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Mack RD Trucks

Shop for aftermarket Mack RD truck parts (1979 – 2004) to repair, replace, and refurbish your heavy-duty vocational rig. We sell replacement and aftermarket parts for popular Mack RD models, including the RD600, RD688, RD688S, RD690, and RD690S. Source collision-replacement parts, customize the exterior, or add interior cab accessories to refurbish your truck at 4 State Trucks.
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  • BESTfit Cummins Water Pump W/ 96.5mm Pulley For Cummins ISC/ISL/QSL Engine Replaces 182092, 3959582

    BESTfit Cummins Water Pump W/ 96.5mm Pulley For Cummins ISC/ISL/QSL Engine Replaces 182092, 3959582

    BESTFIT TRUCK PARTS

    $158.99
    Water Pump W/ 96.5mm Pulley By BESTfit Replaces 182092, 3959582 Fits Cummins ISC/ISL/QSL EngineEnhance your cooling system with the BESTfit Cummins Water Pump with 96.5mm pulley, a direct replacement...
    29-07120140
    SKU:
    29-07120140
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Make:
    Universal Items
    Ready To Ship:
    Yes
    $158.99
    Qty in Cart: 0
    Price:
    $158.99
    Subtotal:
  • BESTfit Detroit Diesel Temperature Sensor For Detroit Engines Replaces 2120200002, DDEA6805401917, SKT283

    BESTfit Detroit Diesel Temperature Sensor For Detroit Engines Replaces 2120200002, DDEA6805401917, SKT283

    BESTFIT TRUCK PARTS

    $86.99
    Temperature Sensor By BESTfit Replaces 2120200002, DDEA6805401917, SKT283 Fits Detroit EnginesUpgrade your engine monitoring system with the BESTfit Detroit Diesel Temperature Sensor, a direct...
    29-07100080
    SKU:
    29-07100080
    Style Options:
    Detroit
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $86.99
    Qty in Cart: 0
    Price:
    $86.99
    Subtotal:
  • BESTfit Cummins Water Pump W/ 110 mm Pulley For Cummins 8.3L ISC/ISL/QSL Replaces 3286293, 4086, G4089647

    BESTfit Cummins Water Pump W/ 110 mm Pulley For Cummins 8.3L ISC/ISL/QSL Replaces 3286293, 4086, G4089647

    BESTFIT TRUCK PARTS

    $216.99
    Water Pump W/ 110 mm Pulley By BESTfit Replaces 3286293, 4086, G4089647 Fits Cummins 8.3L ISC/ISL/QSLEnhance your engine cooling system with the BESTfit Cummins Water Pump with 110 mm pulley, a...
    29-07120142
    SKU:
    29-07120142
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Make:
    Universal Items
    $216.99
    Qty in Cart: 0
    Price:
    $216.99
    Subtotal:
  • BESTfit Cummins EGR Cooler For Cummins Replaces 4955922, 4988884, 904333

    BESTfit Cummins EGR Cooler For Cummins Replaces 4955922, 4988884, 904333

    BESTFIT TRUCK PARTS

    $1,071.99
    EGR Cooler By BESTfit Replaces 4955922, 4988884, 904333 Fits CumminsEnhance your emissions system with the BESTfit Cummins EGR Cooler, a direct replacement for OEM part numbers 4955922, 4988884, and...
    29-07110016
    SKU:
    29-07110016
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $1,071.99
    Qty in Cart: 0
    Price:
    $1,071.99
    Subtotal:
  • BESTfit Cummins Temperature Sensor For Cummins Replaces 2872469, 4984757, SKT264

    BESTfit Cummins Temperature Sensor For Cummins Replaces 2872469, 4984757, SKT264

    BESTFIT TRUCK PARTS

    $177.99
    Temperature Sensor By BESTfit Replaces 2872469, 4984757, SKT264 Fits CumminsUpgrade your engine monitoring system with the BESTfit Cummins Temperature Sensor, a direct replacement for OEM part...
    29-07100087
    SKU:
    29-07100087
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $177.99
    Qty in Cart: 0
    Price:
    $177.99
    Subtotal:
  • BESTfit Detroit Diesel Temperature Sensor For Detroit Engines Replaces 04320774, 10031028, 2120200003

    BESTfit Detroit Diesel Temperature Sensor For Detroit Engines Replaces 04320774, 10031028, 2120200003

    BESTFIT TRUCK PARTS

    $73.99
    Detroit Diesel Temperature Sensor By BESTfit Replaces 04320774, 10031028, 2120200003 Fits Detroit EnginesUpgrade your engine monitoring system with the BESTfit Detroit Diesel Temperature Sensor, a...
    29-07100076
    SKU:
    29-07100076
    Product Type:
    Engine Parts
    Style Options:
    Detroit
    Make:
    Universal Items
    $73.99
    Qty in Cart: 0
    Price:
    $73.99
    Subtotal:
  • BESTfit Cummins Sensor For Cummins Replaces S27076, 4921729, 4903035

    BESTfit Cummins Sensor For Cummins Replaces S27076, 4921729, 4903035

    BESTFIT TRUCK PARTS

    $403.99
    Sensor By BESTfit Replaces S27076, 4921729, 4903035 Fits CumminsEnhance your engine emissions system with the BESTfit Cummins EGR Differential Pressure Sensor, a direct replacement for OEM part...
    29-07110015
    SKU:
    29-07110015
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Make:
    Universal Items
    $403.99
    Qty in Cart: 0
    Price:
    $403.99
    Subtotal:
  • BESTfit Cummins Sensor For Cummins Replaces 4384566, 5654170, SKT1307

    BESTfit Cummins Sensor For Cummins Replaces 4384566, 5654170, SKT1307

    BESTFIT TRUCK PARTS

    $529.99
    Sensor By BESTfit Replaces 4384566, 5654170, SKT1307 Fits CumminsUpgrade your engine monitoring system with the BESTfit Cummins Sensor, a direct replacement for OEM part numbers 4384566, 5654170, and...
    29-07100086
    SKU:
    29-07100086
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $529.99
    Qty in Cart: 0
    Price:
    $529.99
    Subtotal:
  • BESTfit Cummins Temperature Sensor For Cummins Replaces 5461615, A057K158, SKT1294

    BESTfit Cummins Temperature Sensor For Cummins Replaces 5461615, A057K158, SKT1294

    BESTFIT TRUCK PARTS

    $355.99
    Temperature Sensor By BESTfit Replaces 5461615, A057K158, SKT1294 Fits CumminsUpgrade your engine monitoring system with the BESTfit Cummins Temperature Sensor, a direct replacement for OEM part...
    29-07100083
    SKU:
    29-07100083
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $355.99
    Qty in Cart: 0
    Price:
    $355.99
    Subtotal:
  • BESTfit Warner Retrofit Kit K32 Replaces 10334070001

    BESTfit Warner Retrofit Kit K32 Replaces 10334070001

    BESTFIT TRUCK PARTS

    $601.99
    Warner Retrofit Kit K32 By BESTfit Replaces 10334070001Upgrade your cooling system with the BESTfit Warner Retrofit Kit K32, a direct replacement for OEM part number 10334070001. Designed for Borg...
    29-07060201
    SKU:
    29-07060201
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $601.99
    Qty in Cart: 0
    Price:
    $601.99
    Subtotal:
  • BESTfit Cummins Temperature Sensor For Cummins ISM Engines Replaces 0451235, 10031032, 2120750002

    BESTfit Cummins Temperature Sensor For Cummins ISM Engines Replaces 0451235, 10031032, 2120750002

    BESTFIT TRUCK PARTS

    $133.99
    Temperature Sensor By BESTfit Replaces 0451235, 10031032, 2120750002 Fits CumminsUpgrade your engine monitoring system with the BESTfit Cummins Temperature Sensor, a direct replacement for OEM part...
    29-07100082
    SKU:
    29-07100082
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $133.99
    Qty in Cart: 0
    Price:
    $133.99
    Subtotal:
  • BESTfit Cummins Sensor For Cummins Replaces 2131538, 4384562, 5654166

    BESTfit Cummins Sensor For Cummins Replaces 2131538, 4384562, 5654166

    BESTFIT TRUCK PARTS

    $278.99
    Sensor By BESTfit Replaces 2131538, 4384562, 5654166 Fits CumminsUpgrade your engine monitoring system with the BESTfit Cummins Sensor, a direct replacement for OEM part numbers 2131538, 4384562, and...
    29-07100085
    SKU:
    29-07100085
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $278.99
    Qty in Cart: 0
    Price:
    $278.99
    Subtotal:
  • BESTfit Cummins Temperature Sensor For Cummins Replaces 2511404C1, 5461614, A040P174

    BESTfit Cummins Temperature Sensor For Cummins Replaces 2511404C1, 5461614, A040P174

    BESTFIT TRUCK PARTS

    $281.99
    Temperature Sensor By BESTfit Replaces 2511404C1, 5461614, A040P174 Fits CumminsThe BESTfit Cummins Temperature Sensor is a premium replacement for OEM part numbers 2511404C1, 5461614, and A040P174,...
    29-07100079
    SKU:
    29-07100079
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $281.99
    Qty in Cart: 0
    Price:
    $281.99
    Subtotal:
  • BESTfit Magnet Repair Kit

    BESTfit Magnet Repair Kit

    BESTFIT TRUCK PARTS

    $690.99
    Magnet Repair Kit By BESTfitUpgrade your cooling system maintenance with the BESTfit Magnet Repair Kit, designed specifically for Horton fan clutch systems using electromagnetic activation. This...
    29-07060197
    SKU:
    29-07060197
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $690.99
    Qty in Cart: 0
    Price:
    $690.99
    Subtotal:
  • BESTfit Cummins EGT Temperature Sensor For Cummins ISB 6.7L 2011 Replaces 1906310, 1906310PE, 2129818

    BESTfit Cummins EGT Temperature Sensor For Cummins ISB 6.7L 2011 Replaces 1906310, 1906310PE, 2129818

    BESTFIT TRUCK PARTS

    $355.99
    Cummins EGT Temperature Sensor By BESTfit Replaces 1906310, 1906310PE, 2129818 Fits Cummins ISB 6.7L 2011The BESTfit Cummins EGT Temperature Sensor is a premium replacement for OEM part numbers...
    29-07100078
    SKU:
    29-07100078
    Product Type:
    Engine Parts
    Style Options:
    Cummins
    Make:
    Universal Items
    $355.99
    Qty in Cart: 0
    Price:
    $355.99
    Subtotal:
  • BESTfit Cummins Temperature Sensor For Cummins Replaces 2120750005, 2872467, 5EL026

    BESTfit Cummins Temperature Sensor For Cummins Replaces 2120750005, 2872467, 5EL026

    BESTFIT TRUCK PARTS

    $118.34
    Temperature Sensor By BESTfit Replaces 2120750005, 2872467, 5EL026 Fits CumminsUpgrade your engine monitoring system with the BESTfit Cummins Temperature Sensor, a direct replacement for OEM part...
    29-07100081
    SKU:
    29-07100081
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $118.34
    Qty in Cart: 0
    Price:
    $118.34
    Subtotal:
  • BESTfit Cummins Sensor For Cummins Replaces 0451231, 10021005, 2120752007

    BESTfit Cummins Sensor For Cummins Replaces 0451231, 10021005, 2120752007

    BESTFIT TRUCK PARTS

    $106.99
    Sensor By BESTfit Replaces 0451231, 10021005, 2120752007 Fits CumminsThe BESTfit Cummins Sensor is a high-quality engine sensor solution compatible with OEM part numbers 0451231, 10021005, and...
    29-07100075
    SKU:
    29-07100075
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $106.99
    Qty in Cart: 0
    Price:
    $106.99
    Subtotal:
  • BESTfit Super Repair Kit Replaces 109881, 1651839C91, 601158, 9500HP

    BESTfit Super Repair Kit Replaces 109881, 1651839C91, 601158, 9500HP

    BESTFIT TRUCK PARTS

    $691.99
    Super Repair Kit For Air Operated Fan Clutch By BESTfit Replaces 109881, 1651839C91, 601158, 9500HPUpgrade your cooling system with the BESTfit Super Repair Kit, a direct replacement for OEM part...
    29-07060193
    SKU:
    29-07060193
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $691.99
    Qty in Cart: 0
    Price:
    $691.99
    Subtotal:
  • BESTfit Cummins Temperature Sensor For Cummins Replaces 2120752035, 2872261, 2872261RX

    BESTfit Cummins Temperature Sensor For Cummins Replaces 2120752035, 2872261, 2872261RX

    BESTFIT TRUCK PARTS

    $162.99
    Temperature Sensor By BESTfit Replaces 2120752035, 2872261, 2872261RX Fits CumminsUpgrade your engine monitoring system with the BESTfit Cummins Temperature Sensor, a direct replacement for OEM part...
    29-07100077
    SKU:
    29-07100077
    Style Options:
    Cummins
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $162.99
    Qty in Cart: 0
    Price:
    $162.99
    Subtotal:
  • BESTfit Air Operated Fan Clutch 5 Inch Pilot Replaces 10900975001, 10900975001B, 10900990001

    BESTfit Air Operated Fan Clutch 5 Inch Pilot Replaces 10900975001, 10900975001B, 10900990001

    BESTFIT TRUCK PARTS

    $792.99
    5 Inch Pilot Air Operated Fan Clutch By BESTfit Replaces 10900975001, 10900975001B, 10900990001The BESTfit Air Operated Fan Clutch 5" Pilot is a high-quality replacement solution for OEM part numbers...
    29-07060203
    SKU:
    29-07060203
    Product Type:
    Engine Parts
    Make:
    Universal Items
    $792.99
    Qty in Cart: 0
    Price:
    $792.99
    Subtotal:
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Adding your products to cart

Shop Aftermarket Mack RD Truck Parts

Working, old-school big rigs like the Mack RD series endure many years of wear and tear on jobs sites. Over time, Mack RD hardware and components experience high heat and pressure, turning mild components replacements into system-wide repairs. We stock the model-specific mechanical parts to keep your hard-working truck performing day after day:

Cosmetic Aftermarket Upgrades for Mack RD Trucks

Road debris can chip away at the headlights, fenders, mirrors, and even mud flaps over time. That’s why we stock hundreds of exterior Mack RD replacement parts to replace damaged parts. Lastly, you can find decorative custom upgrades to spruce-up the look of your rig, from interior custom dashboards to stainless steel step boxes for easy cab exit and entry.

Frequently Asked Questions About Mack RD Truck Parts

What years and models of Mack RD trucks do your parts fit?

Our Mack RD parts are designed to fit RD600, RD688, and RD690 models manufactured from 1979 through 2004. However, compatibility can vary based on specific configurations and factory options. We recommend checking your OEM or contacting our team with your truck's model year and any special equipment codes to ensure proper fitment before ordering.

Are your Mack RD bumpers made from chrome-plated steel or stainless steel?

We offer both options depending on your needs and budget. Our chrome-plated steel bumpers feature a triple-chrome plating process over heavy-gauge steel for durability and shine. Our stainless steel options are typically 304-grade stainless with a mirror polish finish. Chrome bumpers are more affordable but require regular maintenance, while stainless steel resists corrosion better in harsh conditions but comes at a higher price point.

Do I need special tools or professional installation for Mack RD bumpers?

Most Mack RD bumper installations can be completed with standard shop tools including socket sets, wrenches, and a drill for any additional mounting holes. The bumpers typically weigh between 80-150 pounds, so having a helper or hoist is strongly recommended. Installation usually takes 2-4 hours. Some aftermarket bumpers may require minor modifications to mounting brackets or drilling new holes. Professional installation is recommended if you're not comfortable with heavy lifting or drilling.

What's the difference between OEM-style and aftermarket Mack RD parts?

OEM-style parts are manufactured to match original factory specifications for direct bolt-on replacement. Aftermarket parts may offer enhanced features like additional gauge holes, different styling, or heavier construction but might require modifications during installation. OEM-style parts typically maintain factory warranty compliance, while aftermarket options often provide better value and customization options. Both meet DOT standards when applicable.

How do I maintain chrome parts on my Mack RD to prevent rust and pitting?

Chrome parts require regular maintenance to maintain their appearance, especially in regions using road salt. Wash chrome surfaces weekly with mild soap and water, then dry thoroughly. Apply a quality chrome polish monthly and use a chrome sealant every 3-4 months for added protection. Avoid abrasive cleaners or steel wool which can scratch the chrome. For winter storage or harsh conditions, consider applying a thin coat of WD-40 or similar protectant, then remove before regular use.


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