Frame & Chassis

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 Step Panel* Made Of...

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 Stainless Steel U-Bolt For Mounting 9.5 Inch Diameter Air TankThis 9.5 Inch Diameter Air Tank Mounting U-Bolt Fits Peterbilt 359, 378 and 379 is designed to replace your OE G34-6009 factory style mounting U-bolts. Manufactured from the highest...

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...

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 to improve alignment accuracy, this rugged and reliable...

BESTfit 3.625 To 19.625 Inch Adjustable Leveling Valve Linkage KitThe BESTfit 3.625 to 19.625 Inch Adjustable Leveling Valve Linkage Kit offers a versatile solution for precise suspension adjustments on heavy-duty trucks. Designed to fit a wide range of...

BESTfit Frame-Mount Bump Stop Fits Peterbilt New Low Air Leaf SuspensionsProtect your truck's suspension with the BESTfit Bump Stop, engineered to replace OEM part 01-52865 with precision fit and durability. This bump stop reduces suspension stress by...

BESTfit 6.625 Inch Center To Center U-Bolt Saddle For Peterbilt New Low Air Leaf SuspensionReplace your worn U-bolt saddle with the BESTfit 8.125 Inch OAL U-Bolt Saddle, made to match OEM 03-08712 specifications. Built from strong materials, it delivers...