Frequently Asked Questions About Hino 238-338 Truck Torque Rods & U-Bolts

What years and models are these torque rods and U-bolts compatible with?

These torque rods and U-bolts are specifically designed for Hino 238 and 338 series trucks manufactured from 2005 to 2016. The 238 series includes models like 238LP, while the 338 series covers the 338CT and 338VT. Always verify your truck's exact model year and VIN before ordering, as there can be slight variations in suspension configurations between early and late production years.

Are these OEM quality or aftermarket parts, and what's the difference in durability?

We carry both OEM-specification and heavy-duty aftermarket options. OEM-spec parts match factory standards with rubber bushings rated for 100,000-150,000 miles under normal conditions. Our heavy-duty aftermarket torque rods feature polyurethane bushings that typically last 200,000+ miles and provide better vibration control. U-bolts are available in both Grade 5 (standard) and Grade 8 (heavy-duty) steel, with Grade 8 recommended for severe-duty applications or trucks carrying maximum loads regularly.

Can I install these myself, or do I need special tools?

While torque rod replacement is possible for experienced DIY mechanics, it requires specific tools including a torque wrench capable of 250-300 ft-lbs, proper jack stands rated for commercial vehicles, and ideally a bushing press. U-bolt installation is more straightforward but still requires precise torque specifications (typically 110-125 ft-lbs). Most customers report 3-4 hours for torque rod replacement and 1-2 hours for U-bolts. We strongly recommend professional installation if you lack commercial truck experience, as improper installation can cause dangerous handling issues.

What are the signs that my torque rods or U-bolts need replacement?

Common indicators include excessive cab shake or vibration, especially during acceleration or braking, visible cracks in torque rod bushings, rust or stretching on U-bolts, clunking sounds from the rear suspension, and uneven tire wear on drive axles. During inspection, look for oil contamination on rubber bushings, which accelerates deterioration. U-bolts should be checked for any elongation or thread damage. Replace these components immediately if you notice any of these symptoms to prevent more serious suspension damage.

What's included in the torque rod and U-bolt kits, and what else might I need?

Torque rod kits typically include the complete rod assembly with pre-installed bushings and necessary hardware. U-bolt kits come with 4 U-bolts, 8 hardened washers, and 8 deep nuts per axle. You may also need new spring perches or wear pads if yours show significant wear. Many customers also replace leaf spring bushings simultaneously since you're already working on the suspension. Anti-seize compound is recommended for U-bolt threads in areas with road salt exposure.