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New 6R140 Ford TorqShift Transmission

Ford's Six-Speed For The 6.7L Power Stroke

Text By , Photography by Courtesy of Ford Motor Company

By now, you've all heard of the Ford-engineered, Ford-built, 6.7L V-8 Power troke set to debut this year. And now we've got info on Ford's new six-speed, heavy-duty TorqShift automatic transmission. Designed to handle the increased torque and horsepower offered in '11 Super Dutys, the 6R140 employs a state-of-the-art Lepelletier-style geartrain system with stronger components than its predecessor, a lower first gear ratio, double overdrive, and Ford's SelectShift technology.

Why It's Stronger
First and foremost, the 6R140 incorporates a robust, one-piece bellhousing design for utmost rigidity. For maximum efficiency, the Lepelletier geartrain reduces complexities that exist in connecting an automatic transmission's gearsets and clutches. Basically, the 6R140 uses a simple gearset to drive a Ravigneaux gearset. So the transmission uses just five clutches, and relative to one another, the speeds of the clutches are low, which increases the efficiency and durability of the entire system. The transmission is further strengthened by the utilization of a powder-metal carrier within the compound Ravigneaux planetary gearset (a double planetary system). The carrier is made up of four pressed components, which are sinter-brazed together to form a rigid, dense structure.

Why It's Better
A completely new torque converter features a long-travel, high-capacity turbine damper designed to soften the extreme torsional force produced by the 6.7L Power Stroke. In addition, the converter will lock up at lower engine speeds, which allows the engine to run at a lower rpm, thus increasing fuel economy. The torque converter also links the Live Drive power take-off (PTO) directly to the crankshaft, which allows the use of auxiliary equipment anytime the engine is running. Along with fully automatic operation, the 6R140 will also feature SelectShift automatic technology, which allows the driver to manually control the transmission via a Progressive Range Select mode. Once in full manual mode, the transmission's control system will lock the torque converter and maintain whichever gear the driver selects on the toggle switch.

Extensive Testing
According to Ford, the 6R140 has been tested for durability and reliability in its labs, as well as on the road. Physical testing consisted of running the new transmission 24 hours a day, seven days a week, until 250,000 miles were accumulated. This statement from Ford gives some insight as to what the testing regiment consisted of and how durable it will be: "The transmission was rigorously tested at unloaded and maximum gross combined weight (GCW) duty cycles for 250,000 equivalent miles to replicate what the most demanding, harshest Super Duty customer can dish out." If it's anything like the 5R110, 6.7L Power Stroke owners will have one stout powertrain on their hands.

6R140 Gear Ratios:
First - 3.97:1
Second - 2.32:1
Third - 1.52:1
Fourth - 1.15:1
Fifth - 0.86:1
Sixth - 0.67:1

SOURCES
Ford Motor Company
P.O. Box 685
Dearborn
MI  48126
800-392-3673
http://www.ford.com
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