Frequently Asked Questions About Kenworth T660 Torque Rods & U-Bolts

What are the signs that my T660's torque rods need replacement?

Look for these key indicators: excessive driveline vibration, clunking noises during acceleration or deceleration, visible bushing wear or separation, and uneven tire wear patterns. If your truck pulls to one side or you notice the rear axle shifting during turns, inspect your torque rods immediately. Most drivers report these symptoms appearing between 250,000-400,000 miles, depending on load conditions and maintenance.

Will aftermarket torque rods and U-bolts fit my specific T660 model year?

Most quality aftermarket torque rods and U-bolts are designed to fit Kenworth T660 models from 2008-2015. However, variations exist based on suspension type (Airglide, AG400L, or spring), axle configuration, and wheelbase. Always verify compatibility by checking your truck's suspension model number located on the driver's side frame rail. For tandem axle setups, ensure you're ordering the correct length - typically 24.25" for most applications, but some configurations require 26" or 28" rods.

Can I install torque rods and U-bolts myself, or should I hire a professional?

While experienced mechanics can complete this job in 3-4 hours with proper equipment, it requires specific tools including a torque wrench capable of 450-500 ft-lbs, proper jack stands rated for commercial vehicles, and bushing removal tools. The most challenging aspect is achieving proper alignment to prevent premature wear. If you're not equipped to measure and adjust pinion angle or lack heavy-duty lifting equipment, professional installation is recommended to avoid driveline damage.

What's the difference between OEM and heavy-duty aftermarket torque rods?

OEM torque rods typically feature standard rubber bushings rated for 350,000-400,000 miles under normal conditions. Heavy-duty aftermarket options often use polyurethane or enhanced rubber compounds that last 25-40% longer and provide better vibration dampening. Premium aftermarket rods also feature thicker wall tubing (often 3/16" vs 1/8" OEM) and upgraded fasteners. For severe-duty applications or frequent heavy hauling, the aftermarket upgrade typically pays for itself through extended service life.

How often should I retorque U-bolts after installation?

Initial retorquing is critical - check U-bolt torque after the first 50-100 miles, then again at 500 miles. After that, inspect torque specifications every 10,000 miles or during regular PM services. Proper torque spec for most T660 U-bolts is 350-400 ft-lbs, but always verify with your specific suspension manufacturer's guidelines. Using new, hardened washers and nuts during installation helps maintain proper clamping force and reduces the frequency of retorquing needs.