2009 Model Year Hydra-Matic 4L60 (M30) / 4L65 (M32) / 4L70 (M70) Car and Truck Transmissions
Hydra-Matic 4L60 / 4L65 / 4L70 four-speed automatic rear- and four-wheel-drive transmission
The HUMMER H3 Truck will be introduced with the 3.7L LLR, and 5.3L LH8 engines.
Both of these engines will be combined with the M30 rear wheel drive 4L60.
The LLR will utilize a 258mm torque converter while the LH8 will be combined with the 300mm converter.
The major focus of activities for the 2009 MY will be cost and quality improvements.
FULL DESCRIPTIONS OF NEW OR CHANGED FEATURES
The Hydra-Matic 4L60 / 4L65 are differentiated primarily because of gearset design.
Each of the two planetary gearsets in these four-speed automatic transmissions have four pinion gears in the 4L60, and five pinion gears in the 4L65 and 4L70
The 4L65 was introduced in the 2001 model year as a heavy duty (HD) variant with more robust parts that provide increased strength.
Beginning in 2002, many of the technologies from the 4L65 applications that add durability have been incorporated into the 4L60, such as more robust bushings and bearings.
is a variation of the five-pinion 4L65, with additional strengthening in the output shaft and reaction internal gear to handle increased engine torque.
The Hydra-Matic 4L60 / 4L65 / 4L70
are also characterized by rigid structures and low noise designs.
These transmissions are state of the art for rear-drive and four-wheel-drive cars and trucks because of their adaptive shift electronic controls and GM’s proprietary Electronic Controlled Capacity Clutch (ECCC) technology.
The ECCC allows sophisticated variable clutch slip to dampen engine pulses, providing smooth shifting and driveline feel.
The transmissions also take directions from vehicle powertrain control modules to avoid hunting between gears when climbing hills.
All domestic applications utilize , the stand-alone T42 transmission control module, which allows sophisticated software control of the transmission.
An extremely versatile transmission, the 4L60 / 4L65 / 4L70
functions in a wide range of applications.
Its sophisticated electronic controls and high-torque capabilities allow it to serve in pickups and SUVs ranging from the compact Chevrolet Canyon and GMC Colorado pickup trucks to the roomy GMC Yukon XL.
Because of a new input speed sensor added for the 2006 Model Year, the 4L60 is able to be tuned to match the brand character of the new mid-size rugged
A new transmission fluid, DEXRONฎ-VI,
was developed for the 2006 Model Year to behave more consistently during temperature and other environmental variations, as well as to provide even lubrication of the moving surfaces of the transmission.
This fluid is validated in all 4L60/4L65/4L70 transmissions.
The 4L60 / 4L65 / 4L70
are produced in two plants, Toledo, OH and Ramos Arizpe, Mexico.
The Ramos Arizpe plant has state-of-the-art gear processing systems, and similar systems have now been upgraded at the Toledo plant, which has been building transmissions since 1982.
As part of a corporate-wide reduction of environmentally hazardous materials, the use of lead in aluminum, bushings, and bearings will in essence be eliminated, and the 4L series will comply with both GM and EU requirements.
FOUR-WHEEL DRIVE OPTIONS
The 4L60 / 4L65 / 4L70
transmission is mated to several different transfer cases used by four- and all-wheel-drive applications.
The Colorado and Canyon pickups use the Isuzu model T150 part-time two-speed transfer case with electric engagement of driving ranges.
The Trailblazer and Envoy use the NP model 226, which features an electrically operated clutch pack that functions as a center differential for full-time use on any surface.
The Trailblazer SS uses an NV 120 with a unique Torsen center differential.
This is an automatic torque-sensing center differential that detects slippage mechanically and sends torque to the non-slipping axle.
The Chevrolet Silverado ( Classic ) and GMC Sierra ( Classic ) pickups use the NP models 246, 261 and 263.
The NP246 has an electrically operated clutch pack to send torque to the front axle while the NP263 has a 2 speed part time electric range selection.
The NP261 is a conventional manual part-time transfer case.
The ( Classic ) pickup series bows in late 2007 replaced by the New for 2007, Silverado and Sierra series trucks.
New Magna transfer cases debut replacing each of the current NP products; MP1625 and 1626 2 speed electric, MP3023 and 3024 2 speed active and MP1222 and 1225 2 speed manual selection.
The new Magna line brings improved powertrain control integration and band width for torque input.
Borg Warner continues with the BW 4493 and 4494 2 speed AWD unit in the GMT345, an updated BW4484 2 speed AWD for increased band width in the H2 and the BW4481 is used in the premium full-size SUVs.