A specific type of transfer case, identified by a specific numeric code, is configured in a manner where it is not directly attached to the transmission. Instead, it is mounted separately, often to the vehicle’s frame, and connected to the transmission output via a driveshaft. This configuration allows for greater flexibility in drivetrain layout and is typically found in older four-wheel-drive vehicles.
This design offers advantages in terms of adaptability to different vehicle lengths and chassis configurations. Historically, it was a common solution when mating transmissions to axles with significant distance between them. The independent mounting can also simplify servicing and modification. However, it introduces an additional driveshaft and associated u-joints, which can increase complexity and potentially decrease overall drivetrain efficiency.