Kenworth T680 Leaf Springs, Hangers & Acc.

Frequently Asked Questions About Kenworth T680 Leaf Springs, Hangers & Acc.

What years of Kenworth T680 do these leaf springs fit, and are there differences between model variations?

Most leaf springs and hangers in this category fit Kenworth T680 models from 2013 to present. However, there are important variations based on your truck's configuration. Day cab and sleeper models may have different spring pack specifications, and trucks with different GVWR ratings require different spring capacities. Always verify your truck's VIN, model year, and suspension configuration before ordering. Check your door jamb sticker for the suspension code or contact us with your VIN for exact fitment verification.

How difficult is it to replace leaf springs on a T680, and what tools are required?

Replacing leaf springs requires intermediate to advanced mechanical skills and proper equipment. You'll need heavy-duty jack stands rated for commercial trucks, a floor jack capable of supporting the axle weight, spring compressors, and standard hand tools including impact wrenches. The job typically takes 4-6 hours per side for experienced technicians. Critical safety note: never attempt this repair without proper jack stands and spring compressors, as the stored energy in compressed springs can cause serious injury. Many customers opt for professional installation due to safety concerns and the need for alignment afterward.

What's the difference between OEM and aftermarket leaf springs for the T680?

OEM springs are manufactured to Kenworth's exact specifications and typically carry a higher price point but ensure perfect fit and ride characteristics. Quality aftermarket springs from reputable manufacturers often use the same steel grades and heat treatment processes as OEM but may cost 30-40% less. The main differences you might notice are in bushing materials and minor variations in arch height. Avoid economy springs that use lower-grade steel or skip heat treatment steps, as these can sag prematurely under load.

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

Inspect your springs for these replacement indicators: visible cracks in any leaf, separation between leaves, permanent sagging causing ride height loss of more than 2 inches, or broken leaves. If your springs are intact but you're experiencing clunking noises, wandering, or excessive play, you may only need new bushings or shackles. Worn bushings show cracking, separation from metal sleeves, or ovaling. Hangers should be replaced if you see cracks around bolt holes, elongated mounting holes, or rust-through. Many drivers replace bushings and shackles every 200,000-300,000 miles as preventive maintenance.

What weight capacity springs do I need for my T680 application?

Spring capacity depends on your truck's configuration and typical loads. Standard T680 highway tractors typically use 12,000-13,000 lb front springs and 40,000 lb rear tandem capacity. Heavy-haul or vocational specs may require 14,000-16,000 lb fronts and 46,000-52,000 lb rears. Check your door jamb weight rating sticker for front axle (FAWR) and rear axle (RAWR) ratings. Your springs should match or slightly exceed these ratings. Overloading springs accelerates wear and affects ride quality, while overrated springs create a harsh, bouncy ride when running empty.