2026 6R140 OEM Upgraded Replacement Transmission – Warren Diesel Shop The 6R140 OEM Upgraded Replacement is a dependable enhanced rebuild of the Ford TorqShift 6R140 automatic transmission for 2011-2019 Ford Super Duty trucks with the 6.7L Powerstroke diesel. Designed for stock, tuned, or deleted trucks in daily driving and towing, it fixes common stock failures—like overdrive clutch burnout and 3-4 shift flare that can occur as early as 70,000 miles—through targeted upgrades for lasting reliability. 9-Pack vs. Stock 7-Pack Overdrive Clutch in Ford 6R140 The stock 6R140 overdrive clutch pack (also called the E-clutch or 4-5-6 pack) uses 7 friction clutches. This is the factory standard for 2011-2019 Super Duty trucks and often fails prematurely—even on stock trucks—due to insufficient holding power, leading to 3-4 shift flare, slipping, heat buildup, and burnout under towing or mild tuning. The upgraded 9-pack overdrive adds two extra high-energy clutches by modifying the piston while keeping the thickest steels possible (.068″). This increases surface area and torque capacity by ~28%, dramatically improving heat dissipation, eliminating flares, and supporting tuned/deleted trucks with greater reliability. In Warren Diesel’s 6R140 rebuilds, the machined intermediate housing (also called the intermediate clutch housing or piston housing) is precision-cut to accommodate extra clutches (e.g., upgrading to a 6-pack intermediate from OEM 4). This modification increases clearance for additional friction plates without compromising structural integrity. Key benefits include: Greater torque holding capacity in the intermediate clutch pack (used in 2nd and 6th gears) Reduced slipping and heat buildup under load Better resistance to unwanted side-load stresses from the heavy rotating center assembly (planetary gears, drums, and shafts) Minimized deflection, wear on bushings/bearings, and premature failure in tuned/towing applications
