The ratios are 2.48, 1.48, and 1.00. Reverse is 2.08. This is the same as the HD automatic transmission in GM trucks. The ratios are the same as the TH400 except for a 0.75 overdrive. Max input torque is 440 lbs-ft.
Transmission fluid goes through a cooler integrated with the engine oil cooler.
From the cooler, the fluid goes though an intercooler inside the transfer case, and then back to the transmission. The input shaft and rear output shaft are co-linear. The front is a left handed output, chain driven. In H, the normal operating position, torque is evenly split front and rear via the transfer case's differential. This center differential is open and allows the front and rear driveshafts to turn at different rates to allow turning on high traction surfaces.