Frame & Chassis

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...

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...

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...

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.*...

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...

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...

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...

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...

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...

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...

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...

BESTfit 1/8 Inch Thrust Angle Shims For Peterbilt With Air Leaf SuspensionThe BESTfit 1/8 Inch Thrust Angle Shim is built to deliver precise thrust angle adjustments for heavy-duty trucks. Designed...