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Kenworth W900B/W900L Tool & Battery Boxes

Secure your gear and protect your batteries with Kenworth W900B and W900L toolboxes and battery boxes. Find full-frame mounted step boxes in in 30, 40, and 45-inch lengths.
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  • Bawer Stainless Steel Tool Box With Single Door, 1 Handle- 18 X 18 Inch

    Bawer Stainless Steel Tool Box With Single Door, 1 Handle- 18 X 18 Inch

    BAWER TOOL BOXES

    $411.99 - $561.99
    For durable truck storage, the Bawer 18 x 18 inch stainless steel tool box with a single door and one handle offers a straightforward solution. Constructed from polished 304 stainless steel, this...
    PPR_202046
    SKU:
    PPR_202046
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Height Options:
    18 Inch
    Finish Options:
    Polished
    Style Options:
    1 Door
    Width Options:
    18 Inch
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Length Options:
    18 Inch
    Length Options:
    30 Inch
    Length Options:
    24 Inch
    $411.99 - $561.99
    Qty in Cart: 0
    Price:
    $411.99 - $561.99
    Subtotal:
  • Bawer Stainless Steel Toolbox W/ 2 Handle Single Door, 18 X 18 & Length Options

    Bawer Stainless Steel Toolbox W/ 2 Handle Single Door, 18 X 18 & Length Options

    BAWER TOOL BOXES

    $674.99 - $990.99
    Add durable storage to your rig with the Bawer 18 x 18 Inch Stainless Steel Tool Box featuring a secure single door and two handles. Constructed from high-quality stainless steel, this heavy-duty...
    PPR_202047
    SKU:
    PPR_202047
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Finish Options:
    Polished
    Width Options:
    18 Inch
    Height Options:
    18 Inch
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Length Options:
    48 Inch
    Length Options:
    36 Inch
    Style Options:
    1 Door
    Length Options:
    60 Inch
    $674.99 - $990.99
    Qty in Cart: 0
    Price:
    $674.99 - $990.99
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  • FREE SHIPPING OVER $249
    BESTfit Aluminum Lower Step Panel- 45 Inch Replaces K229-1209-1 For Kenworth T800, W900B/L

    BESTfit Aluminum Lower Step Panel- 45 Inch Replaces K229-1209-1 For Kenworth T800, W900B/L

    BESTFIT TRUCK PARTS

    $146.99
    45 Inch Aluminum Lower Step Panel By BESTFit Fits Kenworth* High Quality Lower Step Panel* Made Of Aluminum * Non-Slip Thread Pattern* Fits Lower Battery/Tool Box Step* Dimensions:  - 45.0 Inch...
    02-0501300
    SKU:
    02-0501300
    Truck Class:
    Heavy Duty
    Length Options:
    45 Inch
    Material Options:
    Aluminum
    Make:
    Kenworth
    Ready To Ship:
    Yes
    Product Type:
    Frame & Chassis
    $146.99
    Qty in Cart: 0
    Price:
    $146.99
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  • Bawer Black Steel Tool Box With SS Single Door & 1 Handle- 18 X 18 X 24 Inch

    Bawer Black Steel Tool Box With SS Single Door & 1 Handle- 18 X 18 X 24 Inch

    BAWER TOOL BOXES

    $319.99
    18 X 18 X 24 Inch Black Steel Tool Box With SS Single Door & 1 Handle By BawerThis 18x18x24 inch Bawer Black Steel Underbody Tool Box with a Stainless Steel Door is a strong and durable storage...
    TU812001
    SKU:
    TU812001
    Length Options:
    24 Inch
    Color:
    Black
    Truck Class:
    Heavy Duty
    Width Options:
    18 Inch
    Material Options:
    Steel
    Make:
    Universal Items
    Height Options:
    18 Inch
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    $319.99
    Qty in Cart: 0
    Price:
    $319.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BESTfit Aluminum Lower Step Panel- 40 X 9.75 Inch Replaces K229-1209-2 For Kenworth T800, W900B, W900L

    BESTfit Aluminum Lower Step Panel- 40 X 9.75 Inch Replaces K229-1209-2 For Kenworth T800, W900B, W900L

    BESTFIT TRUCK PARTS

    $161.99
    40 X 9.75 Inch Aluminum Lower Step Panel By BESTfit Fits KenworthEquip your Kenworth T800, W900B, or W900L with the BESTfit Aluminum Lower Step Panel, engineered for a precise fit and professional...
    02-0501301
    SKU:
    02-0501301
    Position:
    Lower
    Length Options:
    40 Inch
    Truck Class:
    Heavy Duty
    Material Options:
    Aluminum
    Make:
    Kenworth
    Width Options:
    9 Inch
    Ready To Ship:
    Yes
    Product Type:
    Frame & Chassis
    $161.99
    Qty in Cart: 0
    Price:
    $161.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Merritt Zinc-Plated Steel Mounting Brackets

    Merritt Zinc-Plated Steel Mounting Brackets

    MERRITT

    $187.99 - $211.99
    The Merritt Mounting Brackets For 18 or 24 Inch Deep Tool Box are zinc-plated steel mounting brackets designed to securely attach tool boxes. Built with corrosion-resistant steel and a high-strength...
    PPR_201915
    SKU:
    PPR_201915
    Truck Class:
    Universal
    Location:
    Made In USA
    Material Options:
    Steel
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Finish Options:
    Zinc-Plated
    Length Options:
    22 Inch
    Height Options:
    29 1/2 Inch
    Height Options:
    23 Inch
    Position:
    Kit Full
    Length Options:
    16 Inch
    $187.99 - $211.99
    Qty in Cart: 0
    Price:
    $187.99 - $211.99
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  • Bawer Black Steel Tool Box W/ Stainless Steel Single Door 18 X 18 & Length Options

    Bawer Black Steel Tool Box W/ Stainless Steel Single Door 18 X 18 & Length Options

    BAWER TOOL BOXES

    $393.99 - $645.99
    Add reliable storage to your setup with the Bawer 18 x 18 inch black powder-coated steel tool box with a stainless steel single door. The toolbox features a black powder-coated steel body that helps...
    PPR_202043
    SKU:
    PPR_202043
    Truck Class:
    Heavy Duty
    Color:
    Black
    Material Options:
    Steel
    Make:
    Universal Items
    Height Options:
    18 Inch
    Style Options:
    1 Door
    Width Options:
    18 Inch
    Material Options:
    Stainless Steel
    Truck Class:
    Universal
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Finish Options:
    Black Powder Coat
    Length Options:
    60 Inch
    Length Options:
    30 Inch
    Length Options:
    36 Inch
    Length Options:
    48 Inch
    $393.99 - $645.99
    Qty in Cart: 0
    Price:
    $393.99 - $645.99
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  • FREE SHIPPING OVER $249
    Bawer Tool Box Nylon Hinge W/ Stainless Steel Pin

    Bawer Tool Box Nylon Hinge W/ Stainless Steel Pin

    BAWER TOOL BOXES

    $29.89
    Replacement Nylon Hinge W/ Stainless Steel Pin For Bawer Tool BoxIf your hinge was damaged on your Bawer tool box door, 4 State Trucks has the Bawer tool box parts you need. This replacement Bawer...
    VA9971
    SKU:
    VA9971
    Truck Class:
    Heavy Duty
    Make:
    Universal Items
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Material Options:
    Nylon
    $29.89
    Qty in Cart: 0
    Price:
    $29.89
    Subtotal:
  • Bawer Stainless Steel Tool Boxes With Single Door, 2 Handles- 18 X 24 Inch

    Bawer Stainless Steel Tool Boxes With Single Door, 2 Handles- 18 X 24 Inch

    BAWER TOOL BOXES

    $886.99 - $1,343.99
    Maximize your ride with the Bawer 18 x 24 inch stainless steel tool box with a single door and two handles. Constructed from polished 304 stainless steel, this toolbox offers strong resistance to...
    PPR_202045
    SKU:
    PPR_202045
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Style Options:
    1 Door
    Height Options:
    18 Inch
    Finish Options:
    Polished
    Width Options:
    24 Inch
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Length Options:
    36 Inch
    Length Options:
    60 Inch
    Length Options:
    48 Inch
    Height Options:
    24 Inch
    $886.99 - $1,343.99
    Qty in Cart: 0
    Price:
    $886.99 - $1,343.99
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  • Bawer 24 X 24 Inch Stainless Steel Tool Box With Double Doors, 2 Handles

    Bawer 24 X 24 Inch Stainless Steel Tool Box With Double Doors, 2 Handles

    BAWER TOOL BOXES

    $1,031.99 - $1,293.99
    Elevate your truck storage with the Bawer 24 x 24 inch stainless steel tool box with double doors and two handles which offers a solution for organizing tools and equipment. Constructed from polished...
    PPR_202059
    SKU:
    PPR_202059
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Finish Options:
    Polished
    Width Options:
    24 Inch
    Height Options:
    24 Inch
    Style Options:
    2 Door
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Length Options:
    48 Inch
    Length Options:
    60 Inch
    $1,031.99 - $1,293.99
    Qty in Cart: 0
    Price:
    $1,031.99 - $1,293.99
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  • CSM Stainless Steel Battery Box Cover- 40 Inch For Kenworth T800, W900B/L

    CSM Stainless Steel Battery Box Cover- 40 Inch For Kenworth T800, W900B/L

    CHROME SHOP MAFIA

    $346.99
    Batter Box Cover 40 Inch Stainless Steel By Chrome Shop Mafia Fits Kenworth T800, W900B/LImprove the protection of your Kenworth T800 or W900 battery with the 40-inch Chrome Shop Mafia Stainless...
    02-0501216
    SKU:
    02-0501216
    Length Options:
    40 Inch
    Truck Class:
    Heavy Duty
    Location:
    Made In USA
    Material Options:
    Stainless Steel
    Make:
    Kenworth
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    $346.99
    Qty in Cart: 0
    Price:
    $346.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Bawer Rubber Seal For Stainless Steel Tool Box

    Bawer Rubber Seal For Stainless Steel Tool Box

    BAWER TOOL BOXES

    $9.77
    Replacement Tool Box Door SealNeed to protect what you store in your tool boxes? 4 State Trucks stocks rubber door seal for the stainless steel doors on your Bawer tool boxes whether you need to...
    VA9974
    SKU:
    VA9974
    Truck Class:
    Heavy Duty
    Material Options:
    Rubber
    Make:
    Universal Items
    Product Type:
    Toolboxes
    $9.77
    Qty in Cart: 0
    Price:
    $9.77
    Subtotal:
  • FREE SHIPPING OVER $249
    Bawer Tool Box Door Gas Shock Mounting Bracket

    Bawer Tool Box Door Gas Shock Mounting Bracket

    BAWER TOOL BOXES

    $17.24
    Plastic Tool Box Door Gas Shock Mounting Bracket4 State Trucks stocks the parts you need for your Bawer tool box including plastic mounting brackets for tool box door gas shocks. These brackets are...
    TA999935
    SKU:
    TA999935
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    $17.24
    Qty in Cart: 0
    Price:
    $17.24
    Subtotal:
  • Merritt 23.5 X 28.5 Inch Aluminum Step Box With Diamond Plate Door

    Merritt 23.5 X 28.5 Inch Aluminum Step Box With Diamond Plate Door

    MERRITT

    $966.99 - $1,498.99
    Keep your equipment safe and accessible with the Merritt 23.5 x 28.5 Inch Aluminum Step Box with a diamond plate door. This rugged aluminum step saddle box is built for strength and corrosion...
    PPR_202050
    SKU:
    PPR_202050
    Location:
    Made In USA
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    Height Options:
    23 1/2 Inch
    Width Options:
    18 Inch
    Style Options:
    1 Door
    Width Options:
    36 Inch
    Length Options:
    28 Inch
    Width Options:
    24 Inch
    Finish Options:
    Diamond Plate
    Width Options:
    12 Inch
    $966.99 - $1,498.99
    Qty in Cart: 0
    Price:
    $966.99 - $1,498.99
    Subtotal:
  • Bawer Stainless Steel Step Tool Boxes With Round Hole Step- 24 X 27 Inch

    Bawer Stainless Steel Step Tool Boxes With Round Hole Step- 24 X 27 Inch

    BAWER TOOL BOXES

    $746.99 - $982.99
    For reliable truck storage that balances strength and convenience, the Bawer 24 x 27 inch stainless steel tool box with a round hole step offers a solution for organizing tools and equipment...
    PPR_202056
    SKU:
    PPR_202056
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Universal Items
    Product Type:
    Toolboxes
    Length Options:
    30 Inch
    Length Options:
    18 Inch
    Width Options:
    27 Inch
    Height Options:
    24 Inch
    Style Options:
    1 Door
    Length Options:
    24 Inch
    $746.99 - $982.99
    Qty in Cart: 0
    Price:
    $746.99 - $982.99
    Subtotal:
  • Limited Quantity Available
    Merritt 23.5 X 28.5 Inch Smooth Aluminum Step Box With Door

    Merritt 23.5 X 28.5 Inch Smooth Aluminum Step Box With Door

    MERRITT

    $1,008.99 - $1,474.99
    Maximize your truck's storage with the Merritt 23.5 x 28.5 Inch Smooth Aluminum Step Box with Door. Crafted from high-quality smooth aluminum, this premium step box features a door with T-handle and...
    PPR_201931
    SKU:
    PPR_201931
    Location:
    Made In USA
    Truck Class:
    Universal
    Material Options:
    Aluminum
    Make:
    Universal Items
    Truck Class:
    Heavy Duty
    Ready To Ship:
    Yes
    Product Type:
    Toolboxes
    Height Options:
    23 1/2 Inch
    Length Options:
    30 Inch
    Length Options:
    18 Inch
    Style Options:
    1 Door
    Length Options:
    12 Inch
    Finish Options:
    Smooth
    Length Options:
    36 Inch
    Length Options:
    24 Inch
    Width Options:
    28 Inch
    $1,008.99 - $1,474.99
    Qty in Cart: 0
    Price:
    $1,008.99 - $1,474.99
    Subtotal:
  • Stainless Steel Single Point T-Handle Latch With Mounting Holes - Includes Lock/Key Set Installed

    Stainless Steel Single Point T-Handle Latch With Mounting Holes - Includes Lock/Key Set Installed

    BUYERS PRODUCTS

    $21.88
    Flush-Mount Stainless Steel T-Handle LatchThis stainless steel T-handle latch resists corrosion and is ready to install with a lock, key, gasket, and mounting holes included. The adjustable cam fits...
    09-020100016
    SKU:
    09-020100016
    Height Options:
    4 Inch
    Truck Class:
    Universal
    Width Options:
    4 Inch
    Style Options:
    Flush Mount
    Make:
    Universal Items
    Finish Options:
    Polished
    Material Options:
    Stainless Steel
    Product Type:
    Cargo Control
    Ready To Ship:
    Yes
    $21.88
    Qty in Cart: 0
    Price:
    $21.88
    Subtotal:
  • CSM Stainless Steel Battery Box Cover For Kenworth W900B, W900L & T800 2004-Older

    CSM Stainless Steel Battery Box Cover For Kenworth W900B, W900L & T800 2004-Older

    CHROME SHOP MAFIA

    $381.99 - $416.99
    Look no further for your next exterior improvement with the Stainless Steel Battery Box Cover, designed for select Kenworth models. This 34-inch cover is made from premium 304 stainless steel,...
    PPR_201722
    SKU:
    PPR_201722
    Location:
    Made In USA
    Truck Class:
    Heavy Duty
    Material Options:
    Stainless Steel
    Make:
    Kenworth
    Product Type:
    Frame & Chassis
    Ready To Ship:
    Yes
    $381.99 - $416.99
    Qty in Cart: 0
    Price:
    $381.99 - $416.99
    Subtotal:
  • CSM Diamond Plate Aluminum Battery Box Cover- 45 Inch For Kenworth W900B, W900L 2004-Older

    CSM Diamond Plate Aluminum Battery Box Cover- 45 Inch For Kenworth W900B, W900L 2004-Older

    CHROME SHOP MAFIA

    $280.99
    45 Inch Diamond Plate Aluminum Battery Box Cover By Chrome Shop Mafia Fits KenworthGive your Kenworth W900B or W900L a durable, professional upgrade with the 45-inch CSM Diamond Plate Aluminum...
    02-0501223
    SKU:
    02-0501223
    Truck Class:
    Heavy Duty
    Make:
    Kenworth
    Material Options:
    Aluminum
    Product Type:
    Toolboxes
    Ready To Ship:
    Yes
    $280.99
    Qty in Cart: 0
    Price:
    $280.99
    Subtotal:
  • Bawer Black Poly Tool Box- 19.7 X 18.11 X 39.4 Inch

    Bawer Black Poly Tool Box- 19.7 X 18.11 X 39.4 Inch

    BAWER TOOL BOXES

    $138.99
    19.7 X 18.11 X 39.4 Inch Black Poly Tool Box By BawerIf you need a tool box that can withstand rough conditions and still look good at the end of the day, 4 State Trucks offers this quality heavy...
    E0300
    SKU:
    E0300
    Width Options:
    18 Inch
    Length Options:
    39 Inch
    Color:
    Black
    Truck Class:
    Heavy Duty
    Material Options:
    Plastic/Poly
    Make:
    Universal Items
    Product Type:
    Toolboxes
    $138.99
    Qty in Cart: 0
    Price:
    $138.99
    Subtotal:
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Adding your products to cart

Replacement Kenworth W900 Battery Box Steps

Safety is critical when climbing into your cab. If your factory steps are cracked or slippery, upgrade to a new Kenworth W900 battery box step. We offer direct-replacement lower step panels that bolt right onto your existing battery or tool box assembly. Material Options: Choose from lightweight aluminum diamond plate for maximum grip or mirror-polished stainless steel for a show-truck finish. Enhanced Traction: Our steps feature aggressive punch-out tread patterns and deep grooves to stop boots from slipping in mud, snow, or rain. Direct Fit: Designed to replace OEM steps on 40-inch and 45-inch boxes commonly found on W900L and W900B models.

Heavy-Duty Kenworth Step Boxes

Maximize your frame rail space with our selection of Kenworth step boxes. These "saddle boxes" combine the utility of a heavy-duty tool chest with the functionality of a frame step. Versatile Storage: Perfect for storing chains, binders, fluids, and batteries while keeping your deck plate clear. Sizes for Every Rig: Available in widths ranging from 12 inches to 36 inches to fit tight frame spaces. Durability: Constructed from .125-inch thick marine-grade aluminum with weather-sealed locking T-handles to keep your equipment dry and secure.

Precision Fitment & Hard-to-Find Parts

From standard W900L AeroCab setups to vocational rig configurations, we have the sizes you need. We stock standard 30-inch, 40-inch, and 45-inch assemblies complete with lids and mounting hardware. Are you searching for a specific or older configuration, such as a Kenworth 2900 battery box style or a specific 29-inch custom size? Our parts team can help you identify the correct dimensions and mounting brackets to ensure a seamless installation on your truck frame.

Frequently Asked Questions About Kenworth W900B/W900L Tool & Battery Boxes

Will these tool and battery boxes fit my Kenworth W900B or W900L without modification?

Most boxes in this category are designed to match the mounting points and frame dimensions of the W900B and W900L models, but exact fitment can vary depending on the model year and any custom frame modifications your truck may have. We recommend checking the listed specifications and measurements for each product and comparing them to your truck before purchasing. If you are unsure, our customer service team can help confirm fitment based on your truck's details.

What materials are these boxes made from, and how do they hold up over time?

Tool and battery boxes in this category are commonly available in aluminum and steel construction, often with a diamond plate or smooth finish. Aluminum boxes tend to resist corrosion better and are lighter, while steel boxes typically offer added durability for heavier-duty use. Look at each product listing for specifics on gauge thickness and finish, since these details affect long-term performance and appearance.

How do I install a tool or battery box on my truck?

Installation typically involves mounting the box to your frame rails using brackets, bolts, or existing mounting holes, depending on the box design. Some boxes are built as direct bolt-on replacements, while others may require drilling or fabrication of mounting brackets. Always refer to the manufacturer's installation instructions included with the product, and if you are not confident in DIY installation, a professional truck shop can ensure it is mounted securely.

Can these boxes handle exposure to road salt, moisture, and daily wear?

Boxes made from aluminum generally offer better resistance to rust and corrosion compared to untreated steel, making them a solid choice for trucks that run in wet or salted road conditions. Steel boxes with a powder-coated or otherwise treated finish can also hold up well, but may require more maintenance over time to prevent surface rust, especially if the coating gets scratched or chipped.

Do these boxes come with locks, and are they secure enough to protect tools and batteries?

Many tool and battery boxes include integrated locking mechanisms or are designed to accept aftermarket locks for added security. Check the individual product description to confirm whether a lock is included or sold separately. If security is a top priority, consider a box with a lockable lid or paddle latch design to help protect your tools and batteries from theft.


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