A drivetrain configuration featuring a separate gearbox linked to the transmission output, rather than being directly attached. This assembly, when available for purchase, enables specific vehicle modifications and customizations. For instance, an older four-wheel-drive vehicle may be retrofitted to improve its off-road capabilities using such a standalone unit.
The significance of this detached component lies in its adaptability and the potential for enhanced vehicle performance. Historically, this design offered greater flexibility in driveline layout and reduced noise and vibration within the vehicle. Its availability provides options for specialized vehicle builds, allowing for custom gear ratios and improved ground clearance.