How Does the Mahindra Thar 4×4 Work? The Complete Mechanical Breakdown

Be it navigating dense city traffic, cruising on the highway, or conquering a seemingly unconquerable trail, modern off-road SUVs are expected to be the ultimate go-anywhere companions. At the pinnacle of this segment in India sits the Mahindra Thar, an undisputed icon with a cult following.

But beneath its undeniable road presence, 226 mm of ground clearance, and solid GNCAP safety rating lies a highly sophisticated mechanical heart. To truly understand what makes this SUV unstoppable, you have to look past the rugged exterior and dive into its drivetrain.

Here is a definitive, transparent look at exactly how the Mahindra Thar’s 4×4 system works to deliver its legendary all-terrain performance.

What is the Mahindra Thar 4X4 System?

In a standard two-wheel-drive (2WD) vehicle, the engine routes power to just one axle, usually the front or rear wheels. While this is highly efficient for tarmac, it becomes a liability when traction drops.

The Mahindra Thar utilises a robust, on-demand Part-Time 4WD (Four-Wheel Drive) system. Unlike All-Wheel Drive (AWD) cars that use computers to shuffle power dynamically on the road, a part-time 4×4 system is a heavy-duty, mechanically locked setup. When engaged, it forces power to both the front and rear axles simultaneously. This ensures that even if one axle loses grip in deep slush or loose sand, the other will continue to pull the 1.7-ton SUV forward.

Because it is an "on-demand" system, drivers have the absolute freedom to keep the Thar in an efficient rear-wheel-drive mode for daily commutes, only waking up the front axle when the tarmac ends.

What Makes Up the Thar’s 4×4 System?

The current-generation Thar’s off-road superiority is the result of Mahindra’s Gen II adventure hardware working in perfect synergy. Here are the core components doing the heavy lifting:

1. The Differentials (MLD and BLD)

Differentials take rotational power from the driveshaft and distribute it to the wheels on a given axle, allowing the left and right wheels to spin at different speeds (crucial for cornering).

The Thar features heavy-duty front and rear differentials, but it takes things a step further for off-roading. On the rear axle, it employs an Eaton Mechanical Locking Differential (MLD). If one rear wheel starts slipping in the mud, the MLD mechanically locks the axle, forcing both rear wheels to turn at the exact same speed to dig out of trouble. Up front, it uses an Advanced Electronic Brake Locking Differential (BLD), which utilises the ESP suite to automatically apply brake pressure to a spinning wheel, instantly rerouting torque to the wheel with actual grip.

2. The Driveshafts

The Thar uses heavy-duty steel propshafts to connect the central transfer case to the front and rear differentials. Whether you have the 2.2L mHawk diesel or the 2.0L mStallion turbo-petrol, these driveshafts are engineered to handle massive torsional loads, up to 320 Nm of torque in the automatic variants, splitting it evenly 50:50 to the front and rear when 4×4 is engaged.

3. The Transfer Case

The absolute heart of the 4×4 system is the Transfer Case (T-case). Sitting right behind the 6-speed manual or torque-converter automatic transmission, the T-case takes the engine’s output and distributes it.

When the Thar is in 2WD mode, the transfer case sends 100% of the torque straight down the rear driveshaft. When you grab the manual shift lever and pull it into 4WD, a heavy chain and gear assembly inside the transfer case physically meshes together. This links the front and rear driveshafts, forcing them to rotate at the exact same speed.

4. Segment-First Electric Driveline Disconnect

Older 4x4s relied on manual locking hubs, meaning you had to step out of the car to manually lock the front wheels to the axle before off-roading. The modern Thar replaces this with a segment-first Electric Driveline Disconnect. When you shift back to 2WD, this system electronically disconnects the front axle driveline. This stops the front wheels from back-driving the front prop-shaft while cruising on the highway, significantly reducing mechanical drag, minimising wear, and improving real-world fuel mileage.

Understanding the Transfer Case Modes: 2H, 4H, and 4L

The Thar’s manual shift 4×4 lever, full of old-school mechanical charm, gives you three distinct operating modes to master any environment:

The 2H Mode (2WD High Range)

For 90% of your driving, 2H is the go-to mode. Power goes exclusively to the rear wheels at a standard 1:1 gear ratio. Use this for dry, hard-surfaced roads, city traffic, and highway cruising. 2H delivers the best fuel economy, the lightest steering feel, and prevents excess tyre wear.

The 4H Mode (4WD High Range)

Pull the lever into 4H, and the transfer case locks the front and rear driveshafts together, sending a 50:50 power split to all four wheels at a 1:1 speed ratio. This mode delivers maximum high-speed traction on loose, slippery, or low-grip surfaces. Because the front and rear axles are locked, you should never use 4H on dry pavement; doing so will cause "driveline wind-up," making the steering heavy and potentially damaging the internal gears.

The 4L Mode (4WD Low Range)

Pushing the lever into 4L engages a secondary reduction gear inside the transfer case. This is the Thar’s superpower. It drastically multiplies engine torque (giving the SUV an aggressive crawl ratio) while reducing wheel speed. In 4L, the vehicle will crawl forward with immense, unstoppable pulling power, allowing you to focus purely on steering inputs without needing to slip the clutch or hammer the throttle. Keep your speed strictly below 20-30 km/h in this mode to avoid over-revving the engine.

When Should You Use High Range (4H)?

4H is designed for momentum-based terrain where you need traction but want to maintain a reasonable speed. Engage 4H when driving on:

• Dirt or gravel trails
• Rain-slicked, muddy country roads
• Loose, deep beach sand (combined with slightly lowered tyre pressure)
• Snow or ice-covered roads

When Should You Use Low Range (4L)?

4L is reserved for extreme, highly technical obstacles where raw torque, slow speeds, and maximum precision are required. Engage 4L when:

• Rock crawling over large boulders
• Climbing incredibly steep, loose inclines
• Descending steep hills (utilising engine braking alongside the Thar’s Hill Descent Control)
• Wading through deep water crossings (the Thar boasts a 650 mm water-wading depth)
• Recovering another stuck vehicle

By understanding the exact mechanics of its locked differentials, reduction gears, and driveline disconnects, you can extract the maximum capability out of the Mahindra Thar, whether it's a new model or a used Thar. It isn't just about putting the car in 4x4; it's about knowing exactly how the machine beneath you is translating power to the ground.