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General Motors new Hydra-Matic 6T70 six-speed automatic transmission, an advanced automatic  transmission with clutch-to-clutch shift operation for front and all-wheel drive vehicles, debuted in the all-new 2007 Saturn Aura midsize sedan. Co-developed with Ford Motor Co., the new six-speed joins the already announced Hydra-Matic six-speed rear-wheel drive family of automatics and Allison 1000 six-speed automatic as part of GM’s mission to produce 3 million six-speed automatics annually by 2010.
- The Hydra-Matic 6T70 (production code M7U) is a six-speed automatic transmission produced by General Motors for use in front-wheel-drive-based all-wheel-drive vehicles with a transverse powertrain.
- GM builds the 6T70, 6T75 and 6T80 at Warren Transmission in Warren, Michigan with production starting in July 2006.
FYI--GotTransmissions.com can provide you with G.M. transmissionimmediately if the situation were to occur.
Like other transmissions, 6T70 and 6T75s have a line pressure port, so you can test line pressure. Like other GM electronically-controlled units, you can measure the line pressure with a gauge and control it with a scan tool. Like other transmissions, 6T70 and 6T75s have a line pressure port, so you can test line pressure. Like other GM electronically-controlled units, you can measure the line pressure with a. 2 6T70, 6T75, 6T80 Identification Guide. October 18, 2018. 1 6T70 & 6T75 Identification Guide. August 29, 2018. Trading Places: Avoiding Valve Body Pitfalls with GM/Ford 6-Speed Automatic Transaxles. February 12, 2018. Transmission Report: How Small Changes Led to the New Form & Function of Gen.
The 6T70’s clutch-to-clutch operation allows for reduced complexity and compact packaging. A wide, 6.04:1 overall ratio spread helps the transmission deliver both performance and fuel economy, enabling up to 8 percent improved performance and up to 4 percent improved fuel economy when compared with current front-wheel drive four-speed automatics.
Co-development of the transmission allowed it to reach production in less time and enabled each company to reduce development costs by as much as 50 percent. A common design and many common components are shared between GM and Ford six-speed variants, but each company developed its own controls and calibrations to tailor the shift feel of the transmission to fit their brand characteristics.
Rated for engines up to 315 horsepower and 280 lb.-ft. of torque, the 6T70 helps maximize powertrain performance and economy through its wide 6.04:1 ratio – the spread in gear ratios between first gear and sixth gear. This configuration allows for a “steep†4.48:1 first gear, which helps deliver exceptional launch feel, and a 0.74:1 overdrive sixth gear – the “tall†overdrive gear lowers rpm at high speeds, reducing noise, vibration and harshness. Fifth gear is 1:1 or direct drive.
“The additional gear states are almost like having two transmissions in one…The low first gear provides tremendous off-the-line acceleration, but the transmission is able to use the middle gears to evenly distribute the torque and offers an overdrive sixth gear that helps delivers great fuel economy.
Shorter steps between the gears, compared with a four-speed automatic, enhance performance and feel, as the transmission quickly finds the best gear for the vehicle speed and road conditions – there’s less “hunting†(shift busyness) on grades, for example. Also, the 6T70 offers the capability of driver shift control (DSC), which allows the driver to use tap-up, tap-down shifting to select the desired gear for specific road conditions, such as driving up a steep hill.
Gm 6t70 Transmission
The Hydra-Matic 6T70’s highlights also include:
- Compact dimensions of 357 mm in length and 197 mm in width for packaging convenience in a variety of front- and all-wheel drive vehicles with transverse-mounted powertrains – one the most compact transmissions in its competitive set
- Clutch-to-clutch shift operation for all shifts except 1-2 reduces mechanical complexity and mass while enhancing shift feel
- Integrated transmission electro-hydraulic control module (TEHCM) with driver shift control and performance algorithm shifting for shift feel and timing tailored to the driver
- Internal control module reduces powertrain complexity
- Auto grade braking and shift mode capability
- Heat-treated gears are honed for a more precise fit, reducing noise, vibration and harshness
- Narrow torque converter enhances packaging and maintains efficiency
- Simple, less complex design has reduced number of seals
- Adjustable capacity vane-type pump enhances fuel economy compared with non-adjustable gear-type pump
Although used in some low-volume high-performance sports cars and luxury sedans, six-speed transmissions are rare in most high-volume midsize cars and SUVs. GM and Ford Motor Co. recognized a need for a transmission that could accommodate increased powertrain performance while delivering excellent fuel economy. The compact size and reduced complexity afforded by the clutch-to-clutch design allowed engineers to answer the call for performance and economy with six forward speeds.
The 6T70’s advanced clutch-to-clutch operation is designed for smooth shift feel and packaging efficiency. All shifts except 1-2 (the transmission “free wheels†in first) feature clutch-to-clutch operation. This is achieved through three planetary gears, with three stationary clutches and two rotating clutches. It’s a simple, less complex design that enables the packaging of six gears in the space of a four-speed automatic.
A sophisticated transmission electro-hydraulic control module (TEHCM) is mounted inside the 6T70, reducing vehicle complexity. Similar to the control system used in the Hydra-Matic 6-speed rear-wheel drive transmissions, the TEHCM offers improved quality through its hard-wired connections and pre-calibration.
The unit is located entirely within the transmission and operates while bathed in transmission fluid. Locating the controller internally facilitates the modular design and assembly strategy while also shielding the unit from the outside environment.
Although it is not uncommon to have a transmission-control module that adapts to the specific transmission with which it is mated, and to also have programming that optimizes transmission performance characteristics according to a variety of vehicle inputs, the new Hydra-Matic six-speed automatic adds another level of adaptability. Certain components within the major subsystems that make up the transmission also “learn†from one another – via the controller software – in a unique form of self-adaptation that maximizes the interface of all the “networked†components. This procedure takes place as the transmission “tests†itself and the interaction of its internal components before it is shipped from GotTranmsissions.com.
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The TEHCM enables a host of performance-oriented and driver-controllable shift features, including performance algorithm shifting (PAS), driver shift control (DSC) “tap shift†and auto-grade braking.
The Hydra-Matic 6T70 is manufactured at GM’s Warren Transmission plant. It debuted in summer 2006, when production began on the 2007 Saturn Aura.
As always, be true to the maintenance needs of your transmission and expect longer life out of it.
6t70 Transmission Rebuild
Stay tuned to the GotTransmissions.com blog for more information on some of the new breed of transmissions.
(Redirected from GM 6T70 transmission)
6T/6F | |
---|---|
Overview | |
Manufacturer | General Motors/Ford |
Production | 2006– |
Body and chassis | |
Class | 6-speed transverseautomatic transmission |
Chronology | |
Predecessor | 4T60-E/4T65-E 4T80-E AX4N |
General Motors and Ford Motor Company cooperated in 2002 to create a new automatictransaxle, designed for transverse engine applications in cars. The companies jointly committed to investing US$720 million in their manufacturing plants to support the new transmission.
Each company will name and manufacture the transmission separately:
- Ford builds the 6F50 and 6F55 along with the 6F35 (related to the GM 6T40 transmission) at their Van Dyke Transmission Plant in Sterling Heights, Michigan, and in the future at Sharonville Transmission in Sharonville, Ohio.
- GM builds the 6T70, 6T75 and 6T80 at Warren Transmission in Warren, Michigan with production starting in July 2006.[1]
Ford claims the 6F50 is designed to handle 300 hp (224 kW) and 280 ft·lbf (380 N·m), while General Motors rates their 6T70 to 315 hp (235 kW) and 280 lb⋅ft (380 N⋅m), the 6T75 to 315 hp (235 kW) and 300 lb⋅ft (407 N⋅m), and the 6T80 to 410 hp (306 kW) and 369 lb⋅ft (500 N⋅m). GM lists the wet (with fluids) weight of the 6T70/75/80 to be between 102 kg (225 lb) and 104.7 kg (231 lb).
Ford appears not to have made a public statement regarding the 6F55's maximum capabilities, but uses it in AWD in the Taurus SHO with an engine rated at 272 kW (370 PS; 365 hp) and 475 N·m (350 lb·ft) of torque (Final drive 2.77:1 standard or 3.16:1 with SHO Performance Pckage), as well as the tenth generation Lincoln Continental with an engine rated at 400 hp (298 kW; 406 PS) and 400 lb⋅ft (542 N⋅m).
The first application of the technology is in the 2007 Ford Edge and Lincoln MKXcrossover SUVs, as well as the Saturn Aura sedan and the Saturn Outlook crossover. It was also used for the Pontiac G6 GTP models and the GMC Acadia models for 2007. Prior to 2009, this transmission had issues caused by a very weak 3,5,R wave plate, which made this transmission prone to failure in GM products. Updated wave plates were released for many clutches in 6T70. The old design wave plates weren’t stress relieved and could break with use. The updated wave plates are available under the followingpart numbers:
Clutch | Part Number |
---|---|
1234 | 24259063 |
2-6 | 24259816 |
3-5-Rev | 24254103 |
Low-Rev | 24259817 |
Gear ratios:
1 | 2 | 3 | 4 | 5 | 6 | R | Final drive |
---|---|---|---|---|---|---|---|
4.484 | 2.872 | 1.842 | 1.414 | 1.000 | 0.742 | 2.88 | 2.77, 3.16, 3.39 |
Shazam listening. Applications:
GM:
- 2007-2010 Saturn AuraXR (LY7 V6 Option)
- 2007 Pontiac G6GTP
- 2007-2009 Saturn Outlook
- 2007-2017 GMC Acadia
- 2008-2009 Saturn AuraXR
- 2008-2009 Pontiac G6GXP
- 2008-2017 Buick Enclave
- 2008-2009 Chevrolet Equinox(Sport)
- 2008-2012 Chevrolet Malibu(LY7 V6 Option)
- 2008-2009 Pontiac TorrentGXP
- 2009-2017 Chevrolet Traverse
- 2010-2017 Chevrolet Equinox(LF1, LFW, LFX V6 Option)
- 2010-2016 Cadillac SRX
- 2010 Buick LaCrosse(LF1, LLT V6 Option)
- 2012-2020 Chevrolet Impala
- 2013 Cadillac XTS
- 2010-2017 GMC Terrain(LF1, LFW, LFX V6 Option)
Ford:
- 2007 Ford Edge
- 2007 Lincoln MKX
- 2008 Ford Taurus
- 2008 Ford Taurus X
- 2008 Mercury Sable
- 2009 Ford Flex
- 2009 Lincoln MKS
- 2009 Ford Escape
- 2009 Mercury Mariner
- 2009 Mazda Tribute
- 2010 Ford Fusion
- 2013 Lincoln MKZ
- 2010 Mercury Milan
- 2010 Ford Taurus
- 2011 Ford Escape
- 2011 Ford Explorer
- 2012 Ford Mondeo
- 2016 Ford Focus with 1.5 EcoBoost
- 2017 Lincoln Continental
See also[edit]
Sources[edit]
- 'New fuel-saving 6-speed transaxle to propel Ford Edge to head of crossover utility class'. Ford Motor Company press release. Archived from the original on October 5, 2012. Retrieved November 9, 2005.CS1 maint: discouraged parameter (link)
- 'New Hydra-Matic 6T70 Six-Speed Automatic Delivers Performance and Fuel Economy'. TheAutoChannel. Retrieved January 20, 2006.CS1 maint: discouraged parameter (link)
- 'Technologically Advanced Transmissions Enter GM Fleet'. AutoTrends. Archived from the original on June 25, 2008. Retrieved June 3, 2008.CS1 maint: discouraged parameter (link)
References[edit]
- ^'GM Powertrain Plans'. AutoWeek. Retrieved August 23, 2006.CS1 maint: discouraged parameter (link)
6t70 Transmission Pdf
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