Lifting a Jeep JK to clear 37-inch tires requires a kit that balances articulation, on-road manners, and durability. We researched and compared the top options using manufacturer specifications, published lift height standards, and aggregated owner feedback from forums and verified reviews. This guide focuses on kits that provide adequate clearance for 37s without compromising safety or driveline angles. Our evaluation prioritizes real-world performance and long-term reliability over marketing claims.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Teraflex 2.5" Lift Kit with Falcon Shocks Best Overall 2.5" lift, progressive coil springs, Falcon monotube shocks |
9.0 | 🛒 Check Price |
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Metalcloak 3.5" standout Lift Kit Best for Rock Crawling 3.5" lift, dual-rate coils, 8-arm geometry correction |
8.7 | 🛒 Check Price |
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Synergy Manufacturing 3" Stage 1 Lift Kit Best Value 3" lift, progressive coils, fixed-valve shocks |
8.4 | 🛒 Check Price |
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Rancho RS66147 4" Lift Kit with RS9000XL Shocks Best Adjustable Ride 4" lift, RS9000XL 9-position adjustable shocks, coil springs |
8.1 | 🛒 Check Price |
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Rubicon Express 3.5" Super-Flex Lift Kit Best for Flex 3.5" lift, triple-rate coils, fixed-valve shocks |
7.8 | 🛒 Check Price |
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Rough Country 4" X-Series Lift Kit Budget Pick 4" lift, N3 series shocks, full hardware kit |
7.3 | 🛒 Check Price |
 |
Zone Offroad 4" Lift Kit with Fox Shocks Upgrade Pick 4" lift, Fox 2.0 shocks, full hardware |
8.2 | 🛒 Check Price |
1. Teraflex 2.5" Lift Kit with Falcon Shocks: Best Overall
In our evaluation, the Teraflex 2.5″ lift with Falcon shocks stands out as the most balanced kit for daily drivers who also hit the trails. The progressive coils provide a compliant ride while still delivering enough articulation to keep 37s planted. Based on owner feedback, the Falcon shocks significantly reduce body roll and improve high-speed stability compared to standard monotubes. The kit includes extended brake lines and bump stops, which are essential for safe operation with 37-inch tires.
That said, this kit is not the cheapest option and may be overkill for strictly mall crawlers. The adjustable shocks require periodic maintenance to keep them performing optimally. If you rarely off-road or are on a tight budget, a simpler fixed-valve kit might suffice. However, for those who want a adaptable lift that works well in varied conditions, this is our top recommendation.
- Progressive rate coils provide a smooth ride and excellent flex for 37s
- Falcon shocks feature adjustable damping for on-road comfort and off-road control
- Includes bump stop extensions and sway bar links to maintain proper geometry
Pros: Excellent ride quality on and off road; Adjustable shocks allow fine-tuning; Comprehensive kit with all necessary hardware
Cons: Higher price point compared to basic kits
2. Metalcloak 3.5" standout Lift Kit: Best for Rock Crawling
For hardcore off-roaders, the Metalcloak 3.5″ standout is a top contender. We compared its dual-rate coil design to competitors and found it offers exceptional flex, allowing 37s to stuff into the wheel wells without rubbing. The eight-adjustable-arm setup lets you fine-tune alignment, which is critical for tire wear and driveline longevity. Owner reports consistently praise its capability on technical trails, and the heavy-duty components hold up well under abuse.
The trade-off is on-road comfort. The stiff springs and bushings transmit more road noise and vibration than softer kits. Installation is also demanding, requiring welding for the track bar bracket. If your Jeep is primarily a daily driver, this kit may feel harsh. But for dedicated trail rigs, the performance gains are worth the compromises.
- Dual-rate coil springs provide progressive rate for articulation and load support
- 8 adjustable control arms correct caster and pinion angles for 37s
- Includes front and rear track bar brackets to center axles
Pros: Superior articulation for rock crawling; Durable construction with corrosion-resistant coating; Comprehensive geometry correction for large tires
Cons: Installation is complex and time-consuming; Stiffer ride on pavement for daily driving
3. Synergy Manufacturing 3" Stage 1 Lift Kit: Best Value
The Synergy Manufacturing Stage 1 kit is our value pick because it delivers reliable performance without breaking the bank. We researched owner feedback and found that the progressive coils provide a comfortable ride for daily commuting while still offering enough flex for moderate trails. The included shocks are well-valved for 37s, reducing sway and bottoming out. Installation is straightforward, making it accessible for DIY enthusiasts.
However, this kit does not include control arms, so caster and pinion angles may not be ideal for 37s without additional parts. If you plan to do serious rock crawling or need precise geometry correction, you will need to invest in adjustable arms separately. For light to moderate off-road use, this kit offers excellent value.
- Progressive rate coils offer a balance of ride quality and load capacity
- Includes bump stop extensions and sway bar links for 37s
- Shocks are valved specifically for JK weight and tire size
Pros: Great value for the features included; Good on-road manners for daily driving; Easy to install with basic tools
Cons: Shocks are non-adjustable, limiting tuning; No control arms included, may require separate purchase for optimal alignment
4. Rancho RS66147 4" Lift Kit with RS9000XL Shocks: Best Adjustable Ride
The Rancho 4″ lift kit offers a unique advantage with its 9-position adjustable RS9000XL shocks. In our comparison, this allows drivers to dial in ride firmness for different conditions, from soft for highway cruising to firm for loaded off-road trips. The kit includes all necessary components to clear 37s, including extended brake lines and bump stops. Based on owner feedback, the installation is manageable for experienced DIYers.
However, the shocks are not as durable as high-end remote reservoir units, and some users report a decrease in damping performance after prolonged rough use. The springs may also settle over time, reducing lift height. If you frequently tackle extreme terrain, you might want a more solid kit. For mixed use, the adjustability is a compelling feature.
- 9-position adjustable shocks allow tuning from soft to firm
- Coil springs are matched for 4" lift and 37s
- Includes extended brake lines and sway bar links
Pros: Adjustable shocks improve ride versatility; Affordable price for a 4" kit with shocks; Good customer support and warranty
Cons: Shocks may fade with heavy off-road use; Some owners report sagging springs over time
5. Rubicon Express 3.5" Super-Flex Lift Kit: Best for Flex
The Rubicon Express Super-Flex kit is designed for maximum articulation at a budget-friendly price. We evaluated its triple-rate coil design, which allows impressive droop and compression to keep 37s in contact with the terrain. The quick-disconnect sway bar links are a nice touch for off-road enthusiasts. Many owners report good performance on moderate trails.
However, the included shocks are basic and may not hold up to heavy use or high-speed off-roading. The springs can also be prone to sagging if the Jeep is frequently loaded with gear. For serious rock crawlers who need durability, investing in aftermarket shocks is recommended. This kit is best suited for light to moderate off-road use where flex is prioritized over long-term durability.
- Triple-rate coils provide high articulation for 37s
- Includes quick-disconnect sway bar links for off-road
- Shocks are tuned for flex but may be soft
Pros: Excellent flex for rock crawling; Affordable price point; Quick-disconnect links are handy
Cons: Shocks are not durable for heavy loads; Installation requires some mechanical skill
6. Rough Country 4" X-Series Lift Kit: Budget Pick
The Rough Country X-Series kit is the most budget-friendly option in our guide, making it accessible for JK owners who want to clear 37s without a large investment. We compared its components and found that it includes everything needed for installation, including bump stops and brake line brackets. The N3 shocks are a step up from basic hydro units, providing decent control for the price.
However, the ride quality is noticeably stiffer than more expensive kits, and the shocks can lose damping performance after repeated off-road trips. Some owners report that the springs settle, reducing lift over time. If you prioritize comfort and durability, you may want to save for a higher-end kit. For occasional off-road use and a tight budget, this kit gets the job done.
- Includes all necessary hardware for 4" lift
- N3 shocks are nitrogen-charged for improved damping
- Budget-friendly option for 37s
Pros: Very affordable for a complete 4" kit; Easy installation with clear instructions; Good customer support from Rough Country
Cons: Ride quality can be harsh on pavement; Shocks may fade quickly with off-road use
7. Zone Offroad 4" Lift Kit with Fox Shocks: Upgrade Pick
The Zone Offroad kit pairs a solid 4″ lift with Fox 2.0 shocks, which are known for their reliability and consistent damping. In our evaluation, this combination provides a comfortable on-road ride while still handling off-road terrain well. The included adjustable track bar helps center the axle, improving handling with 37s. Owner feedback highlights the shock quality as a major upgrade over budget options.
However, the price is higher than other 4″ kits, and some users report that additional adjustable control arms are needed to achieve proper caster alignment. If you are willing to invest a bit more for better shock performance and are prepared to possibly add control arms, this kit is a strong contender. It is best for those who want a lift that works well both on and off road without breaking the bank on a full long-arm system.
- Fox 2.0 shocks provide excellent damping and heat dissipation
- Includes adjustable track bar and sway bar links
- Coils are matched for 37s with progressive rate
Pros: Fox shocks offer superior performance and durability; Good geometry correction with included track bar; Smooth ride quality for daily driving
Cons: Higher price than similar kits without Fox shocks; Some owners report need for additional caster correction
Frequently Asked Questions
What lift height is needed for 37-inch tires on a JK?
For 37-inch tires on a Jeep JK, a minimum lift of 2.5 to 3 inches is typically required to avoid rubbing at full articulation. However, a 3.5 to 4 inch lift is more common to provide adequate clearance for off-road flex and to accommodate aftermarket bumpers or winches. The exact height depends on the tire width, wheel backspacing, and whether you trim the fenders.
Do I need new control arms with a lift kit for 37s?
For lifts over 2.5 inches, adjustable control arms are highly recommended to correct caster and pinion angles. Without them, you may experience driveline vibration, poor steering return, and accelerated tire wear. Many kits include control arms or brackets, but budget kits often omit them, requiring a separate purchase.
Will a 2.5 inch lift clear 37-inch tires?
Yes, a 2.5 inch lift can clear 37-inch tires with proper wheel backspacing and possibly minor fender trimming. However, articulation will be limited, and you may experience rubbing at full flex. For serious off-roading, a 3.5 to 4 inch lift is safer and provides more clearance.
What is the best suspension type for 37s on a JK?
For 37s, coil spring lifts with progressive or triple-rate springs offer the best balance of ride quality and articulation. Long-arm kits provide superior flex but are more expensive and complex. For most JK owners, a short-arm lift with adjustable control arms is sufficient for moderate off-road use.
Do I need to regear for 37-inch tires?
Regearing is highly recommended for 37-inch tires to restore power and transmission performance. Stock gearing (3.21 or 3.73) will result in sluggish acceleration and increased transmission heat. A gear ratio of 4.56 or 4.88 is typical for 37s, depending on your engine and driving needs.
Our Verdict
Our top pick is the Teraflex 2.5″ Lift Kit with Falcon Shocks for its excellent balance of on-road comfort and off-road capability with 37s. The runner-up is the Metalcloak 3.5″ standout, which offers unbeatable articulation for serious rock crawling, though it sacrifices daily drivability. Choose based on your primary use case.
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