64
    Subtotal:
  • FREE SHIPPING OVER $249
    Rubber Gasket For Fender Step - Pair

    Rubber Gasket For Fender Step - Pair

    UNITED PACIFIC

    $8.49
    Fender Step Rubber Gaskets* High Quality Gasket* Made Of Rubber * For Fender Step* Sold As Pair* Warranty On Gasket Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...
    09-12600004
    SKU:
    09-12600004
    Truck Class:
    Universal
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Hood Parts & Acc.
    $8.49
    Qty in Cart: 0
    Price:
    $8.49
    Subtotal:
  • Black Fiberglass Jost 5Th Wheel Cover

    Black Fiberglass Jost 5Th Wheel Cover

    WTI FENDERS

    $327.99
    5th Wheel Cover* Made Of High Quality Black Fiberglass* Fits Jost Wheel Only* Great Asset When Showing Off Your Truck* Cover Up A Greasy Fifth Wheel In Seconds* Designed With Show Trucks In Mind*...
    09-11001
    SKU:
    09-11001
    Truck Class:
    Heavy Duty
    Color:
    Various
    Location:
    Made In USA
    Material Options:
    Fiberglass
    Make:
    Universal Items
    Product Type:
    Exterior
    $327.99
    Qty in Cart: 0
    Price:
    $327.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Seal Input Shaft For Rockwell RD20145 - Replaces A1205R2592 & 100494

    Seal Input Shaft For Rockwell RD20145 - Replaces A1205R2592 & 100494

    OPP - ORIGINAL PARTS PROGRAM

    $45.15
    Seal Input Shaft* High Quality Seal Tail Shaft* For Rockwell RD20145* Replaces OEM # A1205R2592, 100494* Sold Individually* Warranty On Seal Input Shaft Against Defects In Workmanship & Material From...
    09-05212010
    SKU:
    09-05212010
    Truck Class:
    Universal
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $45.15
    Qty in Cart: 0
    Price:
    $45.15
    Subtotal:
  • FREE SHIPPING OVER $249
    Seal Tail Shaft For Rockwell RD20145 - Replaces A1205P2590

    Seal Tail Shaft For Rockwell RD20145 - Replaces A1205P2590

    OPP - ORIGINAL PARTS PROGRAM

    $48.04
    Seal Tail Shaft* High Quality Seal Tail Shaft* For Rockwell RD20145* Replaces OEM # A1205P2590, 100495* Sold Individually* Warranty On Seal Tail Shaft Against Defects In Workmanship & Material From...
    09-05212009
    SKU:
    09-05212009
    Truck Class:
    Universal
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $48.04
    Qty in Cart: 0
    Price:
    $48.04
    Subtotal:
  • FREE SHIPPING OVER $249
    Seal Pinion For Rockwell RR20145 - Replaces A1205N2588

    Seal Pinion For Rockwell RR20145 - Replaces A1205N2588

    OPP - ORIGINAL PARTS PROGRAM

    $60.99
    Seal Pinion* High Quality Seal Pinion* For Rockwell RR20145* Replaces OEM # A1205N2588, 100263* Sold Individually* Warranty On Seal Pinion Against Defects In Workmanship & Material From Date Of...
    09-05212008
    SKU:
    09-05212008
    Truck Class:
    Universal
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $60.99
    Qty in Cart: 0
    Price:
    $60.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Nut For Pinion & Tail Shaft Rockwell RD-RR2014 - Replaces KIT2637

    Nut For Pinion & Tail Shaft Rockwell RD-RR2014 - Replaces KIT2637

    OPP - ORIGINAL PARTS PROGRAM

    $24.74
    Nut Pinion And Tail Shaft* High Quality Nut Pinion And Tail Shaft* For Rockwell RD-RR2014* Replaces OEM # KIT2637* Sold Individually* Warranty On Nut Pinion And Tail Shaft Against Defects In...
    09-05212007
    SKU:
    09-05212007
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $24.74
    Qty in Cart: 0
    Price:
    $24.74
    Subtotal:
  • FREE SHIPPING OVER $249
    Nut For Input Shaft Rockwell RD20145 - Replaces KIT2638

    Nut For Input Shaft Rockwell RD20145 - Replaces KIT2638

    OPP - ORIGINAL PARTS PROGRAM

    $31.18
    Nut Input Shaft* High Quality Nut Input Shaft* For Rockwell RD20145* Replaces OEM # KIT2638* Sold Individually* Warranty On Nut Input Shaft Against Defects In Workmanship & Material From Date Of...
    09-05212006
    SKU:
    09-05212006
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $31.18
    Qty in Cart: 0
    Price:
    $31.18
    Subtotal:
  • Locking Nut For Input Shaft DSP40-404

    Locking Nut For Input Shaft DSP40-404

    OPP - ORIGINAL PARTS PROGRAM

    $22.76
    Locknut Input Shaft* High Quality Nut Flanged Lock Output Shaft* Rear Input Shaft For Eaton DSP40-404* Replaces OEM # 128049* Sold Individually* Warranty On Locknut Input Shaft Against Defects In...
    09-05212005
    SKU:
    09-05212005
    Position:
    Rear
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $22.76
    Qty in Cart: 0
    Price:
    $22.76
    Subtotal:
  • FREE SHIPPING OVER $249
    Flanged Locking Nut For Pinion RSP40-404

    Flanged Locking Nut For Pinion RSP40-404

    AUTOMANN USA

    $10.20
    Nut Flanged Lock Pinion* High Quality Nut Flanged Lock Output Shaft* Rear Output Shaft For Eaton RSP40-404* Replaces OEM # 127589* Sold Individually* Warranty On Nut Flanged Lock Pinion Against...
    09-05212004
    SKU:
    09-05212004
    Position:
    Rear
    Truck Class:
    Universal
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $10.20
    Qty in Cart: 0
    Price:
    $10.20
    Subtotal:
  • Flanged Locking Nut For Rear Output Shaft Replaces 127588

    Flanged Locking Nut For Rear Output Shaft Replaces 127588

    AUTOMANN USA

    $13.38
    Nut Flanged Lock Rear Output* High Quality Nut Flanged Lock Output Shaft* Rear Output Shaft For Eaton DSP40-404* Replaces OEM # 127588* Sold Individually* Warranty On Nut Flanged Lock Output Shaft...
    09-05212003
    SKU:
    09-05212003
    Truck Class:
    Universal
    Position:
    Rear
    Material Options:
    Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $13.38
    Qty in Cart: 0
    Price:
    $13.38
    Subtotal:
  • Oil Seal Rear Output Shaft Replaces 127592

    Oil Seal Rear Output Shaft Replaces 127592

    OPP - ORIGINAL PARTS PROGRAM

    $120.99
    Rear Output Oil Seal For Eaton DSP40-404* High Quality Oil Seal Rear Output Shaft* Replaces OEM # 127592* Sold Individually* Warranty On Output Shaft Against Defects In Workmanship & Material From...
    09-05212002
    SKU:
    09-05212002
    Position:
    Rear
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $120.99
    Qty in Cart: 0
    Price:
    $120.99
    Subtotal:
  • Oil Seal Differential Input Shaft For Eaton DSP & RSP40-404 - Replaces 127591

    Oil Seal Differential Input Shaft For Eaton DSP & RSP40-404 - Replaces 127591

    OPP - ORIGINAL PARTS PROGRAM

    $47.83
    Oil Seal Differential Input Shaft* High Quality Oil Seal Differential Input Shaft* Replaces OEM # 127591* Sold Individually* Warranty On Input Shaft Against Defects In Workmanship & Material From...
    09-05212001
    SKU:
    09-05212001
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $47.83
    Qty in Cart: 0
    Price:
    $47.83
    Subtotal:
  • Cross PTO Style Universal Joint Replaces 2599582C91 For International ProStar, Volvo VNL Gen II, Peterbilt 379

    Cross PTO Style Universal Joint Replaces 2599582C91 For International ProStar, Volvo VNL Gen II, Peterbilt 379

    AUTOMANN USA

    $12.01
    Cross PTO Style Universal Joint Fits International ProStar, Volvo VNL Gen II & Peterbilt 379Enhance PTO reliability with the Cross PTO Style Universal Joint, engineered for International ProStar,...
    09-052100001
    SKU:
    09-052100001
    Length Options:
    10 Inch
    Truck Class:
    Universal
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $12.01
    Qty in Cart: 0
    Price:
    $12.01
    Subtotal:
  • Stainless Steel Steerable Lift Axle APSCO Control Panel

    Stainless Steel Steerable Lift Axle APSCO Control Panel

    AUTOMANN USA

    $899.99
    7 X 3 X 5 14 Gauge Stainless Steel APSCO Steer Axle Control Panel* High Quality Control Panel* Silver Finish* 14 Gauge Stainless Steel* Dimensions  - 7 Inch Length  - 3 Inch Width  - 5 Inch Diameter*...
    09-052000002
    SKU:
    09-052000002
    Truck Class:
    Universal
    Diameter Options:
    5 Inch
    Width Options:
    3 Inch
    Length Options:
    7 Inch
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $899.99
    Qty in Cart: 0
    Price:
    $899.99
    Subtotal:
  • Stainless Steel Lift Axle APSCO Control Panel

    Stainless Steel Lift Axle APSCO Control Panel

    AUTOMANN USA

    $662.99
    7 X 3 X 5 14 Gauge Stainless Steel APSCO Lift Axle Control Panel* High Quality Control Panel* Silver Finish* 14 Gauge Stainless Steel* Dimensions  - 7 Inch Length  - 3 Inch Width  - 5 Inch Diameter*...
    09-052000001
    SKU:
    09-052000001
    Diameter Options:
    5 Inch
    Width Options:
    3 Inch
    Length Options:
    7 Inch
    Truck Class:
    Universal
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Frame & Chassis
    $662.99
    Qty in Cart: 0
    Price:
    $662.99
    Subtotal:
  • Brake Drum Outboard 16.5 x 7 Inch Light Weight 9006X, 53-123537-002, 89996B

    Brake Drum Outboard 16.5 x 7 Inch Light Weight 9006X, 53-123537-002, 89996B

    AUTOMANN USA

    $282.99
    80000 Series Brake Drum* High quality drum* Steel Shell With Fused GrAY iRON lINER* Brake size: 16.5 x 7 inches* Bolt number: 10* Bolt circle diameter: 11.25 inches* Pilot diameter: 8.78 inches*...
    09-0517303
    SKU:
    09-0517303
    Truck Class:
    Universal
    Make:
    Universal Items
    Material Options:
    Steel
    Product Type:
    Frame & Chassis
    $282.99
    Qty in Cart: 0
    Price:
    $282.99
    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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