GM 6L transmission

6L 45 · 6L 50 · 6L 80 · 6L 90
6L 45 · 6L 50 · 6L 80 · 6L 90
	A Hydra-Matic 6L80 transmission at the Ypsilanti Automotive Heritage Museum
Overview
Manufacturer	General Motors
Production	2005–present
Body and chassis
Class	6-Speed Longitudinal; Automatic Transmission
Related	Aisin AWTF-80 SC; Ford 6R; ZF 6HP
Chronology
Predecessor	4L60-E · 4L65-E; 5L40-E · 5L50
Successor	8L 45 · 8L 90

The 6L 50 (and similar 6L 45) is a 6-speed longitudinally-mounted automatic transmission produced by General Motors. It is very similar in design to the larger GM 6L 80 and 6L 90, 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 6L 50 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 6L 45 version is used in certain BMW vehicles and the Cadillac ATS, as part of either rear-wheel drive and all-wheel drive powertrains.

The 6L 80 (and similar 6L 90) is a six-speed automatic transmission built by General Motors at its Willow Run Transmission plant in Ypsilanti, MI. It was introduced in late 2005, and is very similar in design to the smaller 6L 45 and 6L 50, produced at GM Powertrain in Strasbourg, France.

It features clutch to clutch shifting, eliminating the one-way clutches used on older transmission designs. In February 2006 GM announced that it would invest $500 million to expand the Toledo Transmission plant in Toledo, Ohio to produce the 6L 80 in 2008. Torque rating 6L 80 590 lb⋅ft (800 N⋅m), 6L 90 885 lb⋅ft (1,200 N⋅m) and is adaptable to rear-wheel drive and all-wheel drive applications.

Specifications edit

Basic concept edit

A conventional planetary gearset and a compound Ravigneaux gearset is combined in a Lepelletier gear mechanism,^[1] to reduce both the size and weight. It was first realized with the 6HP from ZF Friedrichshafen. Like all transmissions realized with Lepelletier transmissions, the 6L also dispenses with the use of the direct gear ratio, making it one of the very few automatic transmission concepts without such a ratio.

It also has the capability to achieve torque converter lock-up on all six forward gears, and disengage it completely when at a standstill, significantly closing the fuel efficiency gap between automatic and manual transmissions.

Technical data edit

Gear Teeth and Ratios^[a]^[b]^[c]		Planetary Gearset: Teeth^[d] Lepelletier Gear Mechanism			Count	Total	Avg.
Gear Teeth and Ratios^[a]^[b]^[c]		Simple	Ravigneaux		Count	Total	Avg.

Model	Version First Delivery	${S_{1}}$ ^[e] ${R_{1}}$ ^[f]	${S_{2}}$ ^[g] ${R_{2}}$ ^[h]	${S_{3}}$ ^[i] ${R_{3}}$ ^[j]	Brakes Clutches	Ratio Span	Gear Step
Gear $n$	R	1	2	3	4	5	6
Step $i_{n-1}/i_{n}$	–R : 1		1 : 2	2 : 3	3 : 4	4 : 5	5 : 6

6L 45 MYA 6L 50 MYB	450 N⋅m (332 lb⋅ft) 500 N⋅m (369 lb⋅ft) · 2006	49 89	37 47	47 97	2 3	6.0346	1.4326
Ratio $i_{n}$	−3.2001 $-{\tfrac {13,386}{4,183}}$	4.0650 ${\tfrac {629,142}{154,771}}$	2.3712 ${\tfrac {15,617}{6,586}}$	1.5506 ${\tfrac {138}{89}}$	1.1567 ${\tfrac {13,386}{11,573}}$	0.8532 ${\tfrac {13,386}{15,689}}$	0.6736 ${\tfrac {97}{144}}$
Step	0.7872		1.7143	1.5293	1.3406	1.3557	1.2662

6L 80 MYC 6L 90 MYD	800 N⋅m (590 lb⋅ft) · 2005 1,200 N⋅m (885 lb⋅ft)	50 94	35 46	46 92	2 3	6.0401	1.4329
Ratio $i_{n}$	−3.0638 $-{\tfrac {144}{47}}$	4.0267 ${\tfrac {6,624}{1,645}}$	2.3635 ${\tfrac {3,888}{1,645}}$	1.5319 ${\tfrac {72}{47}}$	1.1522 ${\tfrac {6,624}{5,749}}$	0.8521 ${\tfrac {144}{169}}$	0.6667 ${\tfrac {2}{3}}$
Step	0.7607		1.7037	1.5429	1.3296	1.3522	1.2781

ZF 6HP all^[k]	2000	37 71	31 38	38 85	2 3	6.0354	1.4327
Ratio $i_{n}$	−3.4025 $-{\tfrac {4,590}{1,349}}$	4.1708 ${\tfrac {9,180}{2,201}}$	2.3397 ${\tfrac {211,140}{90,241}}$	1.5211 ${\tfrac {108}{71}}$	1.1428 ${\tfrac {9,180}{8,033}}$	0.8672 ${\tfrac {9,180}{10,586}}$	0.6911 ${\tfrac {85}{123}}$
Step	0.8158		1.7826	1.5382	1.3311	1.3178	1.2549

Ratio R & Even	$-{\tfrac {R_{3}(S_{1}+R_{1})}{R_{1}S_{3}}}$	${\tfrac {R_{3}(S_{1}+R_{1})(S_{2}+R_{2})}{R_{1}S_{2}(S_{3}+R_{3})}}$		${\tfrac {R_{2}R_{3}(S_{1}+R_{1})}{R_{2}R_{3}(S_{1}+R_{1})-S_{1}S_{2}S_{3}}}$		${\tfrac {R_{3}}{S_{3}+R_{3}}}$
Ratio Odd	${\tfrac {R_{2}R_{3}(S_{1}+R_{1})}{R_{1}S_{2}S_{3}}}$		${\tfrac {S_{1}+R_{1}}{R_{1}}}$		${\tfrac {R_{3}(S_{1}+R_{1})}{R_{3}(S_{1}+R_{1})+S_{1}S_{3}}}$

^ The 6L-transmission is based on the Lepelletier gear mechanism, first realized in the ZF 6HP gearbox
^ Other gearboxes using the Lepelletier gear mechanism see infobox
^ Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage
^ Layout
(1) Planetary gearset 1 is on the input (turbine) side
(2) Output shaft is ring 3 (ring gear of gearset 3: outer Ravigneaux gearset)
^ Sun 1: sun gear of gearset 1
^ Ring 1: ring gear of gearset 1
^ Sun 2: sun gear of gearset 2: inner Ravigneaux gearset
^ Ring 2: ring gear of gearset 2: inner Ravigneaux gearset
^ Sun 3: sun gear of gearset 3: outer Ravigneaux gearset
^ Ring 3: ring gear of gearset 3: outer Ravigneaux gearset
^ First gearbox on the market to use the Lepelletier gear mechanism
for comparison purposes only

Features edit

	6L 45 MYA · 6L 50 MYB	6L 80 MYC · 6L 90 MYD
Input Capacity
Maximum engine power	315 bhp (235 kW)	555 bhp (414 kW)
Maximum gearbox torque	450 N⋅m (332 lb⋅ft) 480 N⋅m (354 lb⋅ft)	800 N⋅m (590 lb⋅ft) 1,200 N⋅m (885 lb⋅ft)
Maximum shift speed	7,000/min	6,200/min
Vehicle
Maximum Validated Weight Gross Vehicle Weight · GVW	5,000 lb (2,270 kg) 6,610 lb (3,000 kg)	15,000 lb (6,800 kg)
Maximum Validated Weight Gross Curb Vehicle Weight · GCVW	12,500 lb (5,670 kg)	21,000 lb (9,530 kg)
Gearbox
7-position quadrant	P · R · N · D · X · X · X^[a]
Case material	Die cast aluminum
Shift pattern (2)	Three-way on/off solenoids
Shift quality	Five variable bleed solenoid
Torque converter clutch	Variable Bleed Solenoid ECCC
Converter size	240 mm (9.45 in)	258 mm (10.16 in)
Fluid type	DEXRON VI
Fluid capacity	9.1 kg with 258 & 300 mm
Available Control Features
Shift Patterns	Multiple (Selectable)
Driver Shift Control	Tap Up · Tap Down
Shifting	Enhanced Performance Algorithm Shifting (PAS)
Additional Modes	Tow & Haul Mode (Selectable)
Engine Torque Management	On All Shifts
Shift Control	Altitude & Temperature Compensation Adaptive Shift Time Neutral Idle Reverse Lockout Automatic Grade Braking
Additional Features
Control	OBDII · EOBD Integral Electro/Hydraulic Controls Module (Tehcm) Control Interface Protocol – GMLAN The transmission control module (TCM) is built into the solenoid pack/housing
Assembly sites	GMPT^[b] Strasbourg · France GMPT^[b] Toledo · Ohio · USA GMPT^[b] Silao · Mexico

^ X: available calibratable range position
^ ^a ^b ^c General Motors Powertrain

Applications edit

6L 45 MYA edit

2007–2010: BMW X3 - 3.0si / 2.5si / 3.0i
2007–2013: BMW 3 series - 330(x)i / 328(x)i / 325(x)i / 323i / 320i / 318i / 316i
2007–2019: BMW 1 series - 130i / 128i / 125i / 120i / 118i / 116i
2009–2015: BMW X1 (E84) - 2.8i xDrive / 2.5i xDrive / 1.8i sDrive
2013–2015: Cadillac ATS^[2]
2010–2013: Cadillac SLS
2012–2017: Chevrolet Caprice PPV V6
2011–2013: Holden VE Commodore, Calais, SV6
2013–2017: Holden VF Commodore, Calais, SV6

References edit

^ Riley, Mike (2013-09-01). "Lepelletier Planetary System". Transmission Digest. Archived from the original on 2023-06-21. Retrieved 2023-03-03.
^ Csere, Csaba (March 2012). Dissected: 2013 Cadillac ATS. Hearst Communications, Inc. ISBN 9781858941905. OCLC 38224673. Archived from the original on 2012-10-30. Retrieved 2012-11-21. {{cite book}}: |work= ignored (help)
^ "2015 Chevrolet Colorado Specifications". GM. Retrieved 2014-10-14.
^ "TATA HEXA".
^ "UAZ Patriot".
^ "Bremach Suv".
^ "GM Corporate Newsroom - United States - Home". media.gm.com. Retrieved 2016-10-26.

External links edit

[2] The 6L-transmission is based on the Lepelletier gear mechanism, first realized in the ZF 6HP gearbox

[3] Other gearboxes using the Lepelletier gear mechanism see infobox

[4] Differences in gear ratios have a measurable, direct impact on vehicle dynamics, performance, waste emissions as well as fuel mileage

[5] Layout
(1) Planetary gearset 1 is on the input (turbine) side
(2) Output shaft is ring 3 (ring gear of gearset 3: outer Ravigneaux gearset)

[6] Sun 1: sun gear of gearset 1

[7] Ring 1: ring gear of gearset 1

[8] Sun 2: sun gear of gearset 2: inner Ravigneaux gearset

[9] Ring 2: ring gear of gearset 2: inner Ravigneaux gearset

[10] Sun 3: sun gear of gearset 3: outer Ravigneaux gearset

[11] Ring 3: ring gear of gearset 3: outer Ravigneaux gearset

[12] First gearbox on the market to use the Lepelletier gear mechanism
for comparison purposes only

[13] X: available calibratable range position

[GMPT-14] General Motors Powertrain

[1] Riley, Mike (2013-09-01). "Lepelletier Planetary System". Transmission Digest. Archived from the original on 2023-06-21. Retrieved 2023-03-03.

[csere-15] Csere, Csaba (March 2012). Dissected: 2013 Cadillac ATS. Hearst Communications, Inc. ISBN 9781858941905. OCLC 38224673. Archived from the original on 2012-10-30. Retrieved 2012-11-21. {{cite book}}: |work= ignored (help)

[ccolu-16] "2015 Chevrolet Colorado Specifications". GM. Retrieved 2014-10-14.

[17] "TATA HEXA".

[uaz-18] "UAZ Patriot".

[bremach-19] "Bremach Suv".

[20] "GM Corporate Newsroom - United States - Home". media.gm.com. Retrieved 2016-10-26.

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GM 6L transmission

Contents

Specifications edit

Basic concept edit

Technical data edit

Features edit

Applications edit

6L 45 MYA edit

6L 50 MYB edit

6L 80 MYC edit

6L 90 MYD edit

See also edit

References edit

External links edit