Frequently Asked Questions About Kenworth T660 Steer Axle Springs & Hangers

What weight ratings are available for T660 steer axle springs, and how do I choose the right one?

Steer axle springs for the Kenworth T660 typically come in weight ratings from 12,000 to 20,000 pounds per axle. To select the correct rating, check your door jamb sticker for the front GAWR (Gross Axle Weight Rating) or consult your truck's specification sheet. Most T660 models use 12,000-14,000 lb springs for highway applications, while heavy-haul or vocational trucks often require 16,000-20,000 lb ratings. Choosing the wrong weight rating can affect ride quality, steering responsiveness, and tire wear.

Are these springs and hangers compatible with all T660 model years (2008-2017)?

While many springs and hangers fit across the T660 production run, there are important variations. Early models (2008-2010) may have different hanger spacing and mounting hole patterns compared to later years. Additionally, trucks with set-back axles or extended hoods require specific hanger configurations. Always verify compatibility using your VIN or by measuring your existing hanger length (typically 24", 26", or 28") and mounting hole spacing before ordering.

Can I replace springs and hangers myself, or do I need special tools?

While experienced mechanics can perform this replacement, it requires heavy-duty tools and safety equipment. You'll need a minimum 20-ton hydraulic jack, heavy-duty jack stands rated for commercial trucks, a 3/4" or 1" impact wrench, and spring compressors for safe removal and installation. The front axle must be properly supported throughout the process. Many customers find it more cost-effective to have a commercial truck shop perform the installation, which typically takes 3-4 hours for both sides.

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

OEM-style springs use standard steel construction and factory specifications, providing reliable performance for typical highway use. Heavy-duty aftermarket options often feature shot-peened steel for improved fatigue resistance, greaseable pins and bushings, and reinforced eyes. These upgraded springs typically last 20-30% longer under severe service conditions. For standard highway applications, OEM-style springs work well, but vocational trucks or those frequently running at maximum weight benefit from heavy-duty upgrades.

How can I tell if my springs and hangers need replacement?

Key indicators include visible cracks in spring leaves, separated or shifted leaves, worn or elongated mounting holes in hangers, excessive rust or corrosion, and uneven ride height side-to-side (more than 1/2" difference). Also watch for abnormal tire wear patterns on steer tires, wandering or pulling while driving, and clunking noises over bumps. Spring sag of more than 2 inches from the original ride height indicates immediate replacement is needed. Regular inspections during PM services can catch these issues early.