Frame & Chassis

BESTfit 3.53 Inch Center To Center X 2 Inch Wide Aluminum Side Bar Fits Kenworth T300The BESTfit Aluminum Side Bar is a high-quality replacement for your Kenworth T300, designed for strength and reliability. With 1.25 inch pin holes, 2-inch width, and 3...

BESTfit 5.063 Inch C To C Side Bar W/ 1/2 Inch Offset Replaces K20955, K20954, K20984* High Quality Side Bar* Dimensions:  - 7.50 Inch Length - 2.00 Inch Width - 5.063 Inch C To C - 1.125 Inch Height* Hole Size- 1.063 Inch* Lock Hole-...

BESTfit Shock Bracket StudRestore secure shock attachment with the BESTfit Shock Bracket Stud for Kenworth T660, engineered to replace K233-520. Featuring a 220.50 mm overall length and precision M16 x 2.00 and M20 x 2.50 threads, this lower shock stud...

BESTfit 34 x 9 1/2 Inch Step Panel For Lower Battery/ Tool BoxAt 4 State Trucks, we offer this 34 inch BESTfit replacement lower step panel for a Kenworth battery/toolbox. It is 9.5 inches wide and constructed of durable aluminum with tread to reduce...

BESTfit Battery Box Cover Fits KenworthThis battery box cover is built from durable diamond-plated aluminum and measures 34 inches in length. It's tough, reliable, and ready to protect your battery.* High Quality Battery Box Cover* Made Of Diamond Plated...

BESTfit Battery Box Cover With Built In Center StepProtect your battery with this economy style diamond plate aluminum battery box cover. It is 45 inches long and fits Kenworth W900A and W900B Kenworth models. The cover is made in North America and is...

BESTfit Upper Step Panel Fits KenworthDirect replacement aluminum step built for Kenworth trucks. Fits standard battery box and tool box configurations with 32-inch length. Professional-grade construction for daily use.* High Quality Upper Step Panel*...

BESTfit Diamond Plate Battery BoxAre you looking for a strong box to cover your battery at a great price? 4 State Trucks have what you need with this economy complete assembly battery box. Constructed with a durable and great looking diamond plate...

33.50 Inch End Of Frame Crossmember Fits PeterbiltUpgrade your rig with this high-quality Aluminum Rear Crossmember, designed to replace OEM part number 01-45151M000. Engineered for strength and durability, this lightweight aluminum crossmember offers...

Peterbilt U-Bolt For Mounting 9.5 Inch Diameter Air Tank By BESTfitEnsure reliable air tank installation on your Peterbilt with the BESTfit 9.5 Inch Stainless Steel Air Tank U-Bolt, engineered as a replacement for OE part G34-6009. Crafted from...

BESTfit 8 Inch Diameter Air Tank Mounting U-BoltThis BESTfit 8 Inch Diameter Air Tank Mounting U-Bolt Fits Peterbilt 359, 378 and 379 is designed to replace your factory style mounting U-bolts. Manufactured from the highest quality stainless steel and...

BESTfit 1/16 Inch Thrust Angle Shims For Peterbilt Air Leaf SuspensionsThe BESTfit 1/16 Inch Thrust Angle Shim is a precision-engineered suspension component designed to enhance alignment and handling for heavy-duty trucks. Crafted to fit a variety of...