Mack RD Truck Leaf Springs, Hangers & Acc.

Frequently Asked Questions About Mack RD Truck Leaf Springs, Hangers & Acc.

What year models of Mack RD trucks do these leaf springs fit?

Our leaf springs are designed to fit Mack RD series trucks from 1988 through 2004, including RD688, RD690, RD688S, and RD690S models. However, compatibility can vary based on your truck's specific configuration, such as single or tandem axle setups and suspension type. We recommend checking your VIN or contacting our support team with your truck's details to ensure proper fitment before ordering.

How difficult is it to replace leaf springs on a Mack RD, and what tools do I need?

Replacing leaf springs typically requires 4-6 hours for an experienced mechanic and involves heavy lifting equipment. You'll need a floor jack rated for at least 20 tons, jack stands, impact wrench, socket set (including 3/4" to 1-1/4" sockets), torque wrench, and spring compressor tools. The front springs are generally easier to replace than the rear. Due to safety concerns and the need for proper torque specifications, we recommend professional installation unless you have experience with heavy truck suspension work.

What's the difference between OEM and aftermarket leaf springs for Mack RD trucks?

OEM leaf springs are manufactured to Mack's original specifications and typically cost 30-50% more than aftermarket options. Quality aftermarket springs from reputable manufacturers use similar steel grades and heat treatment processes as OEM parts. The main differences are price and sometimes minor variations in arch height or spring rate. Our aftermarket options meet or exceed OEM specifications and come with warranties ranging from 1-3 years depending on the manufacturer.

How do I know when my leaf springs need replacement versus just new bushings or hangers?

Signs that indicate full spring replacement include: visible cracks in the leaves, broken or separated leaves, excessive sagging (truck sits more than 2 inches lower than normal), or severe corrosion. If your truck leans to one side, has uneven tire wear, or makes clunking noises over bumps, you might only need new bushings or shackles. Worn hangers typically show elongated bolt holes or cracks at stress points. A thorough inspection of all components is recommended before deciding on replacement parts.

Are heavy-duty leaf springs worth the extra cost for my Mack RD?

Heavy-duty springs are recommended if you regularly haul maximum loads, operate on rough terrain, or have added equipment like heavy bumpers or crane attachments. They typically have 2-3 additional leaves and can increase load capacity by 15-25%. However, they create a stiffer ride when empty. Standard capacity springs are sufficient for most highway and moderate load applications. Consider your typical payload and operating conditions - upgrading to heavy-duty springs when not needed can decrease ride quality and increase wear on other suspension components.