GM 6L transmission

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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 6-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. 6L 80 and 6L 90 are adaptable to rear-wheel drive and all-wheel drive applications.

Gear RatiosTemplate:Efn
Template:Diagonal split header	R	1	2	3	4	5	6	Total Span	Span Center	Avg. Step	Compo- nents

6L 45 · 6L 50	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	3 Gearsets 2 Brakes 3 Clutches
6L 80 · 6L 90	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round

ZF 6HP All · 2000Template:Efn	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round	Template:Round

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Specifications

Technical Data

Features
	6L 45 · MYA 6L 50 · MYB	6L 80 · MYC 6L 90 · MYD

Input Capacity
Maximum engine power	Template:Convert	Template:Convert
Maximum gearbox torque	Template:Convert Template:Convert	Template:Convert Template:Convert
Maximum shift speed	7,000/min	6,200/min
Vehicle
Maximum Validated Weight Gross Vehicle Weight · GVW	Template:Convert Template:Convert	Template:Convert
Maximum Validated Weight Gross Curb Vehicle Weight · GCVW	Template:Convert	Template:Convert
Gearbox
7-position quadrant	P · R · N · D · X · X · XTemplate:Efn
Case material	Die cast aluminum
Shift pattern (2)	3-way on/off solenoids
Shift quality	5 variable bleed solenoid
Torque converter clutch	Variable Bleed Solenoid ECCC
Converter size	Template:Convert	Template:Convert
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	GMPTTemplate:Efn Strasbourg · France GMPTTemplate:Efn Toledo · Ohio · USA GMPTTemplate:Efn Silao · Mexico

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Progress Gearset Concept

Main Objectives

The main objective in replacing the predecessor model was to improve vehicle fuel economy with extra speeds and a wider gear span to allow the engine speed level to be lowered (downspeeding). The layout brings the ability to shift in a non-sequential manner – going from gear 6 to gear 2 in extreme situations simply by changing one shift element (actuating clutch E and releasing brake A).

Extent

In order to increase the number of ratios, ZF has abandoned the conventional design method of limiting themselves to pure in-line epicyclic gearing and extended it to a combination with parallel epicyclic gearing. This was only possible thanks to computer-aided design and has resulted in a globally patent for this gearset concept. The 6L is based on the 6HP from ZF, which was the first transmission designed according to this new paradigm. After gaining additional gear ratios only with additional components, this time the number of components has to decrease while the number of ratios still increase. The progress is reflected in a much better ratio of the number of gears to the number of components used compared to existing layouts.

Innovation Strength Analysis
With Asessment	Output: Gear Ratios	Innovation Elasticity Template:Efn Δ Output : Δ Input	Input: Main Components
With Asessment	Output: Gear Ratios	Innovation Elasticity Template:Efn Δ Output : Δ Input	Total	Gearsets	Brakes	Clutches

6L Ref. Object	$n_{O 1}$ $n_{O 2}$	TopicTemplate:Efn	$n_{I} = n_{G} +$ $n_{B} + n_{C}$	$n_{G 1}$ $n_{G 2}$	$n_{B 1}$ $n_{B 2}$	$n_{C 1}$ $n_{C 2}$
Δ Number	$n_{O 1} - n_{O 2}$	TopicTemplate:Efn	$n_{I 1} - n_{I 2}$	$n_{G 1} - n_{G 2}$	$n_{B 1} - n_{B 2}$	$n_{C 1} - n_{C 2}$
Relative Δ	Δ Output $\frac{n_{O 1} - n_{O 2}}{n_{O 2}}$	$\frac{n_{O 1} - n_{O 2}}{n_{O 2}} : \frac{n_{I 1} - n_{I 2}}{n_{I 2}}$ $= \frac{n_{O 1} - n_{O 2}}{n_{O 2}}$ · $\frac{n_{I 2}}{n_{I 1} - n_{I 2}}$	Δ Input $\frac{n_{I 1} - n_{I 2}}{n_{I 2}}$	$\frac{n_{G 1} - n_{G 2}}{n_{G 2}}$	$\frac{n_{B 1} - n_{B 2}}{n_{B 2}}$	$\frac{n_{C 1} - n_{C 2}}{n_{C 2}}$

6L 5L40-E Template:Efn	6Template:Efn 5Template:Efn	ProgressTemplate:Efn	8 9	3Template:Efn 3	2 3	3 3
Δ Number	1	ProgressTemplate:Efn	-1	0	-1	0
Relative Δ	Template:Round $\frac{1}{5}$	Template:RoundTemplate:Efn $\frac{1}{5} : \frac{- 1}{9} = \frac{1}{5}$ · $\frac{- 9}{1} = \frac{- 9}{5}$	Template:Round $\frac{- 1}{9}$	Template:Round $\frac{0}{3}$	Template:Round $\frac{- 1}{3}$	Template:Round $\frac{0}{3}$

6L 3-SpeedTemplate:Efn	6Template:Efn 3Template:Efn	Market PositionTemplate:Efn	8 7	3Template:Efn 2	2 3	3 2
Δ Number	3	Market PositionTemplate:Efn	1	1	-1	1
Relative Δ	Template:Round $\frac{1}{1}$	Template:RoundTemplate:Efn $\frac{1}{1} : \frac{1}{7} = \frac{1}{1}$ · $\frac{7}{1} = \frac{7}{1}$	Template:Round $\frac{1}{7}$	Template:Round $\frac{1}{2}$	Template:Round $\frac{- 1}{3}$	Template:Round $\frac{1}{2}$

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Quality Gearset Concept

The ratios of the 6 gears are nicely evenly distributed in all versions. Exceptions are the large step from 1st to 2nd gear and the almost geometric steps from 3rd to 4th to 5th gear. They cannot be eliminated without affecting all other gears. As the large step is shifted due to the large span to a lower speed range than with conventional gearboxes, it is less significant. As the gear steps are smaller overall due to the additional gear(s), the geometric gear steps are still smaller than the corresponding gear steps of conventional gearboxes. Overall, therefore, the weaknesses are not overly significant. As the selected gearset concept saves up to 2 components compared to 5-speed transmissions, the advantages clearly outweigh the disadvantages.

It has a torque converter lock-up for all 6 forward gears, which can be fully disengage when stationary, largely closing the fuel efficiency gap between vehicles with automatic and manual transmissions.

In a Lepelletier gearset,^[1] a conventional planetary gearset and a composite Ravigneaux gearset are combined to reduce both the size and weight as well as the manufacturing costs. Like all transmissions realized with Lepelletier transmissions, the 6L also dispenses with the use of the direct gear ratio and is thus one of the very few automatic transmission concepts without such a ratio.

Gear Ratios
With AssessmentTemplate:Efn Template:Efn		Planetary Gearset: TeethTemplate:Efn Lepelletier Gear Mechanism			Count	TotalTemplate:Efn CenterTemplate:Efn	Avg.Template:Efn
With AssessmentTemplate:Efn Template:Efn		Simple	Ravigneaux		Count	TotalTemplate:Efn CenterTemplate:Efn	Avg.Template:Efn

Model Type	Version First Delivery	S₁Template:Efn R₁Template:Efn	S₂Template:Efn R₂Template:Efn	S₃Template:Efn R₃Template:Efn	Brakes Clutches	Ratio Span	Gear StepTemplate:Efn
Gear Ratio	R $i_{R}$	1 $i_{1}$	2 $i_{2}$	3 $i_{3}$	4 $i_{4}$	5 $i_{5}$	6 $i_{6}$
StepTemplate:Efn	$- \frac{i_{R}}{i_{1}}$ Template:Efn	$\frac{i_{1}}{i_{1}}$	$\frac{i_{1}}{i_{2}}$ Template:Efn	$\frac{i_{2}}{i_{3}}$	$\frac{i_{3}}{i_{4}}$	$\frac{i_{4}}{i_{5}}$	$\frac{i_{5}}{i_{6}}$
Δ StepTemplate:Efn Template:Efn			$\frac{i_{1}}{i_{2}} : \frac{i_{2}}{i_{3}}$	$\frac{i_{2}}{i_{3}} : \frac{i_{3}}{i_{4}}$	$\frac{i_{3}}{i_{4}} : \frac{i_{4}}{i_{5}}$	$\frac{i_{4}}{i_{5}} : \frac{i_{5}}{i_{6}}$
Shaft Speed	$\frac{i_{1}}{i_{R}}$	$\frac{i_{1}}{i_{1}}$	$\frac{i_{1}}{i_{2}}$	$\frac{i_{1}}{i_{3}}$	$\frac{i_{1}}{i_{4}}$	$\frac{i_{1}}{i_{5}}$	$\frac{i_{1}}{i_{6}}$
Δ Shaft SpeedTemplate:Efn	$0 - \frac{i_{1}}{i_{R}}$	$\frac{i_{1}}{i_{1}} - 0$	$\frac{i_{1}}{i_{2}} - \frac{i_{1}}{i_{1}}$	$\frac{i_{1}}{i_{3}} - \frac{i_{1}}{i_{2}}$	$\frac{i_{1}}{i_{4}} - \frac{i_{1}}{i_{3}}$	$\frac{i_{1}}{i_{5}} - \frac{i_{1}}{i_{4}}$	$\frac{i_{1}}{i_{6}} - \frac{i_{1}}{i_{5}}$

6L 45 · MYA 6L 50 · MYB	Template:Convert 2005	49 89	37 47	47 97	2 3	Template:Round Template:Round	Template:Round Template:Efn
Gear Ratio	Template:Font color	Template:Round $\frac{13, 386}{3, 293}$	Template:Font color	Template:Round $\frac{138}{89}$	Template:Font color	Template:Round $\frac{13, 386}{15, 689}$	Template:Round $\frac{97}{144}$
Step	Template:Font color Template:Efn	1.0000	Template:Font color Template:Efn	1.5293	Template:Font color	1.3557	1.2662
Step 2Template:Efn			Template:Font color Template:Efn	1.1408	Template:Font color Template:Efn	1.0703
Speed	Template:Font color	1.0000	1.7143	2.6216	Template:Font color	4.7643	6.0346
Δ Speed	Template:Font color	1.0000	0.7143	0.9073	Template:Font color Template:Efn	1.2499	1.2703

6L 80 · MYC 6L 90 · MYD	Template:Convert Template:Convert 2005 (all)	50 94	35 46	46 92	2 3	Template:Round Template:Round	Template:Round Template:Efn
Gear Ratio	Template:Font color	Template:Round $\frac{6, 624}{1, 645}$	Template:Font color	Template:Round $\frac{72}{47}$	Template:Font color	Template:Round $\frac{144}{169}$	Template:Round $\frac{2}{3}$
Step	Template:Font color Template:Efn	1.0000	Template:Font color Template:Efn	1.5429	Template:Font color	1.3522	1.2781
Step 2Template:Efn			Template:Font color Template:Efn	1.1604	Template:Font color Template:Efn	1.0580
Speed	Template:Font color	1.0000	1.7037	2.6286	Template:Font color	4.7258	6.0401
Δ Speed	Template:Font color	1.0000	0.7037	0.9249	Template:Font color Template:Efn	1.2310	1.3143

ZF 6HP	AllTemplate:Efn · 2000Template:Efn	37 71	31 38	38 85	2 3	Template:Round Template:Round	Template:Round Template:Efn
Gear Ratio	Template:Font color	Template:Round $\frac{9, 180}{2, 201}$	Template:Font color	Template:Round $\frac{108}{71}$	Template:Font color	Template:Round $\frac{4, 590}{5, 293}$	Template:Round $\frac{85}{123}$
Step	Template:Font color Template:Efn	1.0000	Template:Font color	1.5382	Template:Font color	1.3178	1.2549
Step 2Template:Efn			1.1589	1.1559	Template:Font color Template:Efn	1.0502
Speed	Template:Font color	1.0000	1.7826	2.7419	Template:Font color	4.8096	6.0354
Δ Speed	Template:Font color	1.0000	0.7826	0.9593	Template:Font color Template:Efn	1.1599	1.2258

Ratio R & Even	$- \frac{R_{3} (S_{1} + R_{1})}{R_{1} S_{3}}$	$\frac{R_{3} (S_{1} + R_{1}) (S_{2} + R_{2})}{R_{1} S_{2} (S_{3} + R_{3})}$		$\frac{R_{2} R_{3} (S_{1} + R_{1})}{R_{2} R_{3} (S_{1} + R_{1}) - S_{1} S_{2} S_{3}}$		$\frac{R_{3}}{S_{3} + R_{3}}$
Ratio Odd	$\frac{R_{2} R_{3} (S_{1} + R_{1})}{R_{1} S_{2} S_{3}}$		$\frac{S_{1} + R_{1}}{R_{1}}$		$\frac{R_{3} (S_{1} + R_{1})}{R_{3} (S_{1} + R_{1}) + S_{1} S_{3}}$
Algebra And Actuated Shift Elements
Brake ATemplate:Efn		❶	❶	❶	❶
Brake BTemplate:Efn	❶			❶		❶
Clutch CTemplate:Efn			❶				❶
Clutch DTemplate:Efn	❶	❶
Clutch ETemplate:Efn					❶	❶	❶

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Applications

6L 45 · MYA

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

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External links

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[1] Template:Cite web

[csere-2] Template:Cite book

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[5] Template:Cite news

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GM 6L transmission

Contents

Specifications

Technical Data

Progress Gearset Concept

Main Objectives

Extent

Quality Gearset Concept

Applications

6L 45 · MYA

6L 50 · MYB

6L 80 · MYC

6L 90 · MYD

See also

References

External links

Navigation menu

GM 6L transmission

Specifications

Technical Data

Progress Gearset Concept

Main Objectives

Extent

Quality Gearset Concept

Applications

6L 45 · MYA

6L 50 · MYB

6L 80 · MYC

6L 90 · MYD

See also

References

External links

Navigation menu

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