GM 6L50 transmission

The 6L50 (and similar 6L45) is a 6-speed longitudinally-mounted automatic transmission produced by General Motors. It is very similar in design to the larger 6L80/6L90, and is produced at GM Powertrain plants in Toledo, Ohio; Silao, Guanajuato, Mexico; and by the independent Punch Powerglide company in Strasbourg, France. This transmission features clutch to clutch shifting, eliminating the bands used on older transmission designs. The 6L50 debuted for the 2007 model year on the V8-powered versions of the Cadillac STS sedan and Cadillac SRX crossover, and replaces the 5L40-E and 5L50 in GM's lineup. The 6L45 version is used in certain BMW vehicles and the Cadillac ATS, as part of either rear-wheel drive and all-wheel drive powertrains.

6L45 · 6L50
Overview
ManufacturerGeneral Motors
Production2006–
Body and chassis
Class6-Speed Longitudinal Automatic Transmission
RelatedGM 6L80 Transmission
Chronology
Predecessor4L60-E · 4L65-E
5L40-E · 5L50
Successor8L45 Transmission

The 6L50 is adaptable to rear-wheel drive and all-wheel drive applications. The 6L45 can accommodate engines with up to 332 ft·lbf (450 N·m) of torque and vehicles with a GVWR up to 5,000 lb (2,268 kg).

Specifications

Technical Data
Gear Teeth

and Ratios

 Planetary Gearset: Teeth

Lepelletier Gear Mechanism

 Count Total Avg.
Ravigneaux Simple
Type Sun 1.1

Ring 1.1

 Sun 1.2

Ring 1.2

 Sun 2

Ring 2

 Brakes

Clutches

 Ratio

Span

 Gear

Step

Gear 1 2 3 4 5 6 R
6L50 37

47

 47

97

 49

89

 2

3

 6.0346 1.4326
Ratio 4.0650 2.3712 1.5506 1.1567 0.8532 0.6736 - 3.2001
6L80 35

46

 46

92

 50

94

 2

3

 6.0401 1.4329
Ratio 4.0267 2.3635 1.5319 1.1522 0.8521 0.6667 - 3.0638
ZF

6HP ALL

 31

38

 38

85

 37

71

 2

3

 6.0354 1.4327
Ratio 4.1708 2.3397 1.5211 1.1428 0.8672 0.6911 - 3.4025

Applications

6L 45
  • 2007–2010 : BMW X3 - 3.0si / 2.5si / 3.0i
  • 2007– ... : BMW 3 series - 330(x)i / 328(x)i / 325(x)i / 323i / 320i / 318i / 316i
  • 2007– ... : BMW 1 series - 130i / 128i / 125i / 120i / 118i / 116i
  • 2009– ... : BMW X1 (E84) - 2.8i xDrive / 2.5i xDrive / 1.8i sDrive
  • 2013–2015 : Cadillac ATS[1]
  • 2010–2013 : Cadillac SLS

6L50

See also
  • List of GM transmissions
  • "GM Launches More Fuel-Saving Six-Speed Automatic Transmissions". GM Media Online. Retrieved June 18, 2006.

References
  1. Csere, Csaba (March 2012). "Dissected: 2013 Cadillac ATS". Car and Driver. Hearst Communications, Inc. OCLC 38224673. Archived from the original on 2012-11-21. Retrieved 2012-11-21.
  2. "2015 Chevrolet Colorado Specifications". GM. Retrieved 2014-10-14.
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