April 20, — GM 8L90 and 8L45 transmission problems have caused a proposed class action lawsuit that alleges the 8-speed transmissions are defective in the following vehicles in California, Illinois, Michigan, New Jersey, New York and Texas. According to the plaintiffs, GM 8L90 and 8L45 transmission problems have plagued their vehicles because dealerships have been unable to remedy.
The automatic transmissions allegedly act up when drivers attempt to accelerate or decelerate. Said shudder, shake and hesitation also occurs while the subject vehicles are accelerating in a single gear, and not actively shifting gears.
The plaintiffs say 8L90 and 8L45 transmissions can violently shift to the point drivers believe they were hit by other vehicles. The transmission problems allegedly occur within the transmissions or torque converters that cause friction on the surfaces and failures of the gears and hydraulic systems. This allegedly causes metal shavings to circulate through the 8L90 and 8L45 transmissions, damaging the torque converters and transmissions.
According to the lawsuit, owners and lessees are stuck with repeated repairs that include flushing the transmissions of metal shavings, but in the end the vehicles still suffer multiple problems. The plaintiffs say they can't depend on their vehicles, something that if they would have known likely would have caused them to purchase different vehicles.
General Motors has allegedly known about the 8L90 and 8L45 transmission problems since when the automaker started issuing technical service bulletins TSBs and other bulletins to dealerships.
The bulletins are meant to assist dealers if customers complain about issues with the transmissions by making repairs such as these:. According to the plaintiffs, none of the repairs have truly fixed the transmission problems and the automaker continues to conceal the alleged defects from customers.
Documents from the lawsuit reference numerous preliminary information PI and technical service bulletins sent to dealers beginning in October up to October The bulletins were sent because of problems with the 8-speed transmissions that shudder, jerk, lurch and have delayed responses, specifically GM 8L45 and 8L90 transmissions.
These conditions may be caused by an internal torque converter issue. A revised torque converter that addresses these conditions will be available soon. Customers should be advised that the transmission makes use of an adaptive function that will help to refine the shift feel while driving and improve shift quality. According to the lawsuit, General Motors issued more than 12 additional bulletins related to 8-speed transmission problems.
In addition, instead of sending dealers multiple bulletins, the plaintiffs say the automaker should have warned consumers about vehicles equipped with faulty transmissions. General Motors, LLC. Lawsuit alleges 8-speed transmissions jerk, shudder, shake and violenty shift.
TSB Guide How these simple documents can unlock information about your car. Read Our Guide.We know, advertisements are annoying and slow down the internet. Unfortunately, this is how we pay the bills and our authors.
We would love for you to enjoy our content, we've worked hard on providing it. Please whitelist our site in your adblocker, refresh the page, and enjoy! The Hydra-Matic 8L45 production code M5N is a fuel-saving and electronically controlled eight-speed automatic transmission developed and produced by General Motors for use in rear- and rear-biased all-wheel-drive vehicles with a longitudinal powertrain orientation. With a wide 7. However, we should note that 8L45 M5U, the more capable variant of the 8L45, has a torque capacity of pound-feet Nm.
In addition, the 8L45 is estimated to be roughly 33 pounds lighter than the 8L Along with design features that reduce friction, the 8L45 is expected to contribute up to 5-percent greater efficiency, when compared with a six-speed automatic. Five clutches are used, three at a time, leaving only two open clutches in each gear state. Optimized clutch sizing and off axis binary pump contribute to outstanding spinloss attributes.
All applications feature adaptive shift controls. Several features such as grade braking, Performance Algorithm Shifting, and Driver Shift Control are available on some of the applications. Performance Algorithm Shifting PAS monitors how assertively the driver is using engine output and other vehicle sensors to determine at what engine speed to upshift of downshift.
Driver Shift Control allows the driver to shift the transmission like a clutchless manual gearbox.
Electronic safeguards prevent over-revving if the wrong gear position is selected. The 8L45 uses VFS control components to monitor clutch pressures with optimum accuracy. The result are faster and more precise shifts. The torque converter is mm in diameter and features a lock-up clutch, although clutch and converter specifications vary depending on the application. The 8L45 uses electronic controlled capacity clutch ECCC technology, which employs a small, regulated amount of slip to dampen out engine pulses for a smoother running drivetrain, especially during shifting.
The 8L45 uses Dex 6 HP Transmission fluid, which was developed to have a more consistent viscosity profile as well as improved lubrication characteristics. Low Maintenance The 8L45 uses Dex 6 HP Transmission fluid, which was developed to have a more consistent viscosity profile as well as improved lubrication characteristics.
Clutch-to-clutch architecture, with external transmission control module Maximum engine power: unknown hp unknown kW Maximum engine torque: unknown lb-ft unknown Nm Maximum gearbox torque: unknown lb-ft unknown Nm Gear Ratios First: 4. GM Authority Newsletter Subscribe for free to receive our daily newsletter in your inbox.
First Name. Last Name. Clutch-to-clutch architecture, with external transmission control module.We know, advertisements are annoying and slow down the internet. Unfortunately, this is how we pay the bills and our authors. We would love for you to enjoy our content, we've worked hard on providing it. Please whitelist our site in your adblocker, refresh the page, and enjoy! In fact, we cover a class action lawsuit brought against GM back in April, complaints from ownersand even a recommendation that GM replace the eight-speed altogether with a new unit as quickly as possible.
As of July 8 th, GM began using a new type of Mobil 1 automatic transmission fluid for the troublesome transmissions. Customers that complain of shuddering and harsh shifting characteristics in the 8-speed GM transmissions are recommended for a trans fluid flush.
As of August 7 thGM dealers should also be flushing all potentially affected new vehicles on the lot. The GM 8L45 eight-speed automatic transmission. The issues with the 8-speed GM transmission are two-fold. First, some customers report the transmission shuddering frequently. Secondly, the shifts are very harsh between first to second, and then second down to first, especially when accelerating and the transmission is upshifting or decelerating and the transmission is downshifting.
These conditions are most commonly observed under light and medium throttle applications, and as often during full throttle applications. However, a new fluid flush appears to fix the issues, with some customers beginning to report a dramatic change in shift quality after swapping out the old juice.
Driving the vehicle for about a week or so improves shift quality even further as the new fluid cleans things up inside the transmission and the adaptive shift algorithms relearn various parameters. Hopefully the new fluid swap will provide a lasting fix.
GM 8L90 transmission
Have you experienced shuddering and harsh shifts with your eight-speed GM transmission? Have you gone in for a fluid-swap fix? Jonathan is an automotive journalist based out of Southern California. He loves anything and everything on four wheels. We'll send you one email per day with the latest GM updates. The newest fluid seems to have corrected the issues with the shudder almost immediately.
However the fluid only temporarily fixed my 8 speed sierra. I have a shudder worse than before after about miles. I am in my second visit from 36k to 47k.The 8L90 is an eight-speed automatic transmission built by General Motors Company. It is designed for use in longitudinal engine applications either attached to the front-located engine  with a standard bell housing or in the rear of the car adjacent to the differential as in the Corvette. It is a hydraulic hydramatic design.
GM also produces a similar design with the smaller 8L The 8L90 is the subject of a class-action lawsuit filed in December that alleges the transmission suffers from persistent "shudder" issues and that GM has known about the problems since its introduction and has failed to provide a solution, instead choosing to wait until the unit is out of warranty.
From Wikipedia, the free encyclopedia. Retrieved 15 July Retrieved 2 February General Motors. Archived from the original on 22 December Retrieved 21 August Retrieved 12 August Retrieved 9 April Retrieved 25 January Retrieved 18 June Part of the Automobile series. Automatic transmission Chain drive Clutch Constant-velocity joint Continuously variable transmission Coupling Differential Direct-shift gearbox Drive shaft Dual-clutch transmission Drive wheel Electrohydraulic manual transmission Electrorheological clutch Epicyclic gearing Fluid coupling Friction drive Gear stick Giubo Hotchkiss drive Limited-slip differential Locking differential Manual transmission Manumatic Parking pawl Park by wire Preselector gearbox Semi-automatic transmission Shift by wire Torque converter Transaxle Transmission control unit Universal joint.
Electric motor Hybrid vehicle drivetrain Electric generator Alternator. Portal Category. Categories : Automatic transmission tradenames General Motors transmissions Automotive part stubs. Hidden categories: All stub articles. Namespaces Article Talk. Views Read Edit View history.Francis, et al v.
General Motors, LLCa class action recently filed in the United States District Court for the Eastern District of Michigan, alleges that the automotive giant was aware that thousands of vehicles manufactured between and contained defective transmissions, but did nothing to warn customers.
Overall, the complaint alleges separate charges relating to vehicles sold in 32 different states from California to New York. The vehicles include:. What is worse, over time, damage to the transmission and torque converter occurs. Thus, consumers face escalating repairs that can include flushing the transmission of metal shavings caused by the defective transmission operation, and which eventually necessitates the replacement of components such as the torque converter, valve body, or the entire transmission.
In fact, sinceGM has issued no less than thirteen versions of technical service bulletins or TSBs relating to these transmission issues. Fortunately, the experienced lemon law attorneys at CCA are well-versed in the technical and legal nuances of pursuing legal action against GM. Skip to content. By Brian T. Murray, Esq. Website developed in accordance with Web Content Accessibility Guidelines 2.
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TSB Seems To Fix 8-Speed Automatic GM Transmission Problems
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GM 8-Speed 8L45 M5N Hydra-Matic Automatic Transmission
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