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Built for Ford Super Duty workhorses (F-250, F-350, F-450), the RoadReady 6R140 is a 6-speed automatic designed for high-torque diesel applications and serious workloads. Expect smooth, controlled shifts, a wide ratio spread for confident launches and efficient highway cruising, and dependable temperature management under sustained towing and hauling.
Manufactured to OEM-equivalent standards by a Monster-Approved manufacturing partner, each unit is precision-assembled and tested for reliable power delivery and long-term durability—ideal for fleets, work trucks, and demanding daily use.
Note
In-stock transmissions usually ship the next business day.
Custom builds or out-of-stock units typically ship within 2–4 weeks.
Need it sooner? Call us — we can often make special arrangements.
We offer the most comprehensive coverage in the industry:
Extend warranties are included on all Transmission Purchases read more HERE.
No — we offer a $299 Flat-Rate One-Way Shipping to any address, commercial or residential.
If you find a better rate, you're welcome to arrange your own shipping.
Our 6R140 transmission builds are designed for durability and performance across different levels of power and use:
All units are dyno-tested and purpose-built to outperform the factory 6R140 in every category.
We include a premium billet torque converter with each 6R140 transmission, matched to your build level:
Every converter is balanced and tested for max durability and performance.
Yes — all solenoids and electronic components are replaced or fully remanufactured as part of our standard 6R140 build process.
This ensures clean shifts, stable line pressure, and full compatibility with your vehicle’s ECM and TCM.
No — fluid must be purchased separately. We offer special discounted prices and even cheaper shipping options when you bundle with our fluid at checkout.
Returning your core is simple. Once you are ready to return your core, you can initiate the return process in one of two ways:
Please Note:
Our goal is to make this process as seamless as possible — if you have questions about your core return, just give us a call.