The 6L90 also had more clutch plates, as an extra clutch plate was added to each clutch. The 6L90 longer transmission case also allows extra fasteners between the transmission and transfer case for decreased noise and vibration. Both actions of which strengthened the input and output gears The output gear set of the 6L90 was also wider than that of the 6L80. Thus, allowing more room to accommodate two extra pinion gears, making it a total of 6. GM used a longer transmission case, 35mm longer than the 6L80 case. While the 6L80 used four pinion gears, the 6L90 utilized six, invariably strengthening the input gear set how did GM actualize this? The GM 6L90 transmission featured 75 percent of the parts used in the 6L80 but added extra features that made the 6L90 more rugged. So in many cases, people often talk about them as though they are one. Hence, 6L80 became a contemporary to the 6L90. But unlike the usual outfacing of a former, the 6L80 was still in production. The GM 6L90 fluid capacity lurks at 13 quartz for a 30mm torque converter with the DEXRON VI as the recommended fluid.īefore General Motors phased in the 6L90, there was the 6L80 which was designed in 2005. And has a vehicle weight rating of 15,000 lbs. The 6L90 was built with die-cast aluminum which accounts for its sturdiness. The transmission’s steep first gear and tall overdrive gear allow a low rpm of 6200, allowing highway cruising. With a 500 lb-ft torque rating for passenger cars, it can withstand passenger cars outputting 555 HP with its gearbox torque of 855 lb-ft. Similarly, it has a torque rating of 520 lb-ft for diesel trucks and puts up with a diesel truck outputting 300 HP. Its maximum torque rating for gasoline trucks is 531 lb-ft, and it can withstand gasoline trucks outputting 452 HP. And also allows users to upgrade by building one with even higher torque to withstand higher engines. The 6L90 transmission features multiple torque ratings, which makes it suitable for different engines and applications. Instead of the usual planetary gear set configuration, wider gear ratios were used, allowing for better performance and fuel economy. Built-in 2007, this tranny consists of six forward gears and one reverse gear. The 6L90 transmission is a six-speed hydraulically operated automatic transmission designed for longitudinal engines and particularly for rear-wheel and rear-focused four-wheel drive vehicles. Image Credit: 6L90 Transmission Explained But first, let’s see detailed information about the 6L90. We will also highlight vehicles outfitted with the transmission. We will talk about some of the common problems of the 6L90 and possible ways to fix them. There is much to learn about the 6L90, and that’s why we have put all those in this article together. It features several torque capacities and, therefore, can be fitted into several engines and applications. It was fitted into many GM cars and trucks and has evolved tremendously. The 6L90 transmission from General Motors is commonly known for its performance and fuel-saving capabilities.
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