Mack CH/CHN/CHU Truck Leaf Springs, Hangers & Acc.

Frequently Asked Questions About Mack CH/CHN/CHU Truck Leaf Springs, Hangers & Acc.

What years and models are these leaf springs compatible with?

These leaf springs are designed specifically for Mack CH, CHN, and CHU models manufactured from 1988 to 2007. The CH series includes standard day cabs, while CHN models feature set-back front axles, and CHU models have set-forward front axles. Always verify your truck's VIN and model designation before ordering, as suspension configurations can vary based on original equipment specs and GVWR ratings.

How difficult is it to install replacement leaf springs, and what tools do I need?

Installing leaf springs requires moderate to advanced mechanical skills and typically takes 4-6 hours per side. Essential tools include a heavy-duty jack and jack stands rated for commercial trucks, spring compressors, impact wrenches, torque wrenches capable of 450-500 ft-lbs, and proper safety equipment. Many customers report needing to heat seized bolts with a torch for removal. We strongly recommend professional installation if you lack experience with heavy truck suspensions, as improper installation can affect ride quality and safety.

What's the difference between OEM-style and heavy-duty aftermarket leaf springs?

OEM-style springs match original factory specifications for ride height and load capacity, typically rated between 12,000-20,000 lbs per axle depending on your model. Heavy-duty aftermarket options often feature additional leaves or upgraded steel alloys, providing 10-20% more load capacity and reduced sagging under heavy loads. However, heavy-duty springs may create a stiffer ride when running empty. Consider your typical payload and driving conditions when choosing.

How do I know when to replace spring hangers and bushings along with the leaf springs?

Inspect hangers for cracks, elongated bolt holes, or excessive rust when replacing springs. Worn hangers often show metal fatigue around mounting points or visible bending. Replace rubber bushings if they show cracking, compression set, or allow more than 1/8 inch of play. Most experienced mechanics recommend replacing bushings whenever you change springs, as labor costs are minimal when everything is already disassembled, and new bushings prevent premature spring wear.

Why are my new leaf springs sitting higher or lower than expected?

New springs typically sit 1-2 inches higher than worn springs and will settle after 500-1000 miles of normal driving. If height difference exceeds 2 inches, verify you received the correct part number for your specific suspension configuration - Mack trucks came with various spring pack options even within the same model year. Incorrect spring arch or leaf count will affect ride height. Also check that all spring hangers and shackles are properly torqued to specification, as loose components can alter suspension geometry.