Frequently Asked Questions About Peterbilt 352 Drive Axle Springs & Hangers
What are the weight capacity ratings for Peterbilt 352 drive axle springs, and how do I choose the right one for my truck?
Peterbilt 352 drive axle springs typically come in capacities ranging from 20,000 to 46,000 pounds per axle set. To select the correct spring capacity, check your truck's door jamb sticker or spec sheet for the GAWR (Gross Axle Weight Rating). For heavy-haul applications, consider springs rated 10-15% above your typical loaded weight to prevent sagging and premature wear. Multi-leaf springs generally offer better stability than single-leaf designs for heavier loads.
Will these springs and hangers fit my specific year Peterbilt 352, and are there differences between model years?
Most drive axle springs and hangers for the Peterbilt 352 are compatible across the entire production run (1969-1980). However, there are two main hanger styles: the early style (1969-1974) with a 3-inch pin spacing and the later style (1975-1980) with a 3.5-inch spacing. Always verify your existing hanger measurements before ordering. Springs themselves are typically interchangeable if the capacity and length match your specifications.
What tools and equipment do I need to replace drive axle springs and hangers myself?
You'll need a heavy-duty floor jack (minimum 20-ton capacity), jack stands rated for commercial trucks, a 3/4-inch drive socket set, spring compressors, a cutting torch for stubborn bolts, and safety chains. The job typically takes 4-6 hours per side with proper equipment. Critical safety note: never work under a truck supported only by jacks. Many customers report that renting a truck lift or having a shop press out old bushings saves significant time and reduces injury risk.
What's the difference between OEM-style and heavy-duty aftermarket springs for the Peterbilt 352?
OEM-style springs use standard carbon steel with 5-7 leaves, while heavy-duty aftermarket options often feature shot-peened, heat-treated alloy steel with 7-11 leaves for improved durability. Heavy-duty springs typically last 30-40% longer under severe service conditions but provide a stiffer ride when empty. For trucks that frequently run empty, progressive-rate springs offer the best compromise between loaded capacity and unloaded ride quality.
How often should I inspect and maintain my drive axle springs and hangers?
Inspect springs and hangers every 3 months or 25,000 miles, whichever comes first. Look for cracked or broken leaves, worn bushings (play exceeding 1/8 inch), and rust penetration beyond surface level. Lubricate shackle pins and bushings every oil change with heavy-duty chassis grease. Replace springs when you notice sagging exceeding 2 inches from the original arch, any broken leaves, or separation between leaves. Most Peterbilt 352 springs last 150,000-250,000 miles under normal freight hauling conditions.
