Frequently Asked Questions About Mack CV/GU Truck Torque Rods & U-Bolts

What years and models of Mack CV and GU trucks do these torque rods and U-bolts fit?

Our torque rods and U-bolts are designed to fit Mack CV series trucks from 2000-2019 and GU series trucks from 2004-2015. However, specific applications can vary based on axle configuration and suspension type. We recommend checking your truck's VIN or calling our tech support at 1-888-875-2425 with your truck's model year and axle setup to ensure proper fitment before ordering.

Are these torque rods greaseable, and how often should they be serviced?

Most of our heavy-duty torque rods feature greaseable bushings with zerk fittings for easy maintenance. We recommend greasing them every 12,000-15,000 miles or during regular chassis lubrication intervals. Non-greaseable options with sealed bushings are also available for applications where maintenance-free operation is preferred. Each product listing specifies whether the torque rod is greaseable or sealed.

What grade of U-bolts should I use for my Mack CV/GU, and what torque specifications are required?

We stock Grade 8 U-bolts which meet or exceed OEM specifications for Mack CV/GU trucks. Torque specifications typically range from 250-300 ft-lbs for rear suspension U-bolts, but exact specs depend on your axle size and suspension type. Always consult your Mack service manual or the specification sheet included with your U-bolts for precise torque values. Over-torquing can cause premature failure.

Can I replace torque rods individually, or should I replace them in pairs?

While you can technically replace a single failed torque rod, we strongly recommend replacing them in pairs (both sides of the same axle) to maintain proper suspension geometry and prevent uneven wear. Mismatched torque rods can cause alignment issues, premature tire wear, and additional stress on other suspension components. For optimal performance and safety, replace torque rods as complete axle sets.

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

Common indicators include excessive play in the bushings (more than 1/8 inch movement), visible cracks in the torque rod body, worn or elongated bushing eyes, and loose or stretched U-bolts that won't maintain proper torque. You may also notice symptoms like rear-end sway, irregular tire wear, clunking noises during acceleration or braking, or visible rust and corrosion on U-bolt threads. Regular inspection during PM services can catch these issues early.