Peterbilt 389 Glider Leaf Springs, Hangers & Acc.

Frequently Asked Questions About Peterbilt 389 Glider Leaf Springs, Hangers & Acc.

Will these leaf springs fit my specific year Peterbilt 389 glider kit?

Our leaf springs are designed to fit Peterbilt 389 glider kits from 2007 onwards. However, there can be variations depending on your specific suspension configuration (air ride vs. spring ride) and axle weight ratings. We recommend checking your VIN-specific build sheet or calling our tech support at 1-888-875-7787 with your truck's serial number to ensure proper fitment. Most standard 52,000 lb. and 46,000 lb. suspension setups are direct replacements.

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

OEM leaf springs are manufactured to Peterbilt's exact specifications and typically last 500,000-700,000 miles under normal conditions. Aftermarket options from reputable brands like Dayton Parts and Hendrickson often use the same steel grades and heat treatment processes but cost 30-40% less. For glider kits that see heavy-duty or vocational use, we recommend OEM or premium aftermarket brands. For highway applications, quality aftermarket springs provide excellent value without sacrificing performance.

Do I need to replace spring hangers and bushings when changing leaf springs?

While not always mandatory, we strongly recommend inspecting hangers and replacing bushings when installing new leaf springs. Worn bushings can cause premature spring failure and affect ride quality. Look for cracks in hangers, elongated bolt holes, or bushings with more than 1/8" of play. A complete refresh typically includes new bushings, shackle pins, and U-bolts. This adds about $200-300 to your parts cost but ensures optimal performance and prevents comeback issues.

Can I install these myself or do I need special tools?

Installation requires heavy-duty jack stands rated for commercial trucks, a 20-ton hydraulic jack, and standard hand tools including 3/4" and 1" drive socket sets. The job typically takes 4-6 hours per side for experienced mechanics. Critical steps include properly supporting the frame, maintaining correct ride height, and torquing U-bolts to specification (typically 350-450 ft-lbs). Many customers choose professional installation due to safety concerns and the need for proper alignment afterward. Budget $400-600 for professional installation at most truck shops.

How do I know when my leaf springs need replacement?

Common signs include: sagging ride height (measure from frame to ground and compare side-to-side), visible cracks in spring leaves, separated or shifted leaves, excessive rust between leaves, or a harsh ride quality. A 2-3 inch sag is typical replacement territory. Also check for broken center bolts or loose U-bolts during pre-trip inspections. Glider kits often retain original springs from donor trucks, so age-related fatigue is common even with low mileage. Regular inspection every 50,000 miles helps catch issues before roadside failures.