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As the term "Dual Transfer Case" suggests, a second transfer case, or at least the gear reduction portion, are adapted into the drivetrain after the transmission and before the main transfer case.

Doing this allows additional gear reduction: The added gear box allows the driver to further multiply the amount of gear reduction available.

"Doubler" NP203 Reduction based systems

• The "Doubler" consists of the gear reduction portion of an NP203 Tcase coupled to the main transfer case. In the example shown the Doubler is mounted to an NP205 transfer case, allowing possible effective transfer case ratios of approximately 1:1, 2:1 and 4:1

Klune-V Extreme Underdrive systems

• While not precisely a "Dual Transfer case", it belongs on thios page. The Klune-V Extreme Underdrive was developed as the logical next step beyond the dual transfer case, and is the current ultimate multiple gearbox add-in.

Full discussion of the applications, pros and cons of such systems in the article  "A Systems Approach to 4WD Gearing"