In which year did General Motors use the second-generation 6AT transmission?

[StEdward]

In 2006, the first batch of General Motors' self-developed 6-speed automatic transmissions was introduced, with internal codes 6T70 and 6T75. The second-generation products were launched in 2009, with codes 6T40, 6T45, and 6T30. Below is relevant information: Definition: A transmission is a gearbox that changes the transmission ratio and direction of motion. It is located between the clutch and the central drive. Its main functions are: changing the driving force and speed of the vehicle (shifting) without altering the engine's speed and torque; enabling the vehicle to move backward (reversing); and allowing the engine to idle without stalling (neutral gear). Classification: Based on the transmission type, gear transmissions can be divided into three categories: two-shaft, three-shaft, and composite types. The two-shaft type has two main shafts (excluding the reverse shaft) and only requires one pair of gears for deceleration. The three-shaft type has three main shafts (input shaft, intermediate shaft, and output shaft) and requires two pairs of gears for deceleration.

[VanEli]

While researching automotive materials, I found that General Motors' second-generation 6AT transmission was widely adopted starting around 2013. The first-generation 6AT models, such as the 6T40 and 6T45, had numerous issues in actual use, including jerky shifting and poor reliability, which caused headaches for many owners. To address these problems, GM introduced the second-generation versions around 2013, such as the 6T70 and 6T75, which featured upgrades to the control module and internal hydraulic circuit design, resulting in smoother shifts and significantly lower failure rates. For example, post-2014 Chevrolet Malibus and Buick Regals commonly came equipped with this new transmission. I think this update was particularly timely, helping consumers avoid repair hassles and overall improving driving comfort. If you're in the market for a used car, you might want to prioritize models from around 2014.

[StJosephine]

Speaking of the launch year of the second-generation GM 6AT, I recall it was widely implemented around 2013-2014. My old car was a first-generation Chevrolet, and I always felt the transmission was jerky. Later, when I changed cars, I deliberately chose a 2014 Buick, and indeed, the upgraded transmission was much smoother. The second generation mainly improved the control logic and cooling system, addressing the common jerking and overheating issues of the first generation. This had a significant impact on daily driving, saving the hassle of frequent visits to the repair shop. In 2014, many popular GM models like the Chevrolet Cruze were updated with the new version. From a car owner's perspective, I think paying attention to this year change is very practical, as it helps people avoid risks when choosing a car.

[LaHector]

General Motors introduced the second-generation 6AT transmission around 2013 as a major improvement over the first generation. Early versions in the late 2000s revealed reliability issues such as rough shifting and fluid leaks, sparking owner complaints. With the second-generation launch, models like the 6T70 enhanced materials and software controls, significantly boosting performance. This change stemmed from competitive pressures as Japanese automakers were also upgrading transmissions. GM consolidated its market position through this update, with 2014 models benefiting notably.

[McEvangeline]

I understand that the second generation of GM's 6AT transmission was introduced around 2013. The first generation often had issues with jerking, which were resolved in the second generation through optimizations in design, such as oil circuits and electronic modules. Starting in 2014, it was widely used in models from brands like Chevrolet and Buick, significantly reducing the repair rate. For car owners, this upgrade means a smoother driving experience and lower maintenance costs. It's recommended to pay attention to the year difference during maintenance, as vehicles after 2014 usually come with the new version, which is more reliable.