If you own a trailer, RV, or utility trailer, chances are it rides on Dexter axles and suspension components. Dexter is a leading manufacturer of axle assemblies, leaf springs, torsion axles, brake systems, and related hardware. Whether you’re replacing worn parts, upgrading for better load capacity, or building a custom trailer, selecting the right Dexter suspension parts is critical for safety, ride quality, and longevity. This guide covers the main types of Dexter suspension systems, key components to consider, and practical advice for making a confident purchase.
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Dexter Axle (K71-359-00) Heavy Duty Suspension Kit
Understanding Dexter Suspension Systems
Dexter offers two primary suspension designs: leaf spring and torsion. Each has distinct characteristics that affect handling, maintenance, and comfort.
Leaf Spring Suspensions
Leaf spring systems use stacked steel leaves to absorb road shock and support the trailer’s weight. They are common on utility trailers, boat trailers, and many bumper-pull RVs. Dexter’s leaf springs come in various capacities (from 1,000 to 12,000 pounds per axle) and lengths to match different trailer designs. They are typically paired with slipper or equalizer setups, which allow the springs to flex and maintain axle alignment.
When to choose leaf springs:
- You need a cost-effective, durable system.
- Your trailer already uses leaf springs and you want a direct replacement.
- You prefer the ability to adjust ride height by adding or removing leaves.
Torsion Axles
Dexter’s torsion axles use a rubber cord or bar inside a square tube to absorb shock and provide independent wheel movement. They are popular on enclosed trailers, travel trailers, and specialty trailers because they offer a smoother ride, lower maintenance, and more ground clearance. Torsion axles are rated by capacity and spindle type, and they are available in various drop dimensions.
When to choose torsion axles:
- You want a maintenance-free suspension (no greasing or lubrication).
- You prefer better stability and reduced sway.
- You are building a new trailer or replacing a worn torsion unit.
Key Suspension Components
Beyond the axle itself, several other parts are part of the Dexter suspension system. Knowing these helps you order the correct parts and avoid compatibility issues.
Leaf Springs
Dexter leaf springs come in several styles: double-eye, one eye one slipper, and slipper-ended. They are available in different widths (1-3/4" for most trailers) and leaf counts. When ordering, you need the correct length (center-to-center of eyes or slipper pad) and the exact capacity per spring. Dexter’s part numbers include these details. For example, a common 2,000-pound leaf spring for a 3,500-pound axle assembly is labeled with its rated capacity.
Hangers, Shackles, and U-Bolts
These hardware pieces attach the springs to the trailer frame and axle. Dexter offers matched hardware kits that include hangers, shackle bolts, and U-bolts in the correct sizes. Using OEM hardware ensures proper fit and strength. U-bolts must match the axle tube diameter and spring width.
Torsion Axle Spindles and Hubs
For torsion axles, the spindle type determines which hubs and brakes fit. Dexter uses standard 1-inch, 1-1/16-inch, and 2-inch spindles for different capacity axles. When replacing a torsion axle assembly, confirm the spindle size and the bolt pattern of your existing wheels. Dexter also offers preassembled torsion units with hubs and brakes installed.
Brake Assemblies
Many Dexter suspension parts integrate electric brakes. The brake assembly includes the backing plate, magnets, shoes, and wiring. You can choose between self-adjusting and manual adjust designs. Dexter’s Nev-R-Adjust brakes are popular for their automatic brake shoe adjustment. Ensure the brake rating matches the axle capacity and that the flange pattern fits your axle.
Equalizers and Wet Bolts
On leaf spring trailers with tandem axles, an equalizer distributes weight between the two axles. Dexter’s E-Z Lube equalizers have grease fittings for easier maintenance. Wet bolts come with grease holes to lubricate the spring eye and bushing, reducing wear.
How to Choose Compatible Parts
Selecting the right Dexter suspension parts requires accurate specifications. Start with your trailer’s gross vehicle weight rating (GVWR) and the capacity of your current axles. Here are steps you can follow without crawling under the trailer:
- Check the axle tag. Dexter axles have a metal tag with the model number and capacity. This tag tells you the axle type, load rating, and spindle size.
- Measure the spring length. For leaf spring systems, measure from the center of one eye to the center of the other, or from eye to slipper end. Also note the width of the spring.
- Determine the drop or rise. Torsion axles often have a drop between the spindle center and the axle tube. A 0-degree drop means straight; negative drop (lower spindle) is common for lowered ride height.
- Note the bolt pattern. Wheel hubs have a bolt pattern (e.g., 5 on 4-1/2") that must match your wheels.
- Check brake type. If you have electric brakes, note whether they are 10-inch or 12-inch diameter, and the magnet style.
Once you have these measurements, you can order direct replacements from trailer parts suppliers or directly from Dexter distributors. If upgrading capacity, ensure the frame and other components are also rated for the higher load.
Quality and Durability Considerations
Dexter parts are known for durability, but not all components are created equal. Look for:
- Zinc-plated hardware that resists corrosion.
- Heavy-duty rubber cord in torsion axles with a high durometer for longer life.
- Self-lubricating bushings in leaf spring systems to minimize wear.
- Double-lip seals on hubs to keep grease in and water out.
Dexter also offers a Torflex line of torsion axles with a 6-year warranty, which is a sign of confidence in product longevity. For leaf springs, choose springs with interleaf pads to reduce friction and noise.
Installation and Maintenance Tips
While this article doesn’t replace a professional mechanic, knowing the basics helps you discuss the job with a technician or handle simple swaps. Leaf spring replacement involves lifting the trailer, supporting the frame, removing the U-bolts and shackle bolts, and installing the new spring with new hardware. Always replace U-bolts and nuts; they are one-time-use items.
For torsion axles, removal is similar but requires unbolting the axle from the frame. Because torsion axles hold alignment, mark the exact position before removal. After installation, check wheel alignment to prevent tire wear.
Maintenance varies by type:
- Leaf springs: Grease wet bolts every 12 months or 12,000 miles. Inspect for broken leaves or sagging.
- Torsion axles: No routine maintenance except checking spindle nut torque and bearings every year or 10,000 miles.
- Brakes: Adjust brakes annually (if manual) and inspect magnet and shoe wear.
Final Recommendation
For most trailer owners, sticking with original equipment Dexter parts is the safest choice. If you are replacing a worn suspension, buy the exact same model or an approved upgrade that matches your GVWR. For new builds, consider your typical load and terrain: leaf springs for budget and simplicity, torsion axles for ride comfort and low maintenance.
Always purchase from a reputable dealer that sells genuine Dexter products. Look for part numbers that start with Dexter’s prefix (e.g., 10- or 20-series for springs, 30-series for axles). Keep your axle tag information handy—it’s your best tool for getting the right parts the first time.
By understanding your trailer’s suspension system and the available Dexter components, you can make a smart purchase that keeps your trailer rolling safely for years.