Carroll Stream Motor Company is your trusted source for genuine Tuff Torq® hydrostatic transmissions, transaxles, and OEM service parts designed for today’s most demanding lawn tractors and zero-turn mowers. Tuff Torq is the global leader in precision drivetrain technology, delivering smooth power transfer, reliable ground speed control, and long-term durability for residential and commercial mowing equipment.
We stock a growing lineup of TZT-7 and K-Series Tuff Torq products, including the TZT-7DX (787Q0824060) and TZT-7DY (787Q0824070) hydrostatic transmissions, the K46BR pre-filled transaxle (7A646084220), and OEM repair and service kits like the TZT-7R transmission kit (187Q0899510-7R) and 187Q0399250 / 187Q0399130 repair kits. Every Tuff Torq product we sell meets exact OEM tolerances for fit, performance, and durability—so you get dependable traction, smooth operation, and longer service life from your equipment.
TL-200A Series
The TL-200A is a compact hydrostatic transmission module designed for applications that use remote-mounted axles or custom drive layouts. Unlike the TZT-7 series, which integrates the axle and final drive, the TL-200A focuses on hydraulic power delivery and is commonly used in OEM mower platforms, utility equipment, and specialty vehicles.
K-Series Transaxles
The K46BR is one of Tuff Torq’s most widely used residential and light-commercial transaxles. It combines the hydrostatic transmission, differential, and axle assembly into a single sealed unit, making it ideal for lawn tractors and garden tractors.
TZT-7 Series
The TZT-7DX is engineered for commercial-grade and heavy-duty residential zero-turn mowers. It delivers strong torque under load, smooth directional control, and excellent heat management for sustained mowing. This model is commonly found on higher-end ZTR platforms where durability and responsiveness are critical.
Tuff Torq Repair & Rebuild Kits
These kits target specific wear components inside Tuff Torq hydrostatic systems, including seals, filters, and internal hydraulic parts. They are perfect for preventive maintenance or targeted repairs when a full rebuild is not required.
