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. The 8L90 Hydra-Matic transmission is a fully automatic, 8-speed, rear-wheel drive, electronic-controlled transmission. The 8 speed ratios are generated using: ─ 4 planetary gear sets ─ 2 brake clutches ─ 3 rotating clutches. The three (3) rotating clutches have been located forward of the gear sets to. RAYBESTOS 8L90 Performance Transmission Rebuild Kit & Billet Input Shaft (Drop-In Clutch Module, No Added Clutch Capacity) 1/25/21: Currently on backorder - place your order now - it will be filled as soon as the part is available on a first-come, first-served basis.

The 8L90E is an 8 speed automatic transmission developed by General Motors and introduced for the 2015 Model year. It is currently phasing out the 6L80/6L90 transmissions (although it hasn’t done its all the way yet. 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. The addition of the two extra gears allows the 8L90 to realize a real world 5% fuel economy improvement over the 6L80.

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8L90E Specs

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.

Parasparam serial today episode youtube. The max power and torque specs bump up a little when it is put behind the LT1/LT4 engines. There’s more on this specific version of the transmission below. Or use this link to take you there.

8L90 Performance

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. And unlike the the Corvettes rivals at Porsche and Ferrari, the 8L90 also goes to work in pickup trucks. Thats a lot of range to engineer into one transmission.

• All models come with adaptive shift control
• Highly efficient axis binary pump
• Performance algorithm shifting
• Performs like a clutches gearbox in manual mode
• Redline shift protection
• Utilizes VFS to monitor clutch pressure for more precise shifts
• Adapts to wear and tear and compensates electronically
• Paddle shifting
• Grade control

LT1 + LT4

The 8L90E is the transmission GM chose to put behind the ultra high performance LT1 engine. There are a few minor differences between the standard version and the LT1.

• Max Torque is increased to 644 lb-ft
• Gear ratios stay the same
• LT1 uses a slip yoke design
• LT4 uses a fixed yolk design

Identifying an 8L90E

The easiest way to determine if your vehicle is equipped with an 8L90 is to utilize the RP0 codes. They can be found in the glove compartment of the vehicle in question.

8l90

You’ll want to find the code M5U. That is proof positive that the vehicle in question was at a minimum equipped with the 8L90 from the factory.

8L90E Applications

Since the 8L90 has only been available for a few model years(production started in 2014 for the 2015 model year). It is not utilized in many vehicles. It is only used in high performance vehicles and performance cars, otherwise the 8L45 is more than enough for the job.

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^[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 8L45.

The 8L90 is the subject of a class-action lawsuit filed in December 2018 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.^[2]

Specifications[edit]

8l90 M5u

Applications[edit]

8l90 Pdf

References[edit]

1. ^'USA Information Guide Model Year 2018'(PDF). Retrieved 15 July 2019.CS1 maint: discouraged parameter (link)
2. ^'Class Action Lawsuit Filed Over Alleged Shifting Defect in Certain General Motors Transmissions'. Retrieved 2 February 2019.CS1 maint: discouraged parameter (link)
3. ^'New 8-Speed Enables Quicker, More Efficient Corvette'. www.gm.com. General Motors. 20 August 2014. Archived from the original on 22 December 2014. Retrieved 21 August 2014.CS1 maint: discouraged parameter (link)
4. ^'Transmission Repair Cost Guide'. Retrieved 15 July 2019.CS1 maint: discouraged parameter (link)
5. ^'WIT · Whatever It Takes · Automatic Transmission Parts Catalog 2018+2019 Page 268'. Retrieved 15 July 2019.CS1 maint: discouraged parameter (link)
6. ^'2015 Cadillac Escalade Updated with 8L90 8-Speed Automatic and More Tech [Photo Gallery]'. Retrieved 12 August 2014.CS1 maint: discouraged parameter (link)
7. ^'Chevrolet Confirms 2015 Corvette Stingray To Utilize 8L90 Eight-Speed Gearbox'. Retrieved 9 April 2014.CS1 maint: discouraged parameter (link)
8. ^'Supercharged 2015 Chevy Corvette Z06 takes the C7 beyond the ZR1 [w/video]'. Retrieved 25 January 2014.CS1 maint: discouraged parameter (link)
9. ^'GM confirms 2015 Silverado, Sierra to get 8-speed automatic'. Retrieved 18 June 2014.CS1 maint: discouraged parameter (link)

External links[edit]

8l90 Transmission Problems