8l90

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  1. 8l90 Gear Ratios
  2. 8l90 Tsb
  3. 8l90
  4. 8l90 Transmission For Sale

SuperMatic™ 8L90-E Eight-Speed Transmission Chevrolet Performance has adapted the production-based 8L90-E eight-speed automatic transmission for use with the LT1 and LT4 crate engines. A numerically high 4.56 first gear ratio offers strong take-off performance while a wide 7.0:1 overall ratio helps enhance cruising efficiency.

  • Torque Converters, SRL-3 Series Billet Triple Clutch, 1.702 in. Crank Pilot Diameter, 36-spline, 9.500 in. Diameter, 8L90, Each. Part Number: FTI-SRL90082-3 Not Yet Reviewed.
  • The 8L90 has proven to be a very capable transmission right from the factory, however as many have pressed for more power and faster times weaknesses have been exposed in many transmissions. With proper tuning, a factory 8L90 can survive up to around 800-900whp. However advanced wear is typically noticed in power levels above 700-800whp.
  • GM 258mm HP Series 8L90 Torque Converter $1,320.00 HP Series Billet Stator Torque Converter Converter Diameter - 258mm This is a modified factory converter with billet stator. This will increase the stall speed approximately 1000 rpm over stock, to around 3000-3200 rpm.
  • Used in numerous GM car and light truck applications, the 8L90 transmission and its little brother the 8L45 are a challenge even for the most experienced dealership or repair shops. The 8L90 can be identified by the following RPO codes, M5Q, M5X and new for 2019, MQE while the 8L45 is identified by the RPO codes, M5T, M5N.

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.

Navigation

8L90 Gear Ratios

1ST4.56
2ND2.97
3RD2.08
4TH1.69
5TH1.27
6TH1.00
7TH0.85
8TH0.65
Reverse3.82

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.

8l908l90

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 Specifications

RPO CodeM5U
ManufacturerGM
Production Years2015+
Number of Gears8 forward
Maximum RPM7000
Max Torque635 lb-ft
Max Horespower650
Max Transmission Torque738 lb-ft
Length
Case2 Piece Aluminum
Computer Control?Yes, External TCM
Weight210+ Pounds
Max Shift Speed RPM7000
Max GVW13,200
Max GCVW20,500
Tourqe converter258mm, locking
ATFDexron High Perormance

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.

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.

Make and ModelModel YearsFinal Drive RatioNotes
Cadillac Escalade [2]2015–20173.23
2015–present
2.41Standard
2.73 (Z51)Z51
Chevrolet Corvette (C7) Z06 [4]2015-current2.41
2015–present
3.23Standard
3.42Towing Pacage
GMC Yukon Denali/Denali XL2015–20173.23
Cadillac ATS-V2016–present2.85
Cadillac CTS-V2016–present2.85
Cadillac CT62016–present3.27
Chevrolet Camaro2016–present2.77
Chevrolet Colorado/GMC Canyon[6]2017–present3.42
8L90
Overview
ManufacturerGeneral Motors
Production2014–present
Body and chassis
Class8-speed longitudinalautomatic transmission
Chronology
Predecessor6L80
SuccessorGM 10L90

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

8l90 Gear Ratios

Gear Teeth and Ratios[3]Planetary Gearset: TeethCountTotalAvg.
Model

Type

Version

First Delivery

Sun 1

Ring 1

Sun 2

Ring 2

Sun 3

Ring 3

Sun 4

Ring 4

Brakes

Clutches

Ratio

Span

Gear

Step

Gear12345678R
8L90

M5U

860 Nm · 635 lb·ft[4]

2014

41[5]

79

46

86

37

73

25

89

2

3

6.99911.3204
Ratio4.56002.97092.07511.68761.27001.00000.84550.6515- 3.8176
8L45

M5T

201541

79

41

79

41

79

26

94

2

3

7.01071.3208
Ratio4.61543.03852.06481.65831.25871.00000.84940.6583- 3.9278

Applications[edit]

8l90 Tsb

Model yearsMake and modelFinal drive ratio
2015–2017Cadillac Escalade[6]3.23
2015–2019Chevrolet Corvette (C7) Stingray [7]2.41 (std)
2.73 (Z51)
2015–2019Chevrolet Corvette (C7) Z06 [8]2.41
2015–presentChevrolet Silverado/GMC Sierra[9]3.23 (std.)
3.42 (Max Trailering Package)
2015–2017GMC Yukon Denali/Denali XL3.23
2016–presentCadillac ATS-V2.85
2016–presentCadillac CTS-V2.85
2016–presentCadillac CT63.27
2016–presentChevrolet Camaro2.77
2017-presentChevrolet Express/GMC Savana (2.8L diesel engine only)
2015-presentChevrolet Colorado/GMC Canyon3.42

8l90

8l90

8l90 Transmission For Sale

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]


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