EZGO heavy duty leaf springs exist for one reason: your cart is carrying more than the factory ever planned for, and the standard suspension is no longer up to the job.
The moment you add a rear flip seat, bolt on a cargo or utility bed, install a lift kit, or start hauling tools and gear across rough ground, the original springs begin to sag, bottom out, and wear faster than they should.
What once felt smooth turns harsh, the rear end squats under a load, and the ride height drops on one or both sides.
The fix is rarely complicated. A correctly matched heavy-duty rear spring restores ride height, protects the rest of your suspension, and gives the cart the load capacity it needs for the way you actually use it.
The trick is choosing the right spring for your specific EZGO model and powertrain, because the RXV, TXT, and Kawasaki-powered gas carts each use different parts that do not cross over.
This guide walks through how EZGO heavy duty leaf springs work, when a leaf spring upgrade makes sense, and exactly which spring fits your cart. Carts & Parts is an authorized EZGO dealer shipping the correct OEM parts nationwide, and you can always confirm fitment before you buy by calling (937) 459-8891.
Key Takeways
What are EZGO heavy duty leaf springs?
EZGO heavy duty leaf springs are reinforced rear springs built with thicker material or extra leaves to carry more weight than the standard OEM unit. They restore ride height and add load capacity for carts running rear seats, cargo beds, lift kits, or heavier loads.
When do I need a heavy duty leaf spring upgrade?
You need a leaf spring upgrade when you add weight beyond the factory two-passenger setup. Rear seat kits, utility beds, lift kits, off-road use, and commercial hauling all push standard springs past their limit and cause sagging and bottoming out.
Which heavy duty leaf spring fits my EZGO?
The correct spring depends on model and engine. The RXV uses PN# 20204 or OEM PN# 604494, while Kawasaki-powered gas models from 2009 to 2025 use the OEM 4-leaf PN# 605722. Always verify with your serial number.
Do heavy duty springs require new bushings?
A spring change is the right time to replace worn leaf spring bushings. The RXV kit is PN# SPN-0037 and the TXT kit is PN# SPN-0032. Fresh bushings protect the new spring and restore a quiet, controlled ride.
What Are EZGO Heavy Duty Leaf Springs and How Do They Work?
A leaf spring is a curved strip of spring steel mounted under the rear of your cart, clamped to the rear axle with U-bolts and pinned to the frame at each end. As the cart rolls over bumps or carries weight, the spring flexes and flattens, absorbing the load and then returning to shape. The standard EZGO spring is tuned for a stock two-passenger cart on smooth surfaces, which is fine until you change how the cart is used.
Heavy duty springs handle that change in two ways. Some use thicker, tapered material in a single mono-leaf design, while others stack multiple leaves so the spring resists flattening under far greater weight. Both approaches raise the spring rate, which is the amount of force needed to compress the spring. A higher spring rate means the rear end sits at the correct height under a load instead of sagging, and the cart stops bottoming out when you hit a dip or a curb with passengers and gear aboard.
The trade-off worth knowing up front is ride feel. Because a heavy-duty spring is stiffer, an empty cart rides a little firmer than it did on soft factory springs. Once you load the cart the way you normally use it, that stiffness is exactly what keeps the ride level and stable. For a complete picture of how springs, shocks, and bushings work together, the EZGO Suspension and Steering Parts Guide breaks down the full rear system.
When Should You Upgrade to Heavy Duty Leaf Springs?
A leaf spring upgrade earns its keep any time you push the cart past its original design weight. If you recognize your situation in the list below, your standard springs are working harder than they were built to:
- You added a rear flip or backseat kit. Two extra passengers can add 300 pounds or more behind the rear axle, which is where leaf springs do their work.
- You run a cargo box or utility bed. Tools, coolers, feed, sand, and equipment add up fast, and that weight rides directly over the rear suspension.
- You installed a lift kit and larger tires. Lifted carts see more flex and more load capacity demand, especially off pavement.
- You use the cart off-road or commercially. Rough terrain and daily heavy use fatigue standard springs years ahead of schedule.
- The rear end already sags or bottoms out. Visible squat, uneven ride height, or a clunk when loaded are clear signals the spring is overmatched.
If any of these describe your cart, a heavy-duty rear spring is the correct repair, not a luxury. Catching it early also protects the bushings, U-bolts, and frame mounts from the accelerated wear that comes with a flattened, overworked spring.
Which EZGO Heavy Duty Leaf Spring Is Right for Your Cart?
Choosing the right spring comes down to your model and powertrain. Carts & Parts stocks the three springs below for the most common EZGO applications, all genuine OEM units that fit and perform exactly as the factory intended.
EZGO RXV Heavy Duty Leaf Spring, PN# 20204
The EZGO RXV Heavy Duty Leaf Spring (PN# 20204) is a tapered mono-leaf spring built for RXV models carrying weight beyond the factory two-passenger configuration. If your RXV runs a rear seat kit, a cargo box, a lift kit, or sees regular off-road use, this spring delivers more load capacity than the standard OEM unit while keeping the clean, single-leaf design the RXV rear suspension was engineered around. It is sold individually, so plan on the quantity your build calls for.
OEM EZGO Heavy Duty Rear Leaf Spring, PN# 604494
The OEM EZGO Heavy Duty Rear Leaf Spring (PN# 604494) is a genuine E-Z-GO tapered heavy-duty spring designed for four-passenger vehicles. Fitment covers 2008 to 2018 RXV Gas Carbureted, 2008 to 2016 RXV Electric 48V, 2017 to 2021 RXV Electric Elite ADVB1, 2019 RXV Gas Kawasaki EFI, and 2010 to 2019 2FIVE models. It does not fit EX1 or ADVB2 models. This spring is sold individually and two are required per vehicle. The rear eyelet uses 624030 bushings and a 620161 spacer, both sold separately, so order them alongside the spring for a complete job.
OEM EZGO Heavy Duty Rear 4-Leaf Spring, PN# 605722
The OEM EZGO Heavy Duty Rear 4-Leaf Spring (PN# 605722) fits EZGO models powered by the Kawasaki engine from 2009 through 2025. Its 4-leaf construction provides significantly higher load capacity than the standard OEM spring, which makes it the correct factory upgrade for Kawasaki-powered RXV and gas carts adding rear seating, cargo weight, or a lift. Like the others, it is sold individually as one leaf spring. Always confirm fitment with your cart’s serial number before ordering, since Kawasaki-engine applications are specific.
Two of those springs ride on bushings that wear out on their own schedule, so a spring change is the natural moment to refresh them. The EZGO RXV Leaf Spring Bushing Kit (PN# SPN-0037) covers all RXV gas and electric models from 2008 up with 2 spacers and 4 bushings, while the EZGO TXT Leaf Spring Bushing Kit (PN# SPN-0032) fits TXT and Medalist models from 1994 through 2022 with 4 bushings and 2 spacers. The two kits use different dimensions and are not interchangeable.
“Their website is easy to use, they had the part that I needed in stock, shipping was included in the price, and the part was shipped promptly and carefully. What more could you ask for? 5 stars!” — Andrew Reehorst
How Do Heavy Duty Leaf Springs Improve Load Capacity and Ride?
The change is immediate the first time you load the cart. A correctly matched heavy-duty spring holds the rear at the proper ride height instead of squatting, which keeps your headlights aimed where they belong and your cart sitting level. Cornering feels more planted because the rear axle stays put under weight, and braking stays predictable because the suspension is no longer fully compressed before you ever touch the pedal.
There is a protective payoff too. When a standard spring is overloaded, the extra flex and bottoming out transfer shock straight into the bushings, U-bolts, and frame brackets, wearing them out early. Restoring the right load capacity with a heavy-duty spring spreads those forces the way the system was designed to handle them, which extends the life of the surrounding hardware and saves you a larger repair down the road.
“Great staff, quality products, attention to detail and of course spot on pricing. Highly recommended!” — Dennis Bruni
Installation and Fitment Tips for EZGO Heavy Duty Leaf Springs
Rear leaf spring work is within reach for most owners with a floor jack, jack stands, and basic hand tools. A few details make the difference between a job that lasts and one that comes back:
- Verify the part before you order. Model year and engine type decide which spring fits. Check the serial plate on the passenger-side frame rail, or call and read it to us.
- Support the cart safely. Use jack stands under the frame rails. Never work under a cart held up by a jack alone.
- Replace springs and bushings in pairs. If one side has worn, the other has the same miles on it and will follow soon. Doing both sides at once avoids a repeat visit.
- Inspect the hardware. Worn or corroded U-bolts and mounting bolts should be replaced, not reused, since they carry the load at the spring mount.
- Torque to spec. Tighten all fasteners to the values in your EZGO service manual for your model year.
Get the Right EZGO Heavy Duty Leaf Springs from Carts & Parts
Carts & Parts is a family-owned, authorized EZGO dealer in Union City, Indiana, serving customers nationwide since 2008. Every spring and bushing kit ships from a team that works on RXV, TXT, and Kawasaki-powered carts every day, so the same people answering your fitment questions are the ones turning wrenches in the shop. With free shipping on qualifying orders and more than 1,550 five-star reviews, getting the correct part is fast and straightforward. Call (937) 459-8891 to confirm your spring before you order, and lean on the EZGO Golf Cart Parts Guide when you want the full picture across every system on your cart.
“I can’t say enough about how pleased I am with my first transaction with Carts and Parts!!! I first reached out with a question on a Sunday afternoon, not expecting a reply until the next day, Monday. Much to my surprise, I get a text message asking how they could help within minutes of my request… Here I am, 3 days later, on Wednesday and I find the part on my doorstep… my cart is back on the road!! YeeHaw!! As a retired senior, I had almost forgotten that this is how customer service used to be.”
— Eddie
Frequently Asked Questions About EZGO Heavy Duty Leaf Springs
What are EZGO heavy duty leaf springs?
EZGO heavy duty leaf springs are reinforced rear springs that carry more weight than the standard factory unit. They use thicker tapered material or extra leaves to raise the spring rate, restore ride height, and add the load capacity needed for rear seats, cargo beds, lift kits, or heavier loads.
When should I upgrade to heavy duty leaf springs on my EZGO?
Upgrade when you add weight beyond the factory two-passenger configuration. Rear seat kits, cargo or utility beds, lift kits with larger tires, off-road use, and commercial hauling all overload standard springs and cause sagging, bottoming out, and faster wear.
How much extra load capacity do heavy duty leaf springs add?
Heavy-duty springs add capacity by raising the spring rate, with multi-leaf designs like the 4-leaf PN# 605722 carrying considerably more than a single standard leaf. Exact figures vary by spring and model, so confirm the right unit for your weight needs by calling (937) 459-8891.
Which heavy duty leaf spring fits an EZGO RXV?
An RXV uses the EZGO RXV Heavy Duty Leaf Spring (PN# 20204) or the OEM PN# 604494 depending on year and configuration. The 604494 fits a wide range of 2008 to 2021 RXV and 2010 to 2019 2FIVE models, but excludes EX1 and ADVB2.
What is the difference between PN# 604494 and PN# 605722?
The 604494 is a tapered heavy-duty spring for RXV and 2FIVE models, while the 605722 is a 4-leaf spring for EZGO Kawasaki-engine models from 2009 to 2025. The 4-leaf 605722 offers higher load capacity for Kawasaki-powered gas and lifted carts.
Do I need new bushings when I install heavy duty leaf springs?
A spring change is the ideal time to replace worn leaf spring bushings, since accessing the spring already requires removing them. Use the RXV kit PN# SPN-0037 or the TXT kit PN# SPN-0032, and note the 604494 also calls for 624030 bushings and a 620161 spacer, sold separately.
Do heavy duty leaf springs make the ride rougher?
Heavy-duty springs ride firmer than soft factory springs when the cart is empty, which is normal. The added stiffness is what keeps the cart level and controlled once you load passengers or cargo, so the ride feels right under the weight it was upgraded for.
Are these springs OEM or aftermarket?
The springs Carts & Parts stocks are genuine E-Z-GO OEM units, including PN# 604494 and PN# 605722. OEM springs match factory fit and performance, which avoids the U-bolt and fitment surprises that sometimes come with universal aftermarket parts.
How do I confirm the right heavy duty leaf spring for my cart?
Confirm the correct spring using your cart’s serial number, found on the plate on the passenger-side frame rail, since model year and engine type decide fitment. Call (937) 459-8891 and the Carts & Parts team will match the exact spring to your cart before you order.
