Jeep Wrangler 2 Door On 40s

Jeep Wrangler 2 Door On 40s jeeps.truckstrend.com

The Jeep Wrangler, an undisputed icon of off-road capability, represents freedom, adventure, and a spirit of rugged exploration. While formidable in its stock form, a select breed of enthusiasts pushes its boundaries to the extreme, transforming the humble 2-door Wrangler into an unstoppable force by equipping it with massive 40-inch tires. This isn’t just a simple tire swap; it’s a monumental undertaking, a complete re-engineering of the vehicle that elevates its performance to championship levels. A "Jeep Wrangler 2 Door On 40s" signifies a highly specialized, meticulously crafted machine designed to conquer the most formidable trails and obstacles imaginable, making it the ultimate expression of off-road prowess.

This article delves deep into the world of the 2-door Jeep Wrangler running on 40-inch tires, exploring the motivations behind such an ambitious build, the critical components required, the complex build process, and the significant considerations that come with owning and operating such an extreme vehicle.

Jeep Wrangler 2 Door On 40s

Why Go 40s on a 2-Door Wrangler? The Allure and the Challenge

The decision to outfit a 2-door Wrangler with 40-inch tires is driven by a singular goal: unparalleled off-road performance.

The Benefits:

• Extreme Ground Clearance: The most obvious advantage. Larger tires dramatically increase the distance between the vehicle’s undercarriage and the ground, allowing it to clear massive rocks, logs, and deep ruts without damage.
• Superior Traction: With a larger contact patch and aggressive tread patterns, 40-inch tires provide immense grip on loose surfaces, slick rocks, and steep inclines.
• Improved Approach, Departure, and Breakover Angles: The increased height helps prevent scraping bumpers and the underside of the vehicle when navigating severe terrain.
• Enhanced Stability: A wider stance (often a byproduct of the necessary wheel offsets) can contribute to better stability on uneven terrain, though the higher center of gravity needs to be managed.



• Iconic Visuals: There’s no denying the imposing, aggressive aesthetic of a 2-door Wrangler on 40s. It’s a statement of extreme capability.
• Rock Crawling Prowess: For dedicated rock crawlers, 40-inch tires are often the gold standard, providing the necessary height and traction to climb over seemingly impossible obstacles.

The Challenges:
However, this level of modification comes with significant challenges and compromises:

• Cost: This is not a cheap endeavor. The necessary upgrades far exceed the cost of the tires themselves.
• Complexity: It requires extensive mechanical knowledge, specialized tools, and often professional fabrication.
• Driveline Strain: Stock components cannot withstand the leverage and stress exerted by 40-inch tires. Everything from axles to steering and brakes needs substantial upgrades.
• On-Road Manners: Handling, braking, and fuel economy are significantly compromised, making it less practical for daily driving.



• Legality: Many regions have laws restricting vehicle height and tire protrusion, which can make a 40-inch build illegal for street use.

Key Components for a 40-Inch Build: Beyond the Basics

Building a 2-door Wrangler to reliably run 40-inch tires requires a complete overhaul of its core systems. Skimping on any of these components is a recipe for catastrophic failure.

1. Suspension System: The Foundation of Lift

• Lift Height: Typically, a minimum of 5-6 inches of lift is required, often more depending on fender modifications.
• Long-Arm vs. Short-Arm: Long-arm kits are almost mandatory for 40s. They relocate control arm mounting points further from the axle, providing better suspension geometry, articulation, and ride quality at extreme lift heights compared to short-arm kits.
• Coil-Overs or Custom Coils: High-quality, progressive rate coil springs or even custom coil-over shocks are essential for managing the weight and forces involved, offering superior damping and adjustability.

2. Axles: The Unsung Heroes

This is arguably the most critical and expensive upgrade. Stock Jeep axles (even Rubicon Dana 44s) are not strong enough for 40-inch tires under heavy off-road use.

• Upgraded Axles: The standard choice is a set of full-float, heavy-duty aftermarket axles like Dynatrac ProRock 60s or Currie RockJocks, or even custom 1-ton truck axles. These feature larger ring and pinion gears, stronger axle shafts, and beefier housings.
• Gearing: To compensate for the larger tire diameter and restore power, significant re-gearing is necessary. Common ratios include 5.13, 5.38, or even 5.89, depending on the transmission and engine.
• Lockers: Air lockers (ARB), electronic lockers (Eaton E-Locker), or mechanical lockers are essential for maximizing traction on extreme terrain.

3. Steering System: Control and Durability

The stock steering system will quickly fail under the stress of 40-inch tires.

• Heavy-Duty Components: Upgraded tie rods, drag links, and track bars made from chromoly or solid steel are non-negotiable.
• Hydro Assist Steering: A hydraulic assist system (or full hydraulic steering) is highly recommended, if not mandatory. It uses a hydraulic ram to aid in turning the massive tires, reducing strain on the steering box and driver.
• Upgraded Steering Box/Pump: A stronger steering box and pump are often part of a complete hydro-assist system.

4. Driveshafts: Power Transfer Under Flex

• Upgraded CV-Style Driveshafts: The increased lift angle requires new, longer driveshafts with constant velocity (CV) joints to prevent binding and vibrations, especially when the suspension is articulating.

5. Fenders and Tire Clearance: Making Room

• Flat Fenders/High-Clearance Fenders: Stock fenders will not clear 40-inch tires, especially during suspension compression and turning. Flat fenders, high-clearance fenders, or even fender trimming are necessary to prevent rubbing.
• Inner Fender Liners: Custom inner fender liners may be required for complete protection and clean aesthetics.

6. Tires and Wheels: The Stars of the Show

• 40-Inch Tires: Choose aggressive mud-terrain (M/T) or dedicated rock-crawling tires known for their durability and traction.
• Beadlock Wheels: Highly recommended for extreme off-roading. Beadlock wheels mechanically clamp the tire bead to the wheel, allowing you to run extremely low tire pressures (single digits) for maximum traction without the tire separating from the rim.
• Proper Backspacing: Wheels with appropriate backspacing are crucial to ensure tire clearance with suspension components and to achieve a wider, more stable stance.

7. Brakes: Stopping the Beast

• Big Brake Kit: Larger tires significantly increase rotational mass and leverage, making stock brakes inadequate. An upgraded big brake kit with larger rotors, calipers, and pads is essential for safe stopping power.

8. Body Armor and Protection: Shielding Your Investment

• Rock Sliders: Protect the rocker panels from impacts.
• Skid Plates: Protect vital components like the oil pan, transmission, transfer case, and fuel tank from trail damage.
• Bumpers: Heavy-duty steel bumpers provide protection and often incorporate winch mounts and recovery points.

The Build Process: A Journey of Transformation

Transforming a stock 2-door Wrangler into a 40-inch monster is a significant undertaking, not a weekend project.

1. Planning and Budgeting: This is the most crucial step. Research components thoroughly, prioritize needs, and create a realistic budget that accounts for parts, labor, and unexpected issues. Expect costs to easily exceed the vehicle’s purchase price.
2. Component Acquisition: Order all necessary parts. Lead times for specialized axles or custom fabrication can be extensive.
3. Professional Installation vs. DIY: While some enthusiasts tackle parts of the build themselves, complex modifications like axle swaps, suspension geometry correction, and hydro assist are best left to experienced off-road shops with the right tools and expertise. Incorrect installation can lead to dangerous failures.
4. Fabrication: Expect some level of custom fabrication for fender clearance, shock mounts, or other unique requirements.
5. Testing and Tuning: Once assembled, the Jeep needs thorough testing, both on and off-road, to identify any rubbing, binding, or handling issues. Suspension tuning (shock valving, spring rates) is an ongoing process to optimize performance.
6. Ongoing Maintenance: A highly modified vehicle requires more frequent and meticulous maintenance. Regular inspections for wear and tear on driveline components, steering, and suspension are vital.

Driving Dynamics and Considerations

On-Road Performance

A 2-door Wrangler on 40s is primarily built for off-road dominance, and its on-road manners reflect that.

• Compromised Handling: The higher center of gravity, larger tires, and often softer suspension will result in more body roll, slower steering response, and a less precise feel.
• Reduced Fuel Economy: Expect significantly worse MPG due to increased weight, rolling resistance, and aerodynamic drag.
• Braking Distance: Even with upgraded brakes, the increased mass and rotational inertia mean longer stopping distances.
• Noise and Vibration: More aggressive tires and beefier driveline components can lead to increased road noise and vibrations.

Off-Road Performance

This is where the 2-door on 40s truly shines.

• Unmatched Capability: It can tackle obstacles that would stop most other vehicles in their tracks. Rock crawling, deep mud, and steep climbs become achievable.
• Articulation: A well-tuned long-arm suspension allows for incredible wheel travel, keeping tires on the ground for maximum traction.
• Approach to Obstacles: The sheer size of the tires allows for a more aggressive approach to obstacles, often simply driving over them rather than around.

Legality and Insurance

• Local Laws: Lift laws, tire protrusion laws, and fender coverage requirements vary widely by state and even county. Research local regulations thoroughly. Some builds may be strictly for off-road use or require special registration.
• Insurance: Inform your insurance company of major modifications. Some may refuse to cover certain changes, or premiums may increase significantly.

Maintenance and Longevity

Running 40-inch tires puts immense stress on every component of the vehicle.

• Increased Wear: Expect accelerated wear on wheel bearings, ball joints, steering components, and driveline parts.
• Regular Inspections: Frequent visual inspections of all critical components are a must before and after every off-road trip. Look for loose bolts, bent parts, or leaks.
• Fluid Changes: Driveline fluids (differential, transfer case, transmission) may need more frequent changes.
• Tire Care: Regular rotation and balancing are crucial to maximize tire life, though 40-inch tires are notoriously difficult to balance perfectly.

Practical Advice and Actionable Insights

1. Budget Realistically: Add at least 20-30% to your initial budget for unexpected costs.
2. Prioritize Strength: Do not cut corners on axles, steering, or suspension components. These are the critical links that prevent catastrophic failure.
3. Research Thoroughly: Join online forums, talk to experienced builders, and visit reputable off-road shops. Learn from others’ successes and failures.
4. Understand the Compromises: A 40-inch build is a dedicated off-road machine. Be prepared for a less comfortable, less fuel-efficient, and potentially less street-legal vehicle.
5. Seek Professional Help: Unless you have extensive mechanical experience, a fully equipped shop, and a deep understanding of vehicle dynamics, entrust major modifications to professionals.
6. Drive Responsibly: Even with a highly capable rig, understand its limits and your own driving skills. Start with easier trails and gradually work up to more challenging terrain.

Estimated Price Table: Jeep Wrangler 2 Door On 40s Build

Building a 2-door Jeep Wrangler on 40s is a substantial financial commitment. The prices below are estimates and can vary wildly based on brand, quality, labor rates, and specific vehicle model (JK/JL).

Component Category	Estimated Price Range (USD)	Notes
Base Vehicle (Used)	$20,000 – $45,000+	Depends on year, mileage, trim (Rubicon often preferred for strength).
40-inch Tires (Set of 5)	$2,000 – $3,500+	Aggressive M/T or dedicated rock crawling tires.
Beadlock Wheels (Set of 5)	$2,000 – $4,000+	Essential for low-pressure off-roading.
Heavy-Duty Axles (Front & Rear)	$10,000 – $25,000+	Aftermarket Dana 60s (e.g., Dynatrac, Currie) with lockers & gearing.
Long-Arm Lift Kit (6"+)	$3,000 – $10,000+	High-quality kits with control arms, springs, shocks, etc.
Hydro Assist Steering	$1,500 – $3,000+	Includes pump, ram, hoses, reservoir.
Heavy-Duty Driveshafts	$1,000 – $2,500+	Front and rear, CV-style.
Big Brake Kit	$1,000 – $3,000+	Larger rotors, calipers, pads.
Flat/High-Clearance Fenders	$500 – $1,500+	Steel or aluminum options.
Body Armor (Sliders, Skids)	$1,000 – $3,000+	Steel rock sliders, skid plates for critical components.
Heavy-Duty Bumpers	$1,000 – $3,000+	Front (with winch mount) and rear.
Winch & Recovery Gear	$500 – $2,000+	Essential for self-recovery.
Miscellaneous (Control arm drops, adjustable track bars, extended brake lines, etc.)	$1,000 – $3,000+	Many small but necessary components.
Professional Labor (Installation)	$5,000 – $15,000+	Varies greatly by shop rates and complexity of the build.
TOTAL ESTIMATED BUILD COST (Excluding Base Vehicle)	$30,500 – $79,500+	This is a significant investment.
GRAND TOTAL (Including Used Base Vehicle)	$50,500 – $124,500+	A true high-end build can easily exceed $100,000.

Frequently Asked Questions (FAQ)

Q1: Is a Jeep Wrangler 2 Door On 40s street legal?
A1: It depends heavily on your local laws regarding vehicle height, tire protrusion, and fender coverage. In many areas, such a highly modified vehicle may not be street legal without special permits or may only be allowed for off-road use. Always check your state and local regulations.

Q2: How much does it cost to put 40s on a 2-door Wrangler?
A2: As detailed in the price table above, the cost for the modifications alone can range from $30,000 to $80,000+, not including the base vehicle. A complete high-end build can easily exceed $100,000.

Q3: Can I install 40-inch tires on my stock Wrangler?
A3: Absolutely not. Running 40-inch tires on a stock Wrangler would lead to immediate and catastrophic failure of axles, steering, and suspension components, besides not having sufficient clearance. Extensive modifications are mandatory.

Q4: Will putting 40s on my Jeep void my warranty?
A4: Yes, major modifications like these will almost certainly void most, if not all, of your factory warranty.

Q5: What’s the best base model for a 40-inch build?
A5: While any 2-door Wrangler can be modified, the Rubicon models (JK Rubicon or JL Rubicon) offer a slightly stronger starting point with Dana 44 axles (still needing significant upgrades for 40s), lower transfer case gearing, and factory lockers. However, the fundamental axle and driveline upgrades are still necessary regardless of the trim.

Q6: How does fuel economy change with 40-inch tires?
A6: Expect a significant drop in fuel economy. The increased weight, rolling resistance, and aerodynamic drag will drastically reduce your MPG, often to single digits, especially if proper re-gearing isn’t done, or even if it is.

Q7: How much lift do I need for 40s on a 2-door Wrangler?
A7: Typically, 5-6 inches of lift is a minimum, combined with high-clearance fenders or significant fender trimming. Some builds might go higher, depending on the desired articulation and specific component choices.

Conclusion

The Jeep Wrangler 2 Door On 40s is more than just a vehicle; it’s a testament to engineering ambition and a passion for extreme off-roading. It represents the pinnacle of capability, allowing its owner to tackle trails that are simply impassable for lesser machines. However, this level of performance comes at a substantial cost, demanding a significant financial investment, meticulous planning, and a deep understanding of the compromises involved in transforming a street-legal vehicle into an off-road titan.

For those who commit to the journey, the reward is an unparalleled off-road experience – a machine that laughs in the face of daunting terrain and redefines what’s possible. It’s not for the faint of heart or the shallow of wallet, but for the dedicated few, a 2-door Wrangler on 40s is the ultimate expression of the unyielding spirit of adventure.