GMC 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...

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...

BESTfit Oil PanOur black oil pan, capable of holding 16-20 quarts of oil, is available as an aftermarket replacement part, sold individually. * Oil Pan* Black* Oil Capacity 16-20 Quarts* Sold IndividuallyAftermarket Replacement Part (Not OEM)

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 Sanden 4308 Style AC Compressor With 2 Groove 152MM Clutch * High Quality A/C Compressor* 2 Groove 152MM Clutch* Sold Individually* Warranty On A/C Compressor Against Defects In Workmanship & Material From Date Of Purchase*** High Quality...

BESTfit Blue Silicone Heater Hose - 1 Inch X 25 Feet * High Quality Heater Hose* Made Of Silicone* Blue* 1.00 Inch ID * 25 Feet* Cut To Length * Sold Individually* Warranty On Heater Hose Against Defects In Workmanship & Material From Date Of...

BESTfit Exhaust Manifold Kit With Medium Angled Center Turbo MountThe exhaust manifold provided is a quality aftermarket replacement part designed for Detroit 60 Series engines. It comes as a 3-piece kit, including the front, center, and rear sections,...

BESTfit Aluminized Muffler 8 Inch Diameter With 5 Inch I.D. Inlet & Outlet * High Quality Muffler* Aluminized* Dimensions- 8 Inch Diameter- 5 Inch I.D. Inlet/Outlet- 14 Inch Length Body- 22 Inch Length Overall* Sold Individually* Warranty On Mufflers...

BESTfit White Fiberglass Vortex Generator By AerocapLooking for really good generators for your truck? These special ones, called Aerodynamic Vortox Generators VGS, are made by pilots. They're easy to put on ? just stick them around the back of your...

BESTfit Full FendersOur fiberglass Full Fender set is designed to provide durable protection for your vehicle's tires, with dimensions of 30.5 inches in height, 26 inches in width, and 103.5 inches in length. Suitable for tire sizes ranging from 22.5 to...

BESTfit Short Galvanized Muffler W/ 5 Inch ID Inlet & Outlet * High Quality Muffler* Made Of Galvanized Steel* 9 Inch Diameter Body* 12 Inch Body Length* Inlet 5 Inch Inside Diameter* Outlet 5 Inch Inside Diameter* Sold Individually* Warranty On Muffler...