Frequently Asked Questions About Kenworth T300-T450 Steer Axle Springs & Hangers

Will these springs and hangers fit my specific Kenworth T300-T450 model year?

Our steer axle springs and hangers are designed to fit Kenworth T300-T450 models from 1994 through 2007. However, there are variations based on your truck's GAWR (Gross Axle Weight Rating) and whether you have a set-back or set-forward axle configuration. Before ordering, check your door jamb sticker for the front axle weight rating and measure your existing spring length (typically 26" or 29"). If you're unsure, call us with your VIN and we'll help verify the correct parts.

What's the difference between OEM and aftermarket springs, and which should I choose?

OEM springs use multi-leaf construction with military-wrapped eyes and shot-peened leaves for maximum durability, typically lasting 500,000+ miles under normal conditions. Aftermarket options often use fewer leaves and standard wrapping, which can work well for lighter-duty applications but may require replacement sooner. For heavy-duty use or if you frequently haul at capacity, we recommend OEM or OEM-equivalent springs. Aftermarket springs can save you 30-40% upfront if your truck sees lighter duty or local delivery work.

Can I replace just the springs or do I need to change the hangers too?

While you can replace just the springs, we strongly recommend inspecting your hangers whenever you're changing springs. Look for cracks around the bolt holes, worn bushings, or bent brackets. If your hangers show any of these signs or have over 300,000 miles on them, replace them together with the springs. This prevents premature spring failure and ensures proper alignment. Replacing both together also saves labor costs since you're already doing the work.

What tools and expertise do I need for installation?

Installation requires a heavy-duty floor jack, jack stands rated for commercial trucks, spring compressors, and standard hand tools including a torque wrench. The job typically takes 3-4 hours per side for experienced mechanics. Critical steps include safely supporting the truck, properly torquing U-bolts to 110-120 ft-lbs in a cross pattern, and ensuring correct spring pin alignment. Many customers find it cost-effective to have a shop handle installation, as improper installation can cause premature wear or dangerous handling issues.

How do I know when my springs and hangers need replacement?

Key signs include: visible sagging when unloaded (compare side to side and measure ride height), cracked or broken leaves, shiny wear marks between leaves indicating loss of arch, excessive squeaking that persists after lubrication, and uneven tire wear on the front axle. Also inspect for rust pitting on the springs and any movement in the hanger bushings. If your truck pulls to one side or feels unstable during turns, have your springs inspected immediately. Regular inspections during oil changes can catch problems early.