4x4 is a system that provides power to all four of the vehicle’s drive wheels. Some systems are engaged electronically or manually by the driver, while others are permanently active. Individual systems have specific requirements and/or restrictions for vehicle speed and activation parameters.
Pros
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- Works in adverse terrain conditions
- Permanently mounted – always ready to use
- Activated from the cab
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Cons
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- Expensive
- Heavy
- Decreased fuel efficiency
- Factory option – cannot be retrofitted
- Requires differential lock for full effect
- Does not increase braking power
- Increased turning radius
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4x4 can be fitted to:
Commercial Trucks
Tractor Trailer
Ambulance
Fire and Rescue
School and Transit Buses
Yard Tractor
Snow and Ice Removal
Utility Trucks
Compare with other systems
| Type of vehicle | Onspot | Conventional tire chains | Sand spreaders | Textile tire socks | 4x4 |
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| Commercial Trucks |  |
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| Tractor Trailer | |
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| Ambulances | |
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| Fire and Rescue | |
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| School Busses and Coaches | |
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| Yard Tractors | |
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| Snow and Ice Removal | |
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| Utility Trucks | |
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Maintenance
4x4 systems are maintenance free.