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Western Star Trucks

Looking for Western Star truck parts? At 4 State Trucks, you'll find everything from durable replacements to custom accessories for your rig. Explore and find the perfect parts for your Western Star truck today!
  • Product
  • Qty in Cart
  • Quantity
  • Price
  • Subtotal
  • Fender Washer Replaces 2701156

    Fender Washer Replaces 2701156

    AUTOMANN USA

    $2.26
    0.5 Inch ID X 1.75 Inch OD Fender WasherThis high-quality Fender Washer is built for heavy-duty performance, replacing 2701156. Flat hard end design, 1/2-inch inner diameter, 1-3/4-inch outer...
    29-1240007
    SKU:
    29-1240007
    Product Type:
    Hood Parts & Acc.
    Diameter Options:
    1 1/2 Inch
    Make:
    Universal Items
    $2.26
    Qty in Cart: 0
    Price:
    $2.26
    Subtotal:
  • 20 Inch 6 Spoke Wheel Replaces FA705K, FX196KX, FX705KX, 9660

    20 Inch 6 Spoke Wheel Replaces FA705K, FX196KX, FX705KX, 9660

    AFTERMARKET

    $780.99
    20 Inch Spoke Wheel W/ 6 Spokes, 12.750 Inch Mounting Bolt Hole Circle Diameter & 6- 0.75 Inch Bolt HolesGet dependable performance with this 20 Inch 6 Spoke Wheel. Featuring wheel bearing cups, rim...
    29-20100000
    SKU:
    29-20100000
    Product Type:
    Wheels
    Diameter Options:
    20 Inch
    Make:
    Universal Items
    $780.99
    Qty in Cart: 0
    Price:
    $780.99
    Subtotal:
  • Dosing Pump Urea Injection Replaces 2871879, 0444042132, 4387657 For Cummins & PACCAR Engines

    Dosing Pump Urea Injection Replaces 2871879, 0444042132, 4387657 For Cummins & PACCAR Engines

    AFTERMARKET

    $776.99
    5.5 X 8.09 Inch Dosing Pump Urea Injection- 10 PinEnsure precise DEF delivery with this high-quality Dosing Pump Urea Injection for Cummins and PACCAR engines. The 2.2 Type Supply Module features a...
    29-08060023
    SKU:
    29-08060023
    Product Type:
    Exhaust
    Height Options:
    5 Inch
    Make:
    Universal Items
    $776.99
    Qty in Cart: 0
    Price:
    $776.99
    Subtotal:
  • Ignition Switch Replaces P271048 For PACCAR Engines

    Ignition Switch Replaces P271048 For PACCAR Engines

    AFTERMARKET

    $52.99
    2.5 Inch Ignition Switch- 7 PinReplace your worn or faulty ignition with this precision PACCAR Ignition Switch. Complete with a lock cylinder, two keys, and a 7-pin connector, it measures 2.5 inches...
    29-15000004
    SKU:
    29-15000004
    Product Type:
    Interior
    Style Options:
    Paccar
    Make:
    Universal Items
    $52.99
    Qty in Cart: 0
    Price:
    $52.99
    Subtotal:
  • Actuator Dock Lock Replaces 1S4187, S29899, SSR1VA1031 For Hendrickson/ Turner Trailers

    Actuator Dock Lock Replaces 1S4187, S29899, SSR1VA1031 For Hendrickson/ Turner Trailers

    AUTOMANN USA

    $33.38
    Sleeve Type Actuator Dock Lock Fits Hendrickson/ Turner TrailersThis premium Actuator Dock Lock is designed for Hendrickson and Turner Trailers. Sleeve-type design with top and bottom plates...
    29-09500003
    SKU:
    29-09500003
    Height Options:
    10 1/2 Inch
    Product Type:
    Trailer
    Make:
    Universal Items
    Make:
    Trailer
    $33.38
    Qty in Cart: 0
    Price:
    $33.38
    Subtotal:
  • Oil Plug Replaces 9S-8008, 9S8008 For Caterpillar C7 Engines

    Oil Plug Replaces 9S-8008, 9S8008 For Caterpillar C7 Engines

    AUTOMANN USA

    $15.25
    1.253 X 0.771 Inch Oil Plug W/ 0.575 Inch A/F & 1-1/16 Inch - 12 ThreadEnsure your Caterpillar C7 engine remains protected with this precision Oil Plug. Featuring 0.575-inch A/F, 1.253-inch diameter,...
    29-07200011
    SKU:
    29-07200011
    Product Type:
    Engine Parts
    Style Options:
    Caterpillar
    Make:
    Universal Items
    $15.25
    Qty in Cart: 0
    Price:
    $15.25
    Subtotal:
  • Lock Washer Replaces SA16004, C70641B, 93600072, 355AX, T1705

    Lock Washer Replaces SA16004, C70641B, 93600072, 355AX, T1705

    AUTOMANN USA

    $0.34
    0.5 Inch Lock WasherMaintain optimal fastening with this durable Lock Washer, designed for SA16004, C70641B, 93600072, 355AX, and T1705. Medium-duty washer with 1/2-inch ID, 11/64-inch width, and...
    29-1240004
    SKU:
    29-1240004
    Product Type:
    Hood Parts & Acc.
    Diameter Options:
    1/2 Inch
    Make:
    Universal Items
    $0.34
    Qty in Cart: 0
    Price:
    $0.34
    Subtotal:
  • Cabin Air Spring Replaces 75314, SC29-O132, 7155, 7164, W023587155, W027037163, W027037164, W027037165, 1S4235, R816002, W027037153, 2019036

    Cabin Air Spring Replaces 75314, SC29-O132, 7155, 7164, W023587155, W027037163, W027037164, W027037165, 1S4235, R816002, W027037153, 2019036

    AFTERMARKET

    $57.99
    Sleeve Type Cabin Air Spring- Load At 80 PSI - 688 Lbs, Load At 100 PSI - 860 LbsImprove ride comfort and cab stability with this high-quality Cabin Air Spring. This sleeve-type air spring supports...
    29-10140001
    SKU:
    29-10140001
    Diameter Options:
    4 1/4 Inch
    Product Type:
    Exterior
    Height Options:
    8 1/2 Inch
    Make:
    Universal Items
    $57.99
    Qty in Cart: 0
    Price:
    $57.99
    Subtotal:
  • DPF Gasket Replaces 5304868, 5417859, 2188190PE For Cummins, PACCAR

    DPF Gasket Replaces 5304868, 5417859, 2188190PE For Cummins, PACCAR

    AFTERMARKET

    $36.34
    14.25 Inch ID X 15.375 Inch OD DPF GasketKeep your DPF system functioning efficiently with this high-quality gasket for Cummins and PACCAR engines. With a 14.250-inch ID, 15.375-inch OD, and 0...
    29-0809209
    SKU:
    29-0809209
    Product Type:
    Exhaust
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $36.34
    Qty in Cart: 0
    Price:
    $36.34
    Subtotal:
  • Oil Pump Replaces 3966840 For Cummins ISC 8.3L Engines

    Oil Pump Replaces 3966840 For Cummins ISC 8.3L Engines

    AFTERMARKET

    $140.99
    Cummins ISC 8.3L Engine Oil PumpThis premium Oil Pump for Cummins ISC 8.3L engines replaces part number 3966840 and is built for heavy-duty performance. Designed to maintain steady lubrication and...
    29-07200013
    SKU:
    29-07200013
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Make:
    Universal Items
    $140.99
    Qty in Cart: 0
    Price:
    $140.99
    Subtotal:
  • V-Band Clamp Kit Replaces 2871862

    V-Band Clamp Kit Replaces 2871862

    AUTOMANN USA

    $93.99
    Stainless Steel V-Band Clamp Kit W/ 13.375 Inch Nominal Diameter V- ClampThis high-performance V-Band Clamp Kit is engineered for Kenworth, Peterbilt, Freightliner, International, and Western Star...
    29-0809210
    SKU:
    29-0809210
    Material Options:
    Stainless Steel
    Product Type:
    Exhaust
    Make:
    Peterbilt
    Make:
    International
    Make:
    Kenworth
    Make:
    Freightliner
    Make:
    Western Star
    $93.99
    Qty in Cart: 0
    Price:
    $93.99
    Subtotal:
  • Oil Cooler Replaces 3957544, 3921558, 4713985AB, AP63467 For Cummins ISB 5.9L Engine

    Oil Cooler Replaces 3957544, 3921558, 4713985AB, AP63467 For Cummins ISB 5.9L Engine

    AFTERMARKET

    $164.99
    Oil Cooler W/ 7 PlatesThis high-performance Oil Cooler is the perfect replacement for Cummins ISB 5.9L engines. With 7 plated construction and fifteen precision-drilled holes-twelve at 0.340-inch and...
    29-07200005
    SKU:
    29-07200005
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Make:
    Universal Items
    $164.99
    Qty in Cart: 0
    Price:
    $164.99
    Subtotal:
  • 3.5 Inch Aluminized Steel Band Clamp Replaces A35AF, J000201

    3.5 Inch Aluminized Steel Band Clamp Replaces A35AF, J000201

    AUTOMANN USA

    $11.01
    3.5 Inch Aluminized Band ClampSecure your exhaust or piping system with this high-quality 3.5 Inch Aluminized Steel Band Clamp. Featuring pre-attached hardware and a Grade 8 M10 3/8-inch bolt, it...
    29-08000005
    SKU:
    29-08000005
    Diameter Options:
    3 1/2 Inch
    Product Type:
    Exhaust
    Width Options:
    1 1/4 Inch
    Material Options:
    Aluminized Steel
    Make:
    Universal Items
    $11.01
    Qty in Cart: 0
    Price:
    $11.01
    Subtotal:
  • EGR Pressure Differential Sensor Replaces 23531964 For Detroit Diesel 60 Series Engines

    EGR Pressure Differential Sensor Replaces 23531964 For Detroit Diesel 60 Series Engines

    AFTERMARKET

    $177.99
    EGR Pressure Differential Sensor- 3 PinMonitor exhaust gas pressure with confidence using this premium EGR Pressure Differential Sensor, replacement for Detroit Diesel 60 Series engines. Featuring 3...
    29-07100030
    SKU:
    29-07100030
    Product Type:
    Engine Parts
    Style Options:
    Detroit
    Make:
    Universal Items
    $177.99
    Qty in Cart: 0
    Price:
    $177.99
    Subtotal:
  • Oil Plug Replaces 9S-8004, 9S8004, 0995845 For Caterpillar C7 Engines

    Oil Plug Replaces 9S-8004, 9S8004, 0995845 For Caterpillar C7 Engines

    AUTOMANN USA

    $14.52
    0.684 X 0.500 Inch Oil Plug W/ 0.265 Inch A/F & 9/16 Inch - 18 ThreadMaintain your Caterpillar C7 engine with this premium Oil Plug. Its 0.265-inch A/F, 0.684-inch diameter, 0.500-inch length, and...
    29-07200010
    SKU:
    29-07200010
    Product Type:
    Engine Parts
    Style Options:
    Caterpillar
    Make:
    Universal Items
    $14.52
    Qty in Cart: 0
    Price:
    $14.52
    Subtotal:
  • Power Steering Reservoir Cover Replaces 3953866S, Q760236, Q760241, Q761939, NMCQ760236, 5839Q761939, Q761939FLG, FGQ761939

    Power Steering Reservoir Cover Replaces 3953866S, Q760236, Q760241, Q761939, NMCQ760236, 5839Q761939, Q761939FLG, FGQ761939

    AUTOMANN USA

    $24.17
    4.25 X 6.37 Inch Power Steering Reservoir CoverThis Power Steering Reservoir Cover is an essential replacement for maintaining smooth steering operation in your truck. It features exacting...
    29-07120013
    SKU:
    29-07120013
    Height Options:
    4 Inch
    Diameter Options:
    6 1/4 Inch
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $24.17
    Qty in Cart: 0
    Price:
    $24.17
    Subtotal:
  • Oil Plug Replaces 168-2288, 1682288 For Caterpillar C7 Engines

    Oil Plug Replaces 168-2288, 1682288 For Caterpillar C7 Engines

    AUTOMANN USA

    $15.24
    0.953 Inch Oil Plug W/ 1.122 Inch A/F & M18 x 1.5 ThreadReplace worn or damaged plugs with this premium Oil Plug for Caterpillar C7 engines. With a 1.122-inch A/F, 0.953-inch length, and M18 x 1.5...
    29-07200009
    SKU:
    29-07200009
    Product Type:
    Engine Parts
    Style Options:
    Caterpillar
    Make:
    Universal Items
    $15.24
    Qty in Cart: 0
    Price:
    $15.24
    Subtotal:
  • EGR Pressure Differential Sensor Replaces P4050-5207-1, P405052071, ME555560 For Mitsubishi, Detroit Diesel

    EGR Pressure Differential Sensor Replaces P4050-5207-1, P405052071, ME555560 For Mitsubishi, Detroit Diesel

    AFTERMARKET

    $91.99
    2.78 Inch EGR Pressure Differential Sensor- 3 PinReliable performance and accurate EGR readings are ensured with this high-quality EGR Pressure Differential Sensor, replacement for Mitsubishi and...
    29-07100032
    SKU:
    29-07100032
    Style Options:
    Detroit
    Product Type:
    Engine Parts
    Length Options:
    2 3/4 Inch
    Make:
    Universal Items
    $91.99
    Qty in Cart: 0
    Price:
    $91.99
    Subtotal:
  • Power Steering Reservoir Cover Clamp Replaces NMCQ186425, Q186425

    Power Steering Reservoir Cover Clamp Replaces NMCQ186425, Q186425

    AUTOMANN USA

    $15.26
    5.75 Inch To 7.0 Inch ID Power Steering Reservoir Cover ClampReplace worn or damaged clamps with this durable Power Steering Reservoir Cover Clamp. Its adjustable 5.75 to 7.0-inch inner diameter and...
    29-07120015
    SKU:
    29-07120015
    Width Options:
    1/2 Inch
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $15.26
    Qty in Cart: 0
    Price:
    $15.26
    Subtotal:
  • Belt Tensioner Assembly Replaces 1971873PE, 2143061PE, 2140648PE For PACCAR MX Engines

    Belt Tensioner Assembly Replaces 1971873PE, 2143061PE, 2140648PE For PACCAR MX Engines

    AUTOMANN USA

    $277.99
    2.952 X 1.84 Inch Belt Tensioner AssemblyOptimize your PACCAR MX engine performance with this high-quality Belt Tensioner Assembly. Featuring a pulley 1.840 inches wide and 2.952 inches in outer...
    29-07060177
    SKU:
    29-07060177
    Diameter Options:
    3 Inch
    Width Options:
    1 3/4 Inch
    Style Options:
    Paccar
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $277.99
    Qty in Cart: 0
    Price:
    $277.99
    Subtotal:
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Adding your products to cart

Western Star Semi Truck Parts and Accessories

Western Star trucks are known for strength, style, and staying power—and your parts should match that same level of toughness. At 4 State Trucks, we stock premium Western Star semi truck parts and accessories to help keep your rig running right. Whether you're working a Western Star 4900 on the job site or hauling across the country in a Western Star 5700, we’ve got the commercial truck parts you need to stay rolling.

High-Quality Parts for Every Western Star Truck Model

No matter what kind of job your Western Star handles, we’ve got the semi truck parts to keep it in top shape. Our inventory includes replacement and aftermarket parts for both heavy-duty vocational models like the 4900 and long-haul tractors like the 5700. From bumpers and grilles to cab accessories, lights, and engine components—we carry a full selection of truck parts and accessories to restore or upgrade your ride. Built to meet the demands of serious drivers, this lineup keeps your truck working as hard as you do.

Best Features of Western Star Parts & Accessories

When it comes to buying truck parts online, you want parts that are built to last. That’s why our Western Star parts are known for: Fuel-efficient engine compatibility to reduce long-term costs. Rugged design for commercial use, off-road durability, and long-haul wear. Precise fitment across multiple configurations, including day cab and sleeper setups. Parts made for easy installs—saving you time and hassle. Wide inventory of online truck parts for maintenance, upgrades, and customization. Whether you’re replacing worn components or customizing your cab, you’ll find parts that deliver both function and style.

Shop Commercial Truck Parts Online with 4 State Trucks

At 4 State Trucks, we make it easy to find and order Western Star truck parts online. Whether you drive a 4900 or 5700, our goal is to keep your truck running at peak performance with minimal downtime. From must-have semi truck parts to hard-to-find upgrades, we offer affordable pricing, fast shipping, and expert support. Shop online truck parts today and keep your Western Star on the road and working hard.

Frequently Asked Questions About Western Star Truck Parts

What year models and series are your Western Star parts compatible with?

Our Western Star parts cover models from the early 2000s through current production years, including the 4700, 4800, 4900, 5700XE, and 6900 series. Each product listing specifies exact compatibility by year, model, and OEM range. For older Heritage models or specific configurations, we recommend contacting our support team with your OEM number to ensure proper fitment, as Western Star made several mid-year changes that can affect compatibility.

Are your aftermarket parts built to the same quality standards as OEM Western Star parts?

Our aftermarket parts are manufactured to meet or exceed OEM specifications, using heavy-duty materials like 304 stainless steel for chrome parts and 16-gauge steel for painted components. Many of our suppliers are the same manufacturers that produce parts for Western Star's assembly lines. Each part undergoes quality testing for proper fitment and durability. We back this with detailed warranties that match or exceed OEM coverage periods.

What are the most common installation challenges for Western Star bumpers and grilles?

The most frequent installation issues involve bracket alignment on 4900 series trucks due to frame variations, and electrical connections for LED-equipped bumpers on 5700XE models. Most installations require basic hand tools and take 2-4 hours. Pre-2010 models may need mounting hole modifications. We provide detailed installation guides with measurements, and our tech support can walk you through any fitment concerns before you start the installation.

What finish options are available, and how do they hold up in different climates?

We offer chrome-plated steel, polished stainless steel, painted steel, and powder-coated aluminum options. Chrome performs well in dry climates but requires regular maintenance in salt-heavy regions. Stainless steel offers the best corrosion resistance for coastal and winter road conditions. Painted finishes use automotive-grade primers and paints that resist chipping and fading for 5-7 years under normal conditions. Powder coating provides the most durable colored finish option.

Do you carry hard-to-find parts for discontinued Western Star models?

Yes, we maintain inventory for many discontinued models including the Heritage Classic, older 4900 variants, and pre-2005 4800 series trucks. Our network includes specialized manufacturers who produce limited runs of obsolete parts. If a part is not listed on our website, our parts specialists can often source it through our supplier network or recommend compatible alternatives that have been successfully used by other Western Star owners.


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