Gm 8l90

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Gm 8l90

It is designed for use in longitudinal engine applications attached to the front-located engine [1] with a standard bell housing. It is a hydraulic hydramatic design sharing much with the 8L 90 transmission. Gear ratios used enable a wide 7. The 8L 90 is an eight-speed automatic transmission built by General Motors. It is designed for use in longitudinal engine applications either attached to the front-located engine [1] 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 8L 90 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. Contents move to sidebar hide. Article Talk.

Cadillac Media USA, gm 8l90. Another lost benefit when operating with an OEM oil pan is the lack of structural support to the case.

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Eight-speed automatic transmissions have been around since , but General Motors was a little late to the party, due to development, manufacturing and other concerns. A year later, the 8L transmission series had spread out to the Corvette and trucks such as the Silverado and Yukon. Currently, GM offers two models of eight-speed transmissions, the light-duty 8L45 and heavy-duty 8L The 8L90 also has a ZF thumbprint on it, though somewhat less than the previous six speeds. The 8L90 uses numbers to describe when a friction element is applied like GM six speeds, but the numbering is somewhat more involved with the eight speeds due to more gears. Friction elements are listed accordingly:. Although there are four planetary gear sets, GM did a great job in compressing the space needed overall. From the connecting shell in the front to the removable splined output shaft in the back, the nested planet assembly is certainly compact Figure 1. Four of the five clutch hubs are also part of the assembly.

Gm 8l90

The 8L90E is an 8 speed automatic transmission developed by General Motors and introduced for the Model year. Structurally, the 8L90 is similar to the 8L45 , except that it is made to handle more power and torque. It is an incredibly advanced transmission and has the technology to perform at a high level in the Corvette, while at the same time being cost effective enough to use in high volume production. The addition of two extra gears over the previous generation 6L80 was necessary to meet ever tightening Federal fuel economy laws. Like most GM automatic transmissions that have come before it, the 8L90E has an aluminum case, overdrive, and can handle a lot of power. Through a combination of lightweight materials and wizardry, GM engineers were able to get the 8L90 to weigh in a couple of pounds less than the 6L80E, and keep it roughly the same size. Or use this link to take you there. The 8L90 has four different gears sets and five clutches. This allows for extremely tight shifts in a relatively small space. The 8L90 offers a true manual paddle shifting experience.

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Retrieved 12 August As leading experts in the 8L90 transmission community, we are proud to bring you an installment on this unit in our popular Drivetrain series. GM dropped the ball on the software that controls those transmissions and no tweaking of the calibratables, available in the editor or not, will sufficiently fix the shift quality. The 8L 90 is an eight-speed automatic transmission built by General Motors. Express [d]. My tranny is a 8L Because gm told them not to replace the toque converter to fix the problem. Additionally, this transmission comes at a time when Mopar now Stellantis engaged in a corporate relationship with ZF allowing them to use their generally durable 8HP series transmissions. Thanks for the info, I know there is probably a lot of people who could care less, but I love inside info like this and im always searching for knowledge like this. Thanks smokeshow, I figured bad programming was the case. Problem 6 - The High Pressure Oil Pump Featuring a new design to General Motors, the 8L90 transmission uses a chain driven oil pump system where the central pump gear is driven by the speed of the motor, and the high pressure oil pump itself is in the pan area pulling oil from the pan to be distributed through the valve system. We have systematically identified these valves, installed billet aluminum sleeves, and upgraded valves that negate the potential for future valve bore wear while also guaranteeing fast and efficient valve travel at all times. I guess its the same reasons why we see unnatural curves with random discontinuities in the stock maps as well.

A judge has granted class action certification to a lawsuit involving 39 plaintiffs across 26 states that accuses General Motors of knowingly selling cars with faulty transmissions. On Monday, David Lawson, U. District judge for the Eastern District of Michigan, granted class certification in the case of Speerly v.

At Next Gen, all built 8L90 transmissions feature some form of upgraded C2 clutch system. Due to the obvious nature of this upgrade, it is standard on ALL Next Gen Drivetrain 8L90 transmissions to contain a cast aluminum deep pan. This ensures that its day one performance is maintained throughout the lifespan of the product. Just getting started on it A lot of people won't agree with this, but if the issues are in fact in the software, we don't have the necessary parameters in HP Tuners to properly fix these issues. Retrieved 21 August The OEM input shaft is quite functional, there are no improvements to be made in terms of modifying how it operates. Jerry the 8 speed transmission uses a special fluid for the transmission. It's caused by some air in the clutch after pressure drains down over night. There have been so many tcm updates, the updated fluids, and faulty trans temp harnesses, but at the end of the day they just have a lot of quirks. GM dropped the ball on the software that controls those transmissions and no tweaking of the calibratables, available in the editor or not, will sufficiently fix the shift quality. Because of this, many transmission facilities simply won't touch them. There are other contributors to this problem that we will address later in this publication.