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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
If your truck or trailer sags under a load or your Jeep’s rear end bounces over every crack in the pavement, the old leaf springs are past their prime. A worn set doesn’t just ruin ride quality — it lets your axle drift, chews through tires unevenly, and makes towing feel unstable. This guide cuts through the confusion over eye sizes, leaf counts, and load ratings so you pick the right pack for your rig the first time.
I’m Min Islam — the founder and writer behind Trending Car. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Crucially, the right leaf springs restore a factory ride height and keep your axle aligned, saving you from driveline vibration, premature tire wear, and an unsafe towing setup.
Our Picks at a Glance
How To Choose The Best Leaf Springs
Leaf springs seem simple — a stack of curved steel strips — but picking the wrong set is a direct route to a sagging tail, a rough ride, or an axle that wanders. Here is what actually matters when you are shopping.
Load Capacity: The True Limit Per Spring
Every spring pack has a rated capacity per spring, usually between 1,750 lb and 2,500 lb. That number is not the safe working load of the whole trailer — if you have a 3,500 lb axle, you need two springs adding up to over that rating. Do not buy a 1,750 lb cap set for a 5,000 lb trailer; it will flatten out and sag under the static weight alone.
Leaf Count and Ride Stiffness
More leaves mean heavier load support, but they also stiffen the unloaded ride. A 4-leaf pack rated at 2,500 lb is noticeably firmer than a 3-leaf pack at 1,800 lb. If you haul light loads most of the time, a lower leaf count keeps the daily drive comfortable without the harsh bounce of overloaded springs.
Fitment: Eye-to-Eye Length and Bushing Size
The distance from the center of one spring eye to the other — usually 25-1/4 inches on standard trailer springs — must match your hanger holes exactly. Also check the bushing inside diameter (often 9/16 inch) and the spring width (standard is 1-3/4 inches). One wrong measurement and the spring will not bolt up, no matter how much capacity it has.
Quick Comparison
| Model | Best For | Capacity per Spring | Leaf Count | Eye-to-Eye Length | Amazon |
|---|---|---|---|---|---|
| 10L0L Golf Cart Spring Kit★ Best Overall | EZGO TXT Upgrade | — | 4 | — | Amazon |
| SOUTHWEST WHEEL 2-Pack 3-LeafTop Performer | Light Trailer / Boat | 1,800 lbs | 3 | 25-1/4″ | Amazon |
| Youxmoto 4-Leaf Suspension KitBest Kit | 3,500 lb Trailer Rebuild | 1,750 lbs | 4 | 25-1/4″ | Amazon |
| Magorfas 4-Leaf 2,500 lb | 5,000 lb Trailer Heavy Load | 2,500 lbs | 4 | 25-1/4″ | Amazon |
| LIBRA 3,500 lb Suspension Kit | Full Trailer Build with Hangers | 1,750 lbs | 4 | 25-1/4″ | Amazon |
| SEHNSUCHT SW4B Rebuild Kit | Complete Trailer Swap | 1,750 lbs | 4 | 25-1/4″ | Amazon |
| SOUTHWEST WHEEL 3,500 lb Kit | Full Trailer Suspension Overhaul | 1,750 lbs | 4 | 25-1/4″ | Amazon |
| Dorman 929-301 Rear Spring | Jeep Cherokee / Comanche | — | — | 52″ | Amazon |
| Hellwig 1801 EZ-990 Helper | Truck / SUV Load Assistance | Up to GVWR | — | — | Amazon |
In‑Depth Reviews
1. 10L0L Heavy Duty Golf Cart Rear Leaf Spring Kit – 4-leaf Spring with Bushings & Sleeves for EZGO TXT Golf Cart 1995-2013
Our pick — over 4.5★ from 500+ verified ratings; the strongest balance of quality and price.
Stops your EZGO from bottoming out when you load up the rear seat or hitch.
This 4-leaf kit replaces the factory springs on gas and electric EZGO TXT models from 1994.5-up (except gas 2010+). The park bench test: riders report it adds roughly an inch of lift in the back and stops the suspension from hitting the stops when you carry passengers or tow. The carbon steel build feels heavier-duty than the original pack — owners use those exact words: “heavier duty than original springs, good performance.”
The kit arrives with bushings and stainless sleeves pre-installed, which saves the hassle of pressing them in yourself. The trade-off is stiffness: if you drive the cart empty with just a bag of corn on the back, the ride turns harsh. Some owners remove one leaf to soften it for light-duty use. Note that the U-bolts are sized for most carts but not all — measure your originals first.
Heavy Duty 4-Leaf
- 4-leaf steel pack prevents bottoming out with passengers or cargo
- Bushings and sleeves come pre-installed for quicker installation
- Matches OEM part numbers 70247-G01, 70474-G01, 70505-G01
Stiff Ride
- Stiff unloaded ride — best if you regularly carry weight on the cart
- No printed instructions included in the box
Best for Golf Carts: your EZGO TXT sags when you load the back seat or tow gear — the 4-leaf setup fixes that sag completely.
Not for Light Trailers: you drive empty most of the time; the stiffness will rattle you until you put some weight in the back.
2. SOUTHWEST WHEEL 2-Pack 3-Leaf Double Eye Trailer Leaf Spring (1800 lbs)
The go-to swap for Tracker boat owners who want a smoother tow than the factory single-leaf setup.
At 18 pounds per pair, this is noticeably lighter than the Youxmoto kit (28.7 pounds) — a weight of 18 pounds per pair versus the Youxmoto kit at 28.7 pounds that makes handling these springs on the garage floor easier. Each spring carries 1,800 lb capacity, so a pair handles a 3,600 lb trailer. The 3-leaf design rides softer than a 4-leaf pack, which matches the most common feedback: “they still ride very smooth” even when the buyer was worried 1,800 lb wasn’t enough for a heavier boat.
Buyers report these fit “perfectly on my Tracker boat trailer” — multiple owners of Tracker 175 TXW, Pro160, and Nitro single-axle trailers confirm zero fitment issues. The single-leaf replacements are noticeably more comfortable, and owners say they no longer worry about a sudden leaf failure dropping the wheel well onto a tire. The catch: with only 54 ratings versus bigger sellers, the sample is small, but the score holds at 4.8 stars.
Best for Light Loads: you are replacing a tired single-leaf on a small to mid-size boat trailer and want a smoother, safer ride.
Not for Heavy Use: you need a full suspension kit with hangers and U-bolts — this is springs only.
3. Youxmoto 3500lb Single Trailer Axle Suspension Kit 1750lb Leaf Springs & Ubolt Kit
A complete bolt-on rebuild for a 3,500 lb trailer, including springs, U-bolts, tie plates, and nuts.
The 4-leaf set delivers 1,750 lb capacity per spring — enough for a standard 3,500 lb single-axle trailer. But note the gap: the Magorfas spring (product 4) holds 2,500 lb per spring, which is 2,500 lb per spring compared to the Youxmoto’s 1,750 lb per spring. For heavier loads like a Nitro Z-18 boat trailer, the Youxmoto kit still impresses owners: “my old leaf spring snapped so I installed these and man does my trailer ride way smoother now.”
The kit includes 5-1/2-inch long U-bolts for 2-3/8 inch round axles, tie plates, and 1/2-20 hex nuts — everything except the hanger hardware. The anti-rust coating earns praise for corrosion resistance. Its shorter bolt-down list and sturdier feel compared to cheaper auto-store springs makes this a direct replacement for a busted SW4B setup. The overall ratings (4.6 stars across 95 ratings) back up the “good durable strong leaf springs for the price” consensus.
Best for DIY Builds: you have a 3,500 lb single-axle trailer and want a complete spring-and-U-bolt swap without hunting for extra fasteners.
Not for Quick Install: you are building a trailer from scratch and need hangers and shackles — this kit omits those.
4. Trailer Leaf Spring 4 Leaf Double Eye 2500 lbs Cap for 5000 lbs Axle Suspension
Handles the heaviest loads on a 5,000 lb trailer — 2,500 lb per spring with a thick 3/8-inch leaf profile.
While the Youxmoto and LIBRA kits cap at 1,750 lb per spring, this Magorfas-built set jumps to 2,500 lb per spring — a 2,500 lb per spring versus 1,750 lb per spring for heavier hauling. The steel is 60Si2Mn (manganese-alloy spring steel) with two coats of paint for corrosion resistance. At 29.1 pounds, it is 11 pounds heavier than the Youxmoto pair, which tracks with the thicker 3/8-inch leaves.
The internet verdict leans heavily positive: owners call out fit (10 mentions), quality (7), and value for money (6) as the top aspects. The obvious downside is that U-bolts are not included — you will need to buy those separately. Also, this spring is explicitly not for any automobile or truck. One owner’s package arrived busted with missing hanger brackets, though he fabricated replacements easily.
Best for Compact Trailers: you tow near the upper end of a 5,000 lb trailer capacity and want the safety margin of thicker, higher-rated springs.
Not for Long Frames: you want a complete kit with U-bolts and hardware — buy the Youxmoto or LIBRA kit instead.
5. LIBRA 3500lb Single Trailer Axle Suspension Kit | Leaf Springs & Hanger Kit
Everything except the axle itself — springs, hangers, shackles, and bolts for a full suspension rebuild.
LIBRA has been supplying the US OEM trailer industry for 16+ years, so this kit is engineered from real production experience. It includes 4-leaf springs at 1,750 lb each, plus two 3-inch tall hangers, two 2.1-inch tall hangers, four shackle straps, and six shackle bolts with locknuts. At 50.1 pounds, it is the heaviest single kit here because of all the steel hardware.
The quality scores well — top aspect praise is quality (6 mentions). But the spring quality aspect splits opinions as “mixed”; a few owners mention springs flattening and inverting under load. One customer received a kit missing a bushing. On the plus side, different buyers highlight unreal shipping speed (ordered Thursday night, arrived Monday) and outstanding customer service that replaced missing parts quickly. If you want a single box for a total suspension swap, this is it.
Best for Heavy Trailers: you are building a new trailer or gutting an old suspension down to the frame rails — the hanger kit saves sourcing parts separately.
Not for Smooth Ride: the mixed reports on spring longevity; inspect the leaves carefully before installation.
6. SEHNSUCHT 4 Leaf Trailer Spring, 3500lb Single Trailer Axle Suspension Kit
A 30-year-old trailer back on the road with new springs, hangers, and U-bolts in one box.
This kit comes closer than any other to a “cut-off-the-old-bolts, weld-on-the-new-mounts, bolt-everything-back-together” experience. It includes 4-leaf springs with 1,750 lb capacity, a hanger kit (2 x 3-inch tall hangers, 2 x 2.1-inch tall hangers, shackles, and bolts), and a U-bolt kit for 2-3/8 inch round axles. The carbon steel construction gets an anti-rust coating for longevity.
One owner documented replacing the entire suspension on a 30-year-old single-axle utility trailer — “cut off all the original mounts, welded on the new mounts, and bolted the springs and axle back on. Perfect so far.” Another says “fitment was perfect, included all hardware and shackles.” The 5/16-inch leaf thickness is thinner than the Magorfas 3/8-inch leaves, so heavy loaded duty should be considered. Across 51 ratings, it holds a 4.7-star average.
Best for Durability: a complete suspension overhaul where you want to replace rusted hangers and shackles alongside the springs.
Not for Corrosion Resistance: your existing hangers are solid and you only need springs — you will have leftover hardware.
7. SOUTHWEST WHEEL 3,500 lbs. Trailer Axle Suspension Kit Incl. Leaf Springs, Shackle & U-Bolt kit
The most-reviewed kit on the list — 237 owners put it through the wringer, and 4.6 stars is the result.
This is the bundle that keeps coming up in forum threads: two 4-leaf double-eye springs (1,750 lb each), a single shackle kit, and a 2-3/8 inch round U-bolt kit, all at a mid-range price point. The single strongest signal is quality — 27 owners single it out, followed by fit (22 mentions) and installation ease (17 mentions). Several customers note “Made in USA” stamped on the components, which matters for replacement parts on older American-built trailers.
Multiple Tracker boat trailer owners call it a “nice upgrade” over worn factory springs, and one owner praised the support team directly when he called with questions. The recurring caution is a durability rating that shows up as “mixed” in the aspects — a few owners question long-term life, though the general sentiment remains strongly positive. At 30 pounds, this kit is noticeably lighter than the LIBRA (50.1 lb) because it omits the hanger brackets.
Best for New Builds: you want the most peer-validated leaf-spring-and-hardware package on the market right now.
Not for Retrofits: you need hanger brackets — this includes only the springs, shackle kit, and U-bolts.
8. Dorman 929-301 Rear Leaf Spring Compatible with Select Jeep Models
The direct fit for a sagging Jeep Cherokee — lifts the rear back to where it should be.
At 52 inches long and 31.6 pounds, this is a completely different class of leaf spring — vehicle replacement, not trailer. The Dorman 929-301 is engineered to replace the original leaf springs on specific Jeep models (XJ Cherokee, MJ Comanche) and matches the dimensions of OEM part numbers 4886185AB, 4886187AB, and 52000545AB. Owners consistently report the package adds roughly 2 inches of lift over sagged factory springs, eliminating bottoming out with four people and gear.
The top aspect is fit, with 54 owners calling it spot-on. Quality (46 mentions) and ride quality (41 mentions) run close behind. The nuance: these springs can take up to 10 months and 11,000 miles to settle to normal ride height — owners note the rear sits high for the first year. Also, removing old springs on a rust-belt vehicle is not a simple afternoon job; owners advise planning for an air chisel, torch, and fresh hardware. Bushings come pre-installed.
Best for Jeep Owners: restoring ride height on a Cherokee or Comanche with sagged or broken rear springs — the 54 fits-approval is hard to argue with.
Not for Trailers: be prepared for a tough removal if you live in the salt belt; the bushing sleeve can rust-weld itself to the bolt.
9. Hellwig 1801 EZ-990 Helper Spring Kit, Step Bracket Style Leaf, 2.5″
Bolt-on load support for your truck’s existing leaf pack — no spring swap, just add-on help.
This is different from every other pick here. The Hellwig EZ-990 sits on top of your factory leaf springs and works alongside them to increase the level load rating up to the vehicle’s gross vehicle weight rating. It is not a replacement spring; it is assistance for when your truck squats under a camper or a heavy load. The steel is heat-treated ASTM 5160 alloy spring steel, made in California, and the kit is fully adjustable via heavy-duty U-bolts.
The top aspect is installation — 59 owners call it straightforward. One owner describes a 20-minute install per side. The result is a near-factory ride feel with a load in the bed, and the kit has held up for 5+ years without squeaking according to some long-term users. The most common downside: fitment is uneven (some trucks work, others need modification), and a handful of buyers found U-bolts were too short for their specific spring pack. There are also isolated complaints about missing nuts in the box.
Best for Load Support: your truck or SUV sags under a slide-in camper or heavy load but you want to keep the stock spring ride when empty.
Not for Off-Road: your leaf springs are already rusted or broken — this helper assumes a healthy main pack to mount on top of.
Understanding the Specs
Load Capacity Per Spring
This number (1,750 lb, 1,800 lb, 2,500 lb) tells you how much weight one individual spring can support before it flattens out. For a trailer, add both springs together and match the total to your axle rating. Always leave a margin — a 1,750 lb spring pair supports 3,500 lb, which is right at the axle limit; going higher never hurts.
Leaf Count vs Ride Comfort
If you drive a daily truck that only hauls sometimes, a 3-leaf pack soaks up bumps better when the bed is empty. But if you run a trailer that is always near its max load, a 4-leaf pack gives you the extra durability you need — even though it rides stiffer with an empty bed.
FAQ
How do I know what length leaf spring I need for my trailer?
Can I replace just one leaf spring on my trailer?
Will a 4-leaf spring ride too rough on my empty boat trailer?
How do I know if my Jeep’s leaf springs are worn out?
What does helper spring mean and when would I need one?
How do I measure the U-bolt size I need for new leaf springs?
What is the difference between double-eye and slipper-style leaf springs?
How long do leaf springs typically last?
Are the bushings pre-installed on these leaf springs?
Will these leaf springs fit my car or SUV that originally had coils?
Final Thoughts: The Verdict
For most buyers, the leaf springs winner is the 10L0L Heavy Duty Golf Cart Kit because it directly solves the EZGO TXT sag problem with a 4-leaf carbon steel pack that stops bottoming out under load. If you want a complete trailer suspension rebuild with springs, hangers, U-bolts, and shackles, the SOUTHWEST WHEEL 3,500 lb Kit is the most-reviewed choice with proven quality. And for truck owners who need load support without replacing the whole pack, the Hellwig 1801 EZ-990 bolts on in about 20 minutes and restores that stable, factory-like ride when you are towing heavy.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Trending Car earns from qualifying purchases. This does not affect which products we feature.