Need a helper spring that keeps your truck level under load. Pick a model that matches your vehicle, load weight, and leaf-pack type.
Consider TORCH for Tacomas, Ford F-150-specific kits, heavy-duty Hellwig 550 or 1801 alloy-steel options, 2,000 lb helpers for serious towing, Wyckoff or 500 lb units for light loads, and universal TSS-107-40 or 500 lb trailer kits for trailers.
Check U-bolt thread length, adjustability, and coating to get the best fit and longevity.
| TORCH Rear Add-A-Leaf Lift Kit for Toyota Tacoma |
| Best Tacoma Fit | Purpose: Rear suspension lift / load support (add-a-leaf) | Mounting Style: Bolt-on (add-a-leaf integrated into leaf pack) | Adjustability: None specified beyond fit; relies on leaf pack condition | VIEW LATEST PRICE | Read Our Analysis |
| Rear Leaf Spring Suspension Kit for Ford F-150 4WD |
| Best F-150 Upgrade | Purpose: Rear leaf spring replacement/strengthening for load support | Mounting Style: Bolt-on to factory mounting points (complete kit) | Adjustability: Not specifically adjustable; designed to match factory mounts | VIEW LATEST PRICE | Read Our Analysis |
| Trailer Auxiliary Helper Spring Kit TSS-107-40 (2-Pack) |
| Trailer-Specific Solution | Purpose: Trailer auxiliary/helper springs for supplemental support | Mounting Style: Bolt-on to existing trailer leaf spring assembly | Adjustability: Fixed helper spring design (placement above/below pack) | VIEW LATEST PRICE | Read Our Analysis |
| Wyckoff 500 lb Leaf Spring Helper Kit |
| Best Light-Duty Capacity | Purpose: Add-on helper springs to increase rear capacity (500 lb) | Mounting Style: Bolt-on to existing rear leaf springs (uses U-bolts) | Adjustability: Adjustable tension via included U-bolts | VIEW LATEST PRICE | Read Our Analysis |
| Hellwig 550 EZ-550 Helper Spring Kit |
| Easy-Adjust Helper | Purpose: Helper springs to increase level load capacity (≈500 lb) | Mounting Style: Bolt-on on top of rear leaf springs | Adjustability: Adjustable via heavy-duty U-bolts (independent adjustment) | VIEW LATEST PRICE | Read Our Analysis |
| Rear Leaf Spring Helper for Chevy/GMC 1500 (1990-2024) |
| Best Chevy/GMC Support | Purpose: Rear helper spring to add strength and reduce squat for towing | Mounting Style: Bolt-on complete kit (no special tools) | Adjustability: No readjustment required after install (not adjustable) | VIEW LATEST PRICE | Read Our Analysis |
| Hellwig 987 EZ-990 Helper Spring Kit |
| Heavy-Duty Versatile | Purpose: Helper spring to increase level load capacity (medium-duty) | Mounting Style: Bolt-on on top of rear leaf springs | Adjustability: Fully adjustable via included U-bolts (independent adjustment) | VIEW LATEST PRICE | Read Our Analysis |
| Helper 2000 lb Heavy-Duty Leaf Spring Load Assist |
| Maximum Load Capacity | Purpose: Heavy-duty load assist to add up to 2,000 lb capacity | Mounting Style: Bolt-on on top of rear leaf springs (uses U-bolts) | Adjustability: Fully adjustable via heavy-duty U-bolts | VIEW LATEST PRICE | Read Our Analysis |
| 500 lb Heavy Duty Trailer Helper Spring Kit |
| Midrange Trailer Support | Purpose: Trailer/helper spring to add up to 500 lb support | Mounting Style: Bolt-on on top of rear leaf springs | Adjustability: Not explicitly adjustable (bolt-on support) | VIEW LATEST PRICE | Read Our Analysis |
| Hellwig 1801 EZ-990 Helper Spring Kit Step Bracket Style Leaf 2.5″ |
| Best for Small Trucks | Purpose: Helper spring (step bracket style) to increase level load capacity (up to 2,000 lb) | Mounting Style: Bolt-on (step bracket style) on top of rear leaf springs | Adjustability: Fully adjustable using included U-bolts (independent adjustment) | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
TORCH Rear Add-A-Leaf Lift Kit for Toyota Tacoma
Should you want a simple, reliable way to lift the rear of your Toyota Tacoma without swapping springs, the TORCH Rear Add-A-Leaf kit is a solid pick for DIYers and daily drivers alike. You’ll get roughly 1.5 to 2 inches of rear lift, though the exact gain depends on your current leaf pack condition. The bolt-on kit includes two 2/5 inch add-a-leaf pieces, extended alignment pins, and isolator pads. You’ll follow clear step-by-step instructions, but you must have at least half a thread left on your factory U-bolts. TORCH backs it with a lifetime warranty and responsive support.
- Purpose:Rear suspension lift / load support (add-a-leaf)
- Mounting Style:Bolt-on (add-a-leaf integrated into leaf pack)
- Adjustability:None specified beyond fit; relies on leaf pack condition
- Construction / Material:Steel add-a-leaf pieces (2 pieces, 2/5″ thick) with isolator pads
- Installation Complexity:DIY bolt-on with step-by-step instructions; requires 1/2 thread left on U-bolts
- Intended Use Cases:Lift and add rear load support for Toyota Tacoma towing/hauling
- Additional Feature:Vehicle-specific fitment range
- Additional Feature:Includes alignment pins
- Additional Feature:Lifetime warranty
Rear Leaf Spring Suspension Kit for Ford F-150 4WD
Should you haul heavy gear, tow a trailer, or hit rough trails often, this rear leaf spring suspension kit is built to give your Ford F-150 4WD the extra strength and lift you need without fuss. You’ll get high-strength steel leaves with a powder-coated black finish that resists rust and looks neat. The kit bolts into factory mounting points, so installation stays straightforward and you won’t need special tools. Expect firmer rear support, less sag, and better ground clearance to protect the undercarriage. With full hardware and clear instructions, you can install it yourself and regain confidence while towing, hauling, or off-roading.
- Purpose:Rear leaf spring replacement/strengthening for load support
- Mounting Style:Bolt-on to factory mounting points (complete kit)
- Adjustability:Not specifically adjustable; designed to match factory mounts
- Construction / Material:High-strength steel, powder-coated finish
- Installation Complexity:DIY installation; detailed instructions; no special tools
- Intended Use Cases:Improve rear load-bearing, towing, hauling, off-roading for Ford F-150
- Additional Feature:Fits 2009–2025 F-150
- Additional Feature:Powder-coated finish
- Additional Feature:Complete mounting hardware
Trailer Auxiliary Helper Spring Kit TSS-107-40 (2-Pack)
Should you haul heavy loads often and want a simple, strong way to stop your trailer from sagging, the Trailer Auxiliary Helper Spring Kit TSS-107-40 (2-Pack) is made for you. You get left and right helper springs that bolt on above or below your leaf spring pack. They add support, reduce sag, and limit axle hop so your trailer rides steadier and tracks better. The forged, corrosion resistant springs handle road debris and bad weather. Installation needs basic tools and a bit of confidence. You’ll feel safer towing, and the kit fixes common load problems without replacing main springs.
- Purpose:Trailer auxiliary/helper springs for supplemental support
- Mounting Style:Bolt-on to existing trailer leaf spring assembly
- Adjustability:Fixed helper spring design (placement above/below pack)
- Construction / Material:Forged premium materials, corrosion- and wear-resistant
- Installation Complexity:Basic tools required; bolt-on installation
- Intended Use Cases:Improve trailer towing stability, reduce sag/axle hop
- Additional Feature:Model-specific TSS-107-40
- Additional Feature:Left/right pair included
- Additional Feature:Forged construction
Wyckoff 500 lb Leaf Spring Helper Kit
Should you tow small trailers or haul heavy gear often, the Wyckoff 500 lb Leaf Spring Helper Kit is a smart upgrade that gives your truck or SUV more confidence on the road. You’ll notice heavy-duty powder-coated steel that resists corrosion, so it holds up in mud and salt. It adds 500 pounds of rear capacity, which helps whenever you carry tools, ATVs, or a small trailer. The kit reduces rear sag and body roll while you turn, and it bolts on with basic tools. You can tune tension with the included U-bolts for uneven loads and better control.
- Purpose:Add-on helper springs to increase rear capacity (500 lb)
- Mounting Style:Bolt-on to existing rear leaf springs (uses U-bolts)
- Adjustability:Adjustable tension via included U-bolts
- Construction / Material:Heavy-duty powder-coated steel
- Installation Complexity:Quick bolt-on; basic tools; no cutting/welding
- Intended Use Cases:Increase rear capacity for small trucks/SUVs for towing/hauling gear/ATVs
- Additional Feature:500 lb capacity
- Additional Feature:Adjustable U-bolt tension
- Additional Feature:Pre-coated components
Hellwig 550 EZ-550 Helper Spring Kit
In case you want a simple, reliable way to add light-duty load support for weekend towing or occasional hauling, the Hellwig 550 EZ-550 Helper Spring Kit fits the bill—it’s made to sit on top of your rear leaf springs and increase level capacity up to 500 pounds so your truck stays planted and controlled. You’ll like that it’s USA made from heat-treated ASTM 5160 spring steel. The bolt-on kit includes helper springs, heavy U-bolts, plated hardware, and instructions. You can adjust each side independently for uneven loads. It installs with common tools, has a powder coat finish, and stays ready whenever your tow plans change.
- Purpose:Helper springs to increase level load capacity (≈500 lb)
- Mounting Style:Bolt-on on top of rear leaf springs
- Adjustability:Adjustable via heavy-duty U-bolts (independent adjustment)
- Construction / Material:Heat-treated ASTM 5160 alloy spring steel, powder-coated
- Installation Complexity:Simple bolt-on with common hand tools
- Intended Use Cases:Light towing and load assistance for trucks
- Additional Feature:Made in USA
- Additional Feature:ASTM 5160 alloy steel
- Additional Feature:Heavy-duty U-bolts included
Rear Leaf Spring Helper for Chevy/GMC 1500 (1990-2024)
Should you haul heavy loads or tow often, this Rear Leaf Spring Helper for Chevy/GMC 1500 (1990-2024) is a smart upgrade that gives you stronger, more stable rear suspension without fuss. You’ll get 40–50% more strength, so your truck won’t sag under weight. It cuts rear squat through 2–3 inches and steadies handling on curves and rough roads. The kit installs in about an hour with common tools, and it needs no adjustments or upkeep. Note compatibility limits for 2015–2018 Magnaride and 2022 single leaf models. You’ll feel safer, confident, and ready to haul.
- Purpose:Rear helper spring to add strength and reduce squat for towing
- Mounting Style:Bolt-on complete kit (no special tools)
- Adjustability:No readjustment required after install (not adjustable)
- Construction / Material:Steel components (complete kit)
- Installation Complexity:Typical ~1 hour install; no special tools
- Intended Use Cases:Support heavy loads and towing for Chevy/GMC 1500
- Additional Feature:Wide model coverage
- Additional Feature:No maintenance required
- Additional Feature:~1 hour install time
Hellwig 987 EZ-990 Helper Spring Kit
Should you want a simple, reliable way to level your truck for light towing and everyday loads, the Hellwig 987 EZ-990 helper spring kit is a smart choice that won’t overwhelm your ride. You get a medium duty helper that sits on top of your rear leaf springs and works with the stock pack to raise level load capacity up to the vehicle rating. It’s rated to 2,000 lb, made in the USA from heat treated ASTM 5160 alloy spring steel, and comes with powder coated hardware and heavy duty U bolts. You can bolt it on with common tools and fine tune each side for uneven loads.
- Purpose:Helper spring to increase level load capacity (medium-duty)
- Mounting Style:Bolt-on on top of rear leaf springs
- Adjustability:Fully adjustable via included U-bolts (independent adjustment)
- Construction / Material:Heat-treated ASTM 5160 alloy spring steel, powder-coated
- Installation Complexity:Simple bolt-on with common hand tools
- Intended Use Cases:Light towing and loads for small trucks/SUVs
- Additional Feature:2,000 lb capacity
- Additional Feature:ASTM 5160 alloy steel
- Additional Feature:Fully adjustable U-bolts
Helper 2000 lb Heavy-Duty Leaf Spring Load Assist
In case you haul a pickup or tow a small trailer often, the Helper 2000 lb Heavy-Duty Leaf Spring Load Assist is built to keep your rear end level and confident on the road. You’ll notice it mounts atop your factory spring pack, adding up to 2,000 pounds of support so your truck won’t sag or bottom out whenever loaded. It also firm ups handling, reducing sway, bounce, and body roll for steadier braking and steering. Made from heat treated ASTM grade alloy steel with a powder coat, it bolts on with common tools, uses adjustable U bolts, and includes a one year warranty.
- Purpose:Heavy-duty load assist to add up to 2,000 lb capacity
- Mounting Style:Bolt-on on top of rear leaf springs (uses U-bolts)
- Adjustability:Fully adjustable via heavy-duty U-bolts
- Construction / Material:Heat-treated ASTM-grade alloy steel, powder-coated
- Installation Complexity:Simple bolt-on with standard hand tools
- Intended Use Cases:Medium-duty towing/hauling and preventing sag for older trucks/trailers
- Additional Feature:Up to 2,000 lb capacity
- Additional Feature:Historic vehicle coverage list
- Additional Feature:1-year warranty
500 lb Heavy Duty Trailer Helper Spring Kit
Should you haul gear regularly and need extra support without changing your truck’s ride, the 500 lb Heavy Duty Trailer Helper Spring Kit is made for you. You’ll feel more confident while loading ATVs, jet skis, or a small camper. The kit installs on top of your rear leaf springs and works with your stock spring pack, so you won’t require major mods. It evens out weight, reduces body roll and pitch, and helps you steer with better control during cornering and lane changes. Through easing stress on shocks and struts, it helps parts last longer. Support and help are available should you need them.
- Purpose:Trailer/helper spring to add up to 500 lb support
- Mounting Style:Bolt-on on top of rear leaf springs
- Adjustability:Not explicitly adjustable (bolt-on support)
- Construction / Material:Steel helper spring components (corrosion-resistant)
- Installation Complexity:Designed for easy installation atop leaf springs; customer support available
- Intended Use Cases:Midsize trucks—ATVs, jet skis, small campers, towing trailers
- Additional Feature:500 lb rating
- Additional Feature:Trailer/truck/SUV use
- Additional Feature:Customer support available
Hellwig 1801 EZ-990 Helper Spring Kit Step Bracket Style Leaf 2.5″
Should you drive a small truck or SUV and want a simple, reliable way to carry heavier loads without changing your factory springs, the Hellwig 1801 EZ-990 helper spring kit is a smart choice. You’ll like that it sits atop your rear leaf springs and increases level load capacity up to 2,000 pounds. It bolts on with common tools, uses heavy U-bolts for secure fit, and lets you adjust each side independently for uneven cargo. Made in California from heat treated ASTM 5160 alloy steel with powder coated parts, it feels durable and built to last.
- Purpose:Helper spring (step bracket style) to increase level load capacity (up to 2,000 lb)
- Mounting Style:Bolt-on (step bracket style) on top of rear leaf springs
- Adjustability:Fully adjustable using included U-bolts (independent adjustment)
- Construction / Material:Heat-treated ASTM 5160 alloy spring steel, powder-coated
- Installation Complexity:Simple bolt-on with common hand tools
- Intended Use Cases:Light towing and loads for small trucks/SUVs
- Additional Feature:Step-bracket 2.5″ style
- Additional Feature:Made in USA
- Additional Feature:Heavy-duty plated hardware
Factors to Consider When Choosing Leaf Spring Helpers
At the time you’re choosing leaf spring helpers, start matching the load capacity rating to how much weight you’ll regularly haul and tow, since that determines performance and safety. Next check vehicle compatibility and installation complexity so you know the kit will fit your suspension and you can handle or budget for the work. Also consider material and finish plus adjustability options because durable coatings and easy adjustments extend life and let you fine tune ride height and stiffness.
Load Capacity Rating
Because you want your truck to stay level and handle safely under real loads, pick a helper spring according to its rated load capacity, not vague labels. You should choose a helper spring with a rated capacity equal to or greater than the extra weight you plan to carry or tow in pounds. Match that rating to your worst-case payload, including cargo, passengers, and tongue weight for trailers, so the spring prevents sag and keeps ride height. Focus on the incremental support rating, often 200 to 2,000 plus pounds, since that number tells you how effective the spring will be. Don’t oversize too much, or the ride will become stiff and uncomfortable. Should your loads vary, pick adjustable capacity or adjustable U-bolts so you can tune support without swapping parts.
Vehicle Compatibility
Should you want helper springs that fit and work right, start matching the kit to your exact vehicle model and year range, because fitment can change between generations and suspension setups.
You’ll want to verify the kit is made for your truck, SUV, or trailer platform so mounting holes and brackets line up. Also check whether your rig uses single leaf or multi leaf packs and in case it has special OEM systems like magnetorheological or air assisted suspension, since many kits won’t work with those. Confirm drive type and axle layout, because 2WD, 4WD, single or dual rear wheels need different clearances. Make sure the kit’s mounting position matches your frame and U bolt threads. Finally, compare load capacity to your GVWR and towing needs to avoid overloading.
Installation Complexity
You picked the right helper springs for your truck, now you need to contemplate about how they’ll go on and who will do the work. Start by checking whether the kit bolts on or needs cutting and welding. Bolt-on jobs usually take 1 to 2 hours and feel friendly to a DIYer. Welded installs demand fabrication skills, a welder, and confidence.
Next, inspect U-bolt requirements. Some kits reuse factory U-bolts, but they must have at least 1/2 inch of thread left. Otherwise you’ll need longer U-bolts. Also confirm required tools. Do you require a torque wrench, spring compressors, or a hydraulic press, or will common hand tools, a jack, and stands do?
Finally, see whether alignment or adjustable hardware is needed afterward and whether instructions let two people lift and fit safely.
Material And Finish
In the event you select helper springs, the steel and finish matter more than you might envision, and they directly affect how long the parts last and how they behave under load. Pick high strength, ASTM grade alloy spring steel so your helpers resist fatigue and hold their spring rate through many trips.
However, prefer heat treated springs because they give higher yield strength and steady load capacity over time. For the finish, choose multi stage coatings like e coat plus powder coat rather than simple paint since they resist chipping and corrosion longer. Also verify coating thickness and application method so you know protection is real. Finally, use plated hardware with zinc or similar coatings to cut galvanic corrosion at joints and keep everything working together.
Adjustability Options
Whenever you need to match varying loads and keep the truck balanced, adjustability becomes one of the most useful features in a helper spring system. You can fine-tune preload with U-bolts or threaded tensioning, changing effective capacity via hundreds of pounds so the truck feels stable under different payloads. Some kits let you adjust left and right independently, which helps whenever cargo sits off-center or a trailer tongue pulls one side down. Recall that added preload often raises ride height, so check travel to avoid bottoming out or losing articulation. Consider maintenance too. Some designs need periodic re-torquing, while others are maintenance-free. Finally, compare adjustment methods, tools needed, and how easily you can tweak settings on the road.
Ride Quality Impact
After you’ve looked at adjustability, it’s time to reckon about how helper springs change the ride itself. You want added support during hauling, but you also want a comfortable daily drive. Helper springs raise spring rate at higher deflection, so they cut rear sag under load but can make an empty truck feel stiffer and send more road harshness into the cabin. Top-mounted helpers with adjustable U-bolts let you tune preload, letting you find a middle ground between support and comfort. Check rated capacity and how aggressively the helper engages, since higher-rated units usually firm up sooner. Mismatched or overly stiff helpers can shorten travel and make mid-stroke bumps worse. Well-designed helpers that match the factory pack preserve near stock comfort while preventing bottoming when loaded.
Warranty And Support
Peace of mind matters whenever you add leaf spring helpers to your truck, so you’ll want to check the warranty and support before you buy. Look at warranty length and scope, and choose lifetime, multi-year, or generous limited coverage that explicitly includes fatigue, corrosion, and manufacturing defects. Also check what voids the warranty, like off-road abuse, overloading, or aftermarket changes, and whether routine maintenance is required.
Confirm whether labor, return shipping, and replacement parts are included or provided only as parts. Ask about the claims process, needed documents such as proof of purchase and photos, and typical repair or replacement times. Prefer suppliers with dedicated support teams and transferable warranties to protect resale value and give long-term confidence.
