Frequently Asked Questions About Peterbilt 389 Glider Torque Rods & U-Bolts

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

Our torque rods and U-bolts are designed specifically for Peterbilt 389 glider kits from 2007 to present. They're also compatible with standard 389 models from the same years. However, if your truck has aftermarket suspension modifications or non-standard axle configurations, we recommend calling our tech support at 1-888-875-7787 to verify fitment before ordering.

Are these heavy-duty enough for vocational applications and heavy hauling?

Yes, our torque rods feature forged steel construction with heavy-duty rubber bushings rated for severe service applications. The U-bolts are Grade 8 heat-treated steel with a minimum tensile strength of 150,000 PSI. These components are built to handle maximum GVWR loads and are suitable for logging, heavy haul, and other demanding vocational applications.

Do I need special tools or professional installation for these components?

While basic hand tools are sufficient for U-bolt installation, torque rod replacement requires a torque wrench capable of 450-500 ft-lbs for proper installation. You'll also need jack stands rated for commercial trucks and potentially a bushing press for some applications. Most experienced mechanics can complete the installation in 2-3 hours per axle. Always follow Peterbilt's torque specifications for your specific axle configuration.

What's the difference between standard and heavy-duty torque rod options?

Standard torque rods use natural rubber bushings and are suitable for most on-highway applications. Heavy-duty options feature polyurethane bushings that last 2-3 times longer and provide better stability under extreme loads. Heavy-duty rods also have thicker rod bodies (1.75" vs 1.5" diameter) and reinforced end forgings. Choose heavy-duty if you regularly haul maximum legal weights or operate in severe conditions.

How do I know when my torque rods and U-bolts need replacement?

Inspect torque rods for cracked or separated bushings, bent rod bodies, or excessive play when prying with a bar. Replace immediately if you notice driveline vibration, rear axle hop, or unusual tire wear patterns. U-bolts should be replaced if you see thread stretching, corrosion pitting deeper than 1/16", or if they've been loosened and retorqued more than twice. As a rule, replace U-bolts every time you remove them for maintenance.