GM 8L45 transmission

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8L45
Overview
ManufacturerGeneral Motors
Production2016–
Body and chassis
Class8-speed longitudinal automatic transmission
Chronology
Predecessor6L45/6L50

The 8L45 is an eight-speed automatic transmission built by General Motors Company debuting in the 2016 Cadillac CT6. 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 8L90 transmission.[2] Estimated weight savings over the heavier duty 8L90 is 33 pounds. Gear ratios used enable a wide 7.0 ratio spread.

Specifications[]

Gear Teeth and Ratios 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
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
8L90

M5U

860 Nm · 635 lb·ft[3]

2014

41[4]

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

Applications[]

Model Years Make and Model Final Drive Ratio
2016–present Cadillac ATS
2016–present Cadillac CTS
2016–present Cadillac CT6
2016–present Chevrolet Camaro
2017–present Chevrolet Colorado
GMC Canyon

References[]

  1. ^ "USA Information Guide Model Year 2018" (PDF). Retrieved 15 July 2019.
  2. ^ "Cadillac Introduces New 8-Speed Automatic on CT6". Cadillac Media USA. Cadillac Media USA. Retrieved 20 March 2015.
  3. ^ "Transmission Repair Cost Guide". Retrieved 15 July 2019.
  4. ^ "WIT · Whatever It Takes · Automatic Transmission Parts Catalog 2018+2019 Page 268". Retrieved 15 July 2019.


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