Description
Part Number: 361-393
OEM No. 03-05110-155 ; (A) 1-14 ; (B) 3-1/2 ; ©= 15-1/2 ; Grade 8 ; Peterbilt Low Air
Product Overview
This heavy-duty U-bolt is used to clamp suspension components securely to the axle assembly. U-bolts are simple parts, but they carry a serious load every mile the truck moves. They help hold the suspension together and keep the axle properly positioned under the frame.
Over time, U-bolts stretch, corrode, or lose clamping force from constant load cycles and road vibration. Once that happens, suspension movement starts creating bigger problems fast.
What the Part Does
The U-bolt wraps around the axle and secures suspension components like spring assemblies and mounting plates tightly in place.
Proper clamping force is critical because even small movement between the axle and suspension can affect alignment, handling, and tire wear. These bolts handle enormous stress during braking, acceleration, cornering, and heavy hauling.
Common Problems This Part Solves
Worn or weakened U-bolts can cause:
- Loose suspension components
- Axle movement
- Uneven tire wear
- Clunking noises from the suspension
- Alignment problems under load
Rust and overloading are common causes of failure. In some cases, the threads become damaged during repeated tightening cycles.
Why Replacement Matters
A loose or stretched U-bolt can quickly turn into a serious suspension issue. Once clamping force is lost, suspension parts begin shifting under load, creating stress on springs, bushings, and axle components.
Replacing worn U-bolts helps maintain suspension stability and prevents more expensive repairs later.
Most suspension manufacturers also recommend replacing U-bolts instead of reusing old hardware during major suspension work.
Compatibility and Fitment
This U-bolt fits compatible heavy-duty truck suspension applications using part references 03-05110 and 155-361-393.
Always verify dimensions, thread size, bend width, and suspension application before ordering. Correct fitment is important because improper clamping can affect suspension performance and safety.
Installation and Service Notes
Installation requires even tightening of the U-bolt hardware to proper torque specifications. Uneven tightening can create poor clamping force and premature wear.
After installation, torque should be rechecked after initial use since new hardware can settle slightly under load.
This part is often replaced alongside suspension repairs involving a Front Hanger or suspension kit.
Use Case
Commonly used during suspension rebuilds, axle service, spring replacement, and heavy-duty maintenance work on high-mileage trucks.
About Us
We’re a family-owned group of Peterbilt dealerships dedicated to getting you the parts you need quickly and affordably. Whether you’re looking for Paccar OEM parts, reliable aftermarket replacements, or popular upgrades like seats and filters, we make it easy to keep your truck running and on the road. If you don’t see what you need online, just give us a call or send an email — chances are we can get it. We pride ourselves on fast service, fair prices, and being a partner you can depend on when downtime isn’t an option.
