Hydro-Gear’s entry-level commercial transaxle is designed to give you reliable and quiet performance every time you turn the key. The ZT-3100® features a high-efficiency 10cc pump and 16cc motor, 1” axle shaft, and external oil filter for fast, easy maintenance. ZT-3400® is a mid-sized commercial transmission that performs truck-like work yet delivers unmatched maneuverability in tight spaces.