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Freightliner M2 Business Class Parts

The Freightliner M2 Business Class semi-truck is a solid medium-duty truck that offers the versatility and reliability you'd expect from Freightliner, but we can make you stand out even more by customizing your semi truck with quality parts and chrome accessories from 4 State Trucks. When you drive an M2 Business Class, you'll enjoy top-notch features like maneuverability, roomy interior, and great driver visibility that make it fun and easy to keep your truck on the road. Whether you need bumpers, exhaust, fuel tanks, or any other aftermarket or custom parts for your M2, 4 State Trucks has got you covered - shop our selection of Freightliner parts today.
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  • Qty in Cart
  • Quantity
  • Price
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  • FREE SHIPPING OVER $249
    Automatic Bendix Slack Adjuster W/ 28 Spline & Straight Arm Replaces 137.2810

    Automatic Bendix Slack Adjuster W/ 28 Spline & Straight Arm Replaces 137.2810

    AFTERMARKET

    $78.99
    Automatic Bendix Slack Adjuster 5/8 Inch - 28 Cleves Thread, 1 Inch A/F & 1 Inch C To C Pin* High Quality Slack Adjuster* Automatic Bendix Type* 28 Spline Count* Straight Arm* Clevis Kit Bendix Type...
    09-05170511
    SKU:
    09-05170511
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $78.99
    Qty in Cart: 0
    Price:
    $78.99
    Subtotal:
  • FREE SHIPPING OVER $249
    MV3 Type Dash Valve Control Module W/ Integral Push-Lock-Connect Fittings Replaces 5009234, 801360

    MV3 Type Dash Valve Control Module W/ Integral Push-Lock-Connect Fittings Replaces 5009234, 801360

    AFTERMARKET

    $152.99
    MV3 Type Dash Valve 4.21 X 3 Inch C To C W/ 4 - .0275 Inch Diameter Bolt Holes* High Quality Dash Valve* MV3 Type Dash Control Module With Integral Push-Lock-Connect Fittings* Auxiliary Port Not...
    09-05170502
    SKU:
    09-05170502
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $152.99
    Qty in Cart: 0
    Price:
    $152.99
    Subtotal:
  • FREE SHIPPING OVER $249
    R12V Type Relay Valve W/ 4 PSI Crack Pressure & Mounting Brackets Replaces 170.065303

    R12V Type Relay Valve W/ 4 PSI Crack Pressure & Mounting Brackets Replaces 170.065303

    AFTERMARKET

    $54.99
    R12V Type Relay Valve 2.61 X 1 Inch C To C Bolt Holes W/ Service, Supply & Delivery Ports* High Quality Relay Valve* R12V Type Relay Valve* 4 PSI Crack Pressure* Mounting Bracket Included* Ports:  -...
    09-05170496
    SKU:
    09-05170496
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $54.99
    Qty in Cart: 0
    Price:
    $54.99
    Subtotal:
  • FREE SHIPPING OVER $249
    R12V Type Relay Valve W/ 4 PSI Crack Pressure & Mounting Bracket Replaces 170.065104

    R12V Type Relay Valve W/ 4 PSI Crack Pressure & Mounting Bracket Replaces 170.065104

    AFTERMARKET

    $52.99
    R12V Type Relay Valve 2.61 Inch C To C Bolt Hole Width W/ Service, Supply & Delivery Ports* High Quality Relay Valve* R12V Type Relay Valve* 4 PSI Crack Pressure* Mounting Bracket Included* Ports:  -...
    09-05170497
    SKU:
    09-05170497
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $52.99
    Qty in Cart: 0
    Price:
    $52.99
    Subtotal:
  • FREE SHIPPING OVER $249
    SR7 Spring Brake Valve W/ 2 - 1.38 Inch M1 Mounting Studs Replaces 170.K021560, K021560

    SR7 Spring Brake Valve W/ 2 - 1.38 Inch M1 Mounting Studs Replaces 170.K021560, K021560

    AFTERMARKET

    $172.99
    SR7 Spring Brake Valve W/ 3/8 PLC Control & Balance Port, 1/2 NPT Supply Port* High Quality Spring Brake Valve* SR7 Type Spring Brake Modulating Valve* Includes:  - 3/8 Inch PLC Control Port  - 3/8...
    09-05170507
    SKU:
    09-05170507
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $172.99
    Qty in Cart: 0
    Price:
    $172.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Haldex Type Air Regulator Valve 3.5 Inch Height Replaces 170.KN31070

    Haldex Type Air Regulator Valve 3.5 Inch Height Replaces 170.KN31070

    AFTERMARKET

    $80.99
    Haldex Type Air Regulator Valve W/ 3/8 NPT Inlet & Outlet Port, 3/8 Inch 24 Threaded Post* High Quality Air Regulator Valve* Haldex Type* Adjustable From 10 PSI To 125 PSI* Includes:  - (1) 3/8 Inch...
    09-05170498
    SKU:
    09-05170498
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $80.99
    Qty in Cart: 0
    Price:
    $80.99
    Subtotal:
  • FREE SHIPPING OVER $249
    E3 Type Single Circuit Foot Valve W/ 4 - 1/2 Inch NPT Delivery Ports

    E3 Type Single Circuit Foot Valve W/ 4 - 1/2 Inch NPT Delivery Ports

    AFTERMARKET

    $56.99
    E3 Type Single Circuit Foot Valve W/ 1/2 Inch NPT Supply Port & 1/4 Inch NPT Auxiliary Supply Port* High Quality Foot Valve* E3 Type Single Circuit Foot Valve* Ports:  - (4) 1/2 Inch NPT Delivery...
    09-05170503
    SKU:
    09-05170503
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $56.99
    Qty in Cart: 0
    Price:
    $56.99
    Subtotal:
  • FREE SHIPPING OVER $249
    RT4 Type Multifunction Relay Valve W/ 4 PSI Crack Pressure Replaces 170.KN26000

    RT4 Type Multifunction Relay Valve W/ 4 PSI Crack Pressure Replaces 170.KN26000

    AFTERMARKET

    $76.99
    RT4 Type Multifunction Relay Valve W/ Service Tank, Control, Supply, Reservoir & Deliver Ports* High Quality Relay Valve* RT4 Type Multifunction Valve* 55 PSI PPV Closing Pressure* 4 PSI Crack...
    09-05170492
    SKU:
    09-05170492
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $76.99
    Qty in Cart: 0
    Price:
    $76.99
    Subtotal:
  • FREE SHIPPING OVER $249
    MV3 Type Dash Valve Control Module W/ Integral Push-Lock-Connect Fittings Replaces 170.800840WF, 2506-188-C

    MV3 Type Dash Valve Control Module W/ Integral Push-Lock-Connect Fittings Replaces 170.800840WF, 2506-188-C

    AFTERMARKET

    $190.99
    MV3 Type Dash Valve 4.225 X 3 Inch C To C W/ 4 M6 X 1 - 6H Mounting Holes* High Quality Dash Valve* MV3 Type Dash Control Module With Integral Push-Lock-Connect Fittings* Operating Temp From -40 To...
    09-05170493
    SKU:
    09-05170493
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $190.99
    Qty in Cart: 0
    Price:
    $190.99
    Subtotal:
  • FREE SHIPPING OVER $249
    MV3 Type Dash Valve Control Module W/ Knobs, 2 Spool Manifold & 6 - 1/4 Inch NPT Ports Replaces 101890, 14539

    MV3 Type Dash Valve Control Module W/ Knobs, 2 Spool Manifold & 6 - 1/4 Inch NPT Ports Replaces 101890, 14539

    AFTERMARKET

    $125.99
    MV3 Type Dash Valve 4.187 X 3.031 Inch C To C W/ 4 - 1/4 Inch 20 Threaded Mounting Holes* High Quality Dash Valve* MV3 Type Dash Control Module With Knobs* Manifold 2 Spool* (6) 1/4 Inch NPT Ports*...
    09-05170494
    SKU:
    09-05170494
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $125.99
    Qty in Cart: 0
    Price:
    $125.99
    Subtotal:
  • FREE SHIPPING OVER $249
    QR1C Type Quick Release Valve W/ 5-8 PSI Crack Pressure Replaces 170800348, 800348

    QR1C Type Quick Release Valve W/ 5-8 PSI Crack Pressure Replaces 170800348, 800348

    AFTERMARKET

    $17.99
    QR1C Type Quick Release Valve W/ NPT Supply, Delivery & Balance Ports* High Quality Quick Release Valve* QR1C Type Quick Release Valve* Integral Double Check Valve* 5 - 8 PSI Crack Pressure* Ports: ...
    09-05170488
    SKU:
    09-05170488
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $17.99
    Qty in Cart: 0
    Price:
    $17.99
    Subtotal:
  • FREE SHIPPING OVER $249
    PPDC Type Dash Valve W/ Integral Push-Lock-Connect Fittings Replaces 065661, 065661BXW

    PPDC Type Dash Valve W/ Integral Push-Lock-Connect Fittings Replaces 065661, 065661BXW

    AFTERMARKET

    $132.99
    PPDC Type Dash Valve 3 -1/4 Inch 20 Threaded Mounting Holes, 3 X 2.54 Inch C To C* High Quality Dash Valve* PPDC Type Dash Valve With Integral Push-Lock-Connect Fittings* Ports:  - (2) 3/8 Inch PLC...
    09-05170489
    SKU:
    09-05170489
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $132.99
    Qty in Cart: 0
    Price:
    $132.99
    Subtotal:
  • FREE SHIPPING OVER $249
    SR7 Type Spring Brake Valve Replaces 170.K021557

    SR7 Type Spring Brake Valve Replaces 170.K021557

    AFTERMARKET

    $155.99
    SR7 Type Spring Brake Valve W/ Control, Balance, Supply & Delivery Ports* High Quality Spring Brake Valve* SR7 Type Spring Brake Modulating Valve* Ports:  - (2) 1/4 Inch NPT Control Ports  - (1) 1/4...
    09-05170499
    SKU:
    09-05170499
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $155.99
    Qty in Cart: 0
    Price:
    $155.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Spring Brake Control Valve W/ 3/8 Inch NPT Control Support & 3/8 Inch NPT Supply Port Replaces 170.110170

    Spring Brake Control Valve W/ 3/8 Inch NPT Control Support & 3/8 Inch NPT Supply Port Replaces 170.110170

    AFTERMARKET

    $86.99
    Spring Brake Control Valve W/ 2 - 1/2 Inch NPT Reservoir Ports & 4 3/8 Inch NPT Delivery Ports* High Quality Spring Brake Valve* Protected Reservoir Spring Brake Control Valve* Control And Supply...
    09-05170490
    SKU:
    09-05170490
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $86.99
    Qty in Cart: 0
    Price:
    $86.99
    Subtotal:
  • FREE SHIPPING OVER $249
    TP3 Type Tractor Protection Valve Rear Mounted Replaces 170.279000

    TP3 Type Tractor Protection Valve Rear Mounted Replaces 170.279000

    AFTERMARKET

    $26.99
    TP3 Type Tractor Protection Valve W/ .35 Inch Mounting Hole* High Quality Tractor Protection Valve* TP3 Type Tractor Protection Valve* Trailer Ports Are Both 1/2 in. NPT* Protects Tractor Air Supply...
    09-05170484
    SKU:
    09-05170484
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $26.99
    Qty in Cart: 0
    Price:
    $26.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Dash Valve MV3 Type Dash Control Module W/ Integral Push-Lock-Connect Fittings Replaces 170.800260, 170.800260WF

    Dash Valve MV3 Type Dash Control Module W/ Integral Push-Lock-Connect Fittings Replaces 170.800260, 170.800260WF

    AFTERMARKET

    $133.99
    Dash Valve 4.22 X 3 Inch C To C W/ 4 M5 X .8 - 6H Mounting Holes* High Quality Dash Valve* MV3 Type Dash Control Module With Integral Push-Lock-Connect Fittings* Operating Temp From -40 To 200...
    09-05170485
    SKU:
    09-05170485
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $133.99
    Qty in Cart: 0
    Price:
    $133.99
    Subtotal:
  • FREE SHIPPING OVER $249
    BPR1 Type Brake Proportioning Relay Valve W/ 4 PSI Crack Pressure Replaces 170.065145

    BPR1 Type Brake Proportioning Relay Valve W/ 4 PSI Crack Pressure Replaces 170.065145

    AFTERMARKET

    $63.99
    BPR1 Type Brake Proportioning Relay Valve W/ Control, Service, Supply & Delivery Ports* High Quality Relay Valve* BPR1 Type Brake Proportioning Relay Valve* 4 PSI Crack Pressure* Mounting Bracket...
    09-05170495
    SKU:
    09-05170495
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $63.99
    Qty in Cart: 0
    Price:
    $63.99
    Subtotal:
  • FREE SHIPPING OVER $249
    TP3DC Type Tractor Protection Valve W/ Double Check Valve Replaces 170.065706

    TP3DC Type Tractor Protection Valve W/ Double Check Valve Replaces 170.065706

    AFTERMARKET

    $80.99
    TP3DC Type Tractor Protection Valve W/ Primary, Secondary, Switch & Supply Ports* High Quality Tractor Protection Valve* TP3DC Type Tractor Protection Valve* Contains Double Check Valve* Ports:  -...
    09-05170486
    SKU:
    09-05170486
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $80.99
    Qty in Cart: 0
    Price:
    $80.99
    Subtotal:
  • FREE SHIPPING OVER $249
    D2 Type Governor W/ Gasket, 3 Plugs & ADIS Type Check Valve Kit Replaces 170.5004049

    D2 Type Governor W/ Gasket, 3 Plugs & ADIS Type Check Valve Kit Replaces 170.5004049

    AFTERMARKET

    $42.99
    D2 Type Governor W/ 105 PSI Cut-In & 125 PSI Cut-Out* High Quality Governor* D2 Type* Operating Temps From -40 To 200 Degrees Farenheit* 105 PSI Cut-In* 125 PSI Cut-Out* Non-Adjustable* Used In ADIS...
    09-05170480
    SKU:
    09-05170480
    Product Type:
    Air, Electrical, & Safety
    Make:
    Universal Items
    $42.99
    Qty in Cart: 0
    Price:
    $42.99
    Subtotal:
  • FREE SHIPPING OVER $249
    Brass Manual Air Tank Drain Valve W/ 5 Foot Steel Cable & Nitrile Seal Replaces 032082, 032160

    Brass Manual Air Tank Drain Valve W/ 5 Foot Steel Cable & Nitrile Seal Replaces 032082, 032160

    AFTERMARKET

    $7.99
    Brass Manual Air Tank Drain Valve W/ 1/4 Inch NPT Male Thread & 200 PSI Max Working Pressure* High Quality Drain Valve* Manual Air Tank Drain Valve* Pull Cable-Controlled* 1/4 Inch NPT Male Thread*...
    09-05170481
    SKU:
    09-05170481
    Product Type:
    Frame & Chassis
    Make:
    Universal Items
    $7.99
    Qty in Cart: 0
    Price:
    $7.99
    Subtotal:
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Adding your products to cart

When your Freightliner M2 Business Class is your daily workhorse, you need parts that can keep up. Whether you're hauling, delivering, or running job to job, our aftermarket parts and accessories help your rig stay sharp, strong, and road-ready.

Aftermarket Freightliner M2 Business Accessories

Our aftermarket semi truck parts are reliable, high-quality components—from front bumpers and grilles to lights, mirrors, exhausts, and more. Need engine parts to keep your powertrain smooth? Or custom touches to make your truck stand out? We’ve got it all.

Why Upgrade Your Semi Truck Parts?

- Built for performance: Get durable parts that stand up to heavy-duty jobs. - Boost your style: Chrome accents, lighting upgrades, and custom add-ons. - Fit you can trust: Designed to match the M2’s exact specs for a smooth install. - Versatile options: Perfect for owner-operators, fleets, and vocational trucks.
Whether you’re replacing worn components or tricking out your cab, the right parts make all the difference. Keep your Freightliner M2 Business Class looking great and running strong—mile after mile.

Frequently Asked Questions About Freightliner M2 Business Class Parts

What years and models of Freightliner M2 Business Class trucks do your parts fit?

Our parts are designed to fit Freightliner M2 Business Class trucks from 2003 to present. However, compatibility can vary by specific part type. For bumpers and body panels, there are typically three main design generations: 2003-2007, 2008-2017, and 2018-present. Always check the product description for exact year ranges, or contact our team with your OEM number to ensure proper fitment. Some parts may also fit the M2 106 and M2 112 variants, but verify compatibility before ordering.

Are aftermarket bumpers as durable as OEM parts, and what materials are they made from?

Quality aftermarket bumpers for the M2 Business Class are typically constructed from either heavy-duty steel (16-gauge or thicker) or high-impact ABS plastic, depending on the application. Steel bumpers often feature chrome plating or powder coating for corrosion resistance. While OEM parts meet factory specifications, many aftermarket options actually exceed OEM durability standards, especially those designed for vocational use. Look for bumpers with reinforced mounting brackets and proper drainage holes to prevent rust. We clearly specify material thickness and coating type in each product listing.

What are the most common installation challenges when replacing M2 Business Class bumpers?

The most frequent installation issues include: alignment with existing mounting holes (especially on 2008+ models where hole patterns changed), proper fitment around fog lights and sensors, and weight management during installation (steel bumpers can weigh 80-150 pounds). Many customers report needing to slightly enlarge mounting holes or use washers for proper alignment. We recommend having a second person assist with installation and using a floor jack to support the bumper during mounting. Installation typically takes 2-3 hours with basic tools, though vehicles with air dam systems or integrated step plates may require additional time.

What finish options are available, and which holds up best for different applications?

Common finishes include chrome-plated steel, polished stainless steel, painted steel, and textured plastic. For highway applications, chrome provides the classic look but requires regular maintenance to prevent pitting. Polished stainless steel costs more initially but resists corrosion better in salt-heavy regions. For vocational trucks in construction or waste management, painted steel bumpers with textured powder coating offer the best impact resistance and easy touch-up capability. Plastic bumpers work well for urban delivery trucks where weight savings and minor impact absorption are priorities.

Do I need to order additional hardware or brackets when buying a replacement bumper?

Most replacement bumpers come with new mounting brackets, but rarely include bolts, nuts, or washers. Plan to purchase Grade 8 hardware separately - typically you'll need 8-12 bolts (usually 1/2" or 5/8" diameter) with corresponding lock washers and nuts. Some installations may require bumper-to-frame adapter brackets if switching between bumper styles or upgrading from plastic to steel. Fog light brackets, license plate holders, and step plates are usually sold separately. Check if your existing hardware is reusable, but having new hardware on hand prevents installation delays.


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