Mack Trucks

Thermocouple Teltek Digital PyrometerThe Teltek digital pyrometer can be paired with a reliable and high-quality thermocouple, available for individual purchase. Designed to meet your temperature measuring needs, this thermocouple provides accurate...

10-16V Voltmeter GaugeAt 4 State Trucks, we offer 2-inch Isspro voltmeters for your big rig. This aftermarket voltmeter features a range of 10-16 volts and comes with a warranty against defects in materials and workmanship. Isspro is a trusted brand for...

2-50p PSI Mechanical Turbo Pressure GaugeThis Isspro 2 inch mechanical turbo pressure gauge offers a 2-50 PSI limit and comes with a warranty against defects in materials and workmanship. Isspro is a trusted brand for any and all gauges, for over 60...

SS Performance 9 Speed Shift Pattern LabelThis stainless steel plate shows the shift pattern for a Eaton Fuller Performance 9 Speed (RTX). It fits most makes and models with an Eaton Manual Transmission. * High Quality Shift Pattern Label* Stainless...

0.180 Female Plugs W/ 6 Inch Lead Wire Harness * High Quality Wire Harness* 0.180 Female Plug* With 6 Plugs- 6 Inch Lead* Sold Individually* Warranty On Wire Harness Against Defects In Workmanship & Material From Date Of Purchase***High Quality...

Spring Loaded Light Bars W/ 6 - 4 Inch Round Light HolesIlluminate your vehicle's rear with our durable and versatile rear light bar, made from 304 stainless steel. Each bar is spring-loaded and includes screws for easy installation. Featuring a total of...

Chrome Plastic Bumper Guide Top W/ Amber Dome Lens For Bores Bumper GuidesUpgrade your vehicle's look with our chrome-plated plastic base bumper guide tops, designed to fit all bores guides seamlessly. Each pair includes amber lenses, enhancing...

BESTfit Cam ShaftUpgrade your engine's performance with our aftermarket Camshaft, available individually for hassle-free installation. Crafted with precision and durability in mind, this replacement part is designed to meet your engine's demands without...

BESTfit 4 Inch O.D. Aluminized Steel Exhaust Pipe Fits Mack RD * High Quality Exhaust Pipe* Aluminized Steel* Dimensions- 4 Inch Diameter- 4 Inch O.D. Diameter* Made in The USA* Sold Individually* Warranty On Exhausts Against Defects In Workmanship &...

BESTfit 4 Inch O.D.-I.D. X 48 Inch 16 Gauge Aluminized Steel TubeIntroducing our Straight Exhaust Tubing, meticulously crafted with Aluminized 12 Gauge Steel, ensuring durability and longevity. With a 4-inch diameter and 48-inch length, it offers...

BESTfit 20-10 Amp 12V Terminal RelayLooking for a replacement relay? Our aftermarket replacement part is designed for 12V systems and features a SPDT (Single Pole Double Throw) type with a capacity of 20-10 amps. It includes 5 terminals and does not have...

BESTfit Sanden Compressor Oil For Use With R-124A Sanden Compressors * High Quality Oil* 8.45 Oz * Sold Individually* Warranty On Oil Against Defects In Workmanship & Material From Date Of Purchase*** High Quality Aftermarket Replacement Part (Not...