Here you can see a complete Marlin Crawler T-case stack. To the right is a standard Toyota T-case, fed by a Marlin adapter assembly (middle), preceded by an added Toyota reduction box on the left. The reduction box is the forward half of a stock gear model T-case and houses a 2.28:1 reduction gear set. Using a stock donor reduction yields a T-case with 2.28:1 or 5.2:1 low-range gearing. With the installation of aftermarket 4.7:1 low-range gears, the result is a low-low-range of about 11:1.