6R140 Full Transmissions

Heavy-Duty 6R140 Full Transmissions & Built Performance Replacement Units

When the factory automatic gearbox in your hard-working Ford truck fails, or when you are building a high-horsepower street machine that completely overpowers the stock drivetrain, a standard factory rebuild is rarely enough. The 6R140 TorqShift six-speed is a massive transmission, but under the stress of high-output electronic tuning, larger fuel injectors, or continuous heavy-haul cycles, internal components like the friction plates, forward drums, and valve bodies face immense strain. Upgrading to a built, complete 6R140 full transmission replaces your tired or slipping gearbox with a fully engineered, heavy-duty powertrain solution designed to handle massive low-end torque without missing a beat.

Our specialized inventory features premium, fully assembled performance 6R140 transmissions built by industry-leading drivetrain experts. These complete replacement units are fully re-engineered from the oil pan to the output shaft. They feature upgraded multi-plate friction clutches with increased surface area, reinforced input, intermediate, and output shafts fabricated from high-strength alloys, and custom-calibrated valve bodies that provide crisper, positive gear engagement. Every full transmission we supply comes integrated with a heavy-duty, multi-disc billet torque converter, ensuring that the critical mechanical link between your engine and your wheels is completely bulletproof right out of the box.

Investing in a complete, built 6R140 transmission assembly delivers absolute peace of mind for hot shot drivers, dedicated fifth-wheel haulers, and diesel enthusiasts alike. These transmissions are dyno-tested under simulated load conditions prior to shipping to guarantee flawless hydraulic pressures, precise shift timing, and leak-free performance. To ensure the ultimate setup and maximize the lifespan of your new gearbox, we highly recommend installing a high-capacity aluminum deep transmission pan and thoroughly flushing or replacing your auxiliary transmission coolers during installation. Browse our selection of premium 6R140 full transmissions, and trust the technical team at Full Force Diesel to deliver the heavy-duty driveline infrastructure your truck requires.