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First gear: 4.0:1.
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Second gear: 2.2:1.
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Third gear: 1.4:1.
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Fourth gear: 1.0:1.
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Crawler gear: 6.0:1.
These are illustrative numbers, not specifications for the vehicle shown in the photograph.
In a 4.0:1 first gear, the transmission input shaft rotates approximately four times for every one rotation of the output shaft, ignoring losses and other drivetrain components.
In a 6.0:1 crawler gear, the input shaft rotates approximately six times for every output-shaft rotation.
This means the output turns more slowly while receiving greater torque multiplication.
The actual torque delivered to the wheels also depends on the final-drive ratio, transfer case, drivetrain efficiency, and other mechanical components.
The result is a vehicle that can move very slowly while maintaining the pulling force necessary to overcome resistance.
This is particularly useful when precision matters more than speed.
For example, a vehicle crossing large rocks needs to move slowly enough for the driver to select a safe path.
A truck maneuvering a heavy trailer may need controlled movement without repeatedly slipping the clutch.
A vehicle climbing a steep trail needs sufficient torque to maintain progress.
In all these situations, an extra-low gear can make a significant difference.
4. What Is the Difference Between G and First Gear?
Many drivers assume that first gear is already designed for maximum pulling power.
That is generally true within the range of ordinary forward gears.
However, a crawler gear may have an even lower ratio.
The difference becomes especially important when a vehicle operates under heavy loads.
Consider two situations.
Situation A: Normal city driving
A passenger car stops at a traffic light.
The driver selects first gear, gradually releases the clutch, and accelerates.
The vehicle moves away smoothly.
First gear provides sufficient torque for this ordinary situation.
Situation B: Difficult off-road driving
A heavy vehicle must climb a steep, uneven trail covered with loose stones.
The driver needs the vehicle to move at a very low speed without constantly increasing engine speed or slipping the clutch.
An extra-low gear can provide more controlled movement.
The vehicle may travel only a few kilometers per hour while maintaining substantial torque at the wheels.
This is why crawler gears are especially useful in vehicles designed for demanding work.
They are not intended to make a vehicle faster.
Their purpose is almost the opposite: to make very slow movement possible without sacrificing the pulling ability required by the situation.
5. Why the Gear Pattern in the Photograph Looks Different
The photograph shows an unusual manual gear pattern:
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R.
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G.
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Unlike modern six-speed manual gearboxes, the arrangement includes a letter instead of another numbered forward gear.
This can look unfamiliar to drivers who have only operated contemporary passenger cars.
Traditional manual gearboxes often use an H-shaped shift pattern.
The driver moves the gear lever sideways into a selected gate and then forward or backward to engage a particular gear.
The exact arrangement varies by manufacturer and transmission design.
In the pictured pattern, G occupies a separate position within the shift layout.
On a vehicle using the German Gelände designation, that position may represent the additional low-speed gear.
The important thing is not to assume that every vehicle with a similar-looking pattern uses precisely the same mechanism.
Some gearboxes have specialized forward gears, while others incorporate separate reduction stages or transfer-case systems.
The vehicle's manual is the correct source for identifying the position and its operating restrictions.
6. Why Low Gears Are So Important for Off-Road Driving
Off-road driving requires more than engine power.
A vehicle must be able to distribute that power in a controlled way while dealing with unpredictable surfaces.
Road conditions can change dramatically within a few meters.
One section may be dry and firm.
The next may contain mud, loose gravel, sand, or large rocks.
A vehicle traveling too quickly may lose traction or strike an obstacle with excessive force.
This is where low gearing becomes useful.
Climbing steep hills
When climbing a steep slope, gravity increases the resistance the engine must overcome.
A low gear helps multiply torque at the wheels.
It also allows the vehicle to climb at a controlled speed.
Crossing rocky terrain
Large rocks can lift individual wheels or cause the vehicle to move unevenly.
A crawler gear allows the driver to move slowly and carefully while maintaining control.
Driving through mud
Mud creates additional rolling resistance.
The vehicle may need substantial torque to maintain movement.
Low gearing can help, although tire selection, traction, and driving technique are equally important.
Moving through deep sand
Soft sand increases resistance and can cause wheels to sink.
A suitable gear helps maintain momentum and controlled power delivery.
The correct approach depends on the vehicle, terrain, and tire conditions.