To build a dual transfer case, two reductions boxes are bolted back to back with a dual case adapter. These two are then bolted to a 4wd section. The TrailCreeper is ready to bolt onto the front of a top shift style, gear driven Toyota transfer case. Available with 21 or 23 spline input and output gears. Units are completely rebuilt and inspected. Low range gear ratio is 2.28. Floorboard and drive shaft modifications are required for dual transfer case installation. No core charge. One year warranty.