8l90 Transmission Wire Harness Diagram
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.
The 8L90 is a modern GM automatic transmission. This page will help you identify an 8L90, tell you the vehicle applications that it comes in, goes over the 8L90E technical specifications and performance. 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. Sonnax Transmission parts for GM 8L90 applications. Sonnax is an industry leader in the cutting edge design, manufacture and distribution of the highest quality products to the automotive aftermarket, commercial vehicle industries, and industrial sectors utilizing drivetrain technology. The 8L90E fits only the GEN V LT1, LT4 or LT5 engines. A numerically higher 4.56 first gear ratio offers strong take-off performance while a double-overdrive sixth gear ratio of 0.65:1 helps optimize cruising efficiency. The 8L90E from Chevrolet Performance is equipped with a slip-yoke design tail shaft.
| 8L90 | |
|---|---|
| Overview | |
| Manufacturer | General Motors |
| Production | 2014–present |
| Body and chassis | |
| Class | 8-speed longitudinalautomatic transmission |
| Chronology | |
| Predecessor | 6L80 |
| Successor | GM 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]
| Gear Teeth and Ratios[3] | Planetary Gearset: Teeth | Count | Total | Avg. | |||||
|---|---|---|---|---|---|---|---|---|---|
| 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 | |
| Gear | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | R |
| 8L90 M5U | 860 Nm · 635 lb·ft[4] 2014 | 41[5] 79 | 46 86 | 37 73 | 25 89 | 2 3 | 6.9991 | 1.3204 | |
| Ratio | 4.5600 | 2.9709 | 2.0751 | 1.6876 | 1.2700 | 1.0000 | 0.8455 | 0.6515 | - 3.8176 |
| 8L45 M5T | 2015 | 41 79 | 41 79 | 41 79 | 26 94 | 2 3 | 7.0107 | 1.3208 | |
| Ratio | 4.6154 | 3.0385 | 2.0648 | 1.6583 | 1.2587 | 1.0000 | 0.8494 | 0.6583 | - 3.9278 |
Applications[edit]
| Model years | Make and model | Final drive ratio |
|---|---|---|
| 2015–2017 | Cadillac Escalade[6] | 3.23 |
| 2015–2019 | Chevrolet Corvette (C7) Stingray [7] | 2.41 (std) |
| 2.73 (Z51) | ||
| 2015–2019 | Chevrolet Corvette (C7) Z06 [8] | 2.41 |
| 2015–present | Chevrolet Silverado/GMC Sierra[9] | 3.23 (std.) |
| 3.42 (Max Trailering Package) | ||
| 2015–2017 | GMC Yukon Denali/Denali XL | 3.23 |
| 2016–present | Cadillac ATS-V | 2.85 |
| 2016–present | Cadillac CTS-V | 2.85 |
| 2016–present | Cadillac CT6 | 3.27 |
| 2016–present | Chevrolet Camaro | 2.77 |
| 2017-present | Chevrolet Express/GMC Savana (2.8L diesel engine only) | |
| 2015-present | Chevrolet Colorado/GMC Canyon | 3.42 |
References[edit]
- ^'USA Information Guide Model Year 2018'(PDF). Retrieved 15 July 2019.CS1 maint: discouraged parameter (link)
- ^'Class Action Lawsuit Filed Over Alleged Shifting Defect in Certain General Motors Transmissions'. Retrieved 2 February 2019.CS1 maint: discouraged parameter (link)
- ^'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)
- ^'Transmission Repair Cost Guide'. Retrieved 15 July 2019.CS1 maint: discouraged parameter (link)
- ^'WIT · Whatever It Takes · Automatic Transmission Parts Catalog 2018+2019 Page 268'. Retrieved 15 July 2019.CS1 maint: discouraged parameter (link)
- ^'2015 Cadillac Escalade Updated with 8L90 8-Speed Automatic and More Tech [Photo Gallery]'. Retrieved 12 August 2014.CS1 maint: discouraged parameter (link)
- ^'Chevrolet Confirms 2015 Corvette Stingray To Utilize 8L90 Eight-Speed Gearbox'. Retrieved 9 April 2014.CS1 maint: discouraged parameter (link)
- ^'Supercharged 2015 Chevy Corvette Z06 takes the C7 beyond the ZR1 [w/video]'. Retrieved 25 January 2014.CS1 maint: discouraged parameter (link)
- ^'GM confirms 2015 Silverado, Sierra to get 8-speed automatic'. Retrieved 18 June 2014.CS1 maint: discouraged parameter (link)
External links[edit]
8l90 Transmission For Sale
