Engineering:GM 6L transmission

Short description: Automatic transmission family produced by General Motors

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 50 is adaptable to rear-wheel drive and all-wheel drive applications. The 6L 45 can accommodate engines with up to 332 lb⋅ft (450 N⋅m) of torque and vehicles with a GVWR up to 5,000 pounds (2,300 kg).

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).

Specifications

Gear Teeth and Ratios		Planetary Gearset: Teeth Lepelletier Gear Mechanism			Count	Total	Avg.
		Simple	Ravigneaux
Model	Version First Delivery	[math]\displaystyle{ {S_1} }[/math] [math]\displaystyle{ {R_1} }[/math]	[math]\displaystyle{ {S_{2.1}} }[/math] [math]\displaystyle{ {R_{2.1}} }[/math]	[math]\displaystyle{ {S_{2.2}} }[/math] [math]\displaystyle{ {R_{2.2}} }[/math]	Brakes Clutches	Ratio Span	Gear Step
Gear	R	1	2	3	4	5	6
Step [math]\displaystyle{ i_{n-1}/i_n }[/math]	–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 [math]\displaystyle{ i_n }[/math]	−3.2001 [math]\displaystyle{ -\tfrac{13,386}{4,183} }[/math]	4.0650 [math]\displaystyle{ \tfrac{629,142}{154,771} }[/math]	2.3712 [math]\displaystyle{ \tfrac{15,617}{6,586} }[/math]	1.5506 [math]\displaystyle{ \tfrac{138}{89} }[/math]	1.1567 [math]\displaystyle{ \tfrac{13,386}{11,573} }[/math]	0.8532 [math]\displaystyle{ \tfrac{13,386}{15,689} }[/math]	0.6736 [math]\displaystyle{ \tfrac{97}{144} }[/math]
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 [math]\displaystyle{ i_n }[/math]	−3.0638 [math]\displaystyle{ -\tfrac{144}{47} }[/math]	4.0267 [math]\displaystyle{ \tfrac{6,624}{1,645} }[/math]	2.3635 [math]\displaystyle{ \tfrac{3,888}{1,645} }[/math]	1.5319 [math]\displaystyle{ \tfrac{72}{47} }[/math]	1.1522 [math]\displaystyle{ \tfrac{6,624}{5,749} }[/math]	0.8521 [math]\displaystyle{ \tfrac{144}{169} }[/math]	0.6667 [math]\displaystyle{ \tfrac{2}{3} }[/math]
Step	0.7607		1.7037	1.5429	1.3296	1.3522	1.2781
ZF 6HP all	2000	37 71	31 38	38 85	2 3	6.0354	1.4327
Ratio [math]\displaystyle{ i_n }[/math]	−3.4025 [math]\displaystyle{ -\tfrac{4,590}{1,349} }[/math]	4.1708 [math]\displaystyle{ \tfrac{9,180}{2,201} }[/math]	2.3397 [math]\displaystyle{ \tfrac{211,140}{90,241} }[/math]	1.5211 [math]\displaystyle{ \tfrac{108}{71} }[/math]	1.1428 [math]\displaystyle{ \tfrac{9,180}{8,033} }[/math]	0.8672 [math]\displaystyle{ \tfrac{9,180}{10,586} }[/math]	0.6911 [math]\displaystyle{ \tfrac{85}{123} }[/math]
Step	0.8158		1.7826	1.5382	1.3311	1.3178	1.2549
Ratio R & Even	[math]\displaystyle{ -\tfrac{R_{2.2} (S_1+ R_1)}{R_1 S_{2.2}} }[/math]	[math]\displaystyle{ \tfrac{R_{2.2} (S_1+ R_1) (S_{2.1}+ R_{2.1})}{R_1 S_{2.1} (S_{2.2}+ R_{2.2})} }[/math]		[math]\displaystyle{ \tfrac{R_{2.1} R_{2.2} (S_1+ R_1)}{R_{2.1} R_{2.2} (S_1+ R_1)- S_1 S_{2.1} S_{2.2}} }[/math]		[math]\displaystyle{ \tfrac{R_{2.2}}{S_{2.2}+ R_{2.2}} }[/math]
Ratio Odd	[math]\displaystyle{ \tfrac{R_{2.1} R_{2.2} (S_1+ R_1)}{R_1 S_{2.1} S_{2.2}} }[/math]		[math]\displaystyle{ \tfrac{R_{2.2} (S_{2.1}+ R_{2.1})}{S_{2.1} (S_{2.2}+ R_{2.2})} }[/math]		[math]\displaystyle{ \tfrac{R_{2.2} (S_1+ R_1)}{R_{2.2} (S_1+ R_1)+ S_1 S_{2.2}} }[/math]

Features	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	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	6,613 lb (3,000 kg)	15,000 lb (6,800 kg)
Maximum Validated Weight Gross Curb Vehicle Weight · GCVW	12,505 lb (5,672 kg)	21,000 lb (9,500 kg)
Gearbox
7-position quadrant	P · R · N · D · X · X · X
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 · 258 mm
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 Strasbourg · France GMPT Toledo · Ohio · USA GMPT Silao · Mexico

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
• 2010–2013: Cadillac SLS
• 2012–2017: Chevrolet Caprice PPV V6
• 2011–2013: Holden VE Commodore, Calais, SV6
• 2013–2017: Holden VF Commodore, Calais, SV6

6L 50 MYB

• 2007–2011: Cadillac SLS
• 2007–2011: Cadillac STS
• 2007–2009: Cadillac SRX
• 2008–2015: Cadillac CTS
• 2010–2015: Camaro LS/LT (V6 Models)
• 2009–2011: Holden VE Commodore / Holden VE Berlina / Holden VE Calais / Chevrolet Lumina / Chevrolet Omega
• 2009–2011: Holden WM Statesman/Caprice / Daewoo Veritas
• 2015–2022: Chevrolet Colorado
• 2017–2020: Tata Hexa
• 2019–present: UAZ Patriot
• 2022–present: Bremach

6L 80 MYC

• 2006–2009 Cadillac XLR-V
• 2006–2013 Chevrolet Corvette
• 2006 Holden VE Commodore/2008-2009 Pontiac G8
• 2006–2013 Holden/Chevrolet WM Statesman/Caprice
• 2014–2017 Holden/Chevrolet WN Statesman/Caprice
• 2007–2013 GMC Sierra Denali
• 2009–2013 Chevrolet Silverado 1500 5.3 (ext. & crew cab), 6.2
• 2009–2013 GMC Sierra 1500 5.3 (ext. & crew cab), 6.2
• 2010–2013 Chevrolet Silverado 1500 5.3 (reg. cab)
• 2010–2013 GMC Sierra 1500 5.3 (reg. cab)
• 2006–2009 Cadillac STS-V
• 2007–2015 Cadillac Escalade
• 2007–2015 Cadillac Escalade ESV
• 2007–2013 Cadillac Escalade EXT
• 2007–2015 GMC Yukon Denali
• 2009–2020 Chevrolet Tahoe
• 2009–2020 GMC Yukon
• 2009–2020 Chevrolet Suburban 1500
• 2009–2020 GMC Yukon XL
• 2008–2009 Hummer H2
• 2014–2019 (K2XX) Chevrolet Silverado/GMC Sierra 1500
• 2010–2015 Chevrolet Camaro
• 2011–2017 Chevrolet Caprice PPV
• 2011(September)–2013 Holden VE Commodore Series 2(MY 2012)
• 2014–2017 Holden VF Commodore / Chevrolet SS
• 2009–2013 Chevrolet Avalanche
• 2019–2021 (T1XX) Chevrolet Silverado/GMC Sierra 1500

6L 90 MYD

• 2007–2014 Chevrolet Silverado 2500HD/3500 HD 6.0
• 2007–2014 GMC Sierra 2500HD/3500HD 6.0
• 2010–present Chevrolet Express 2500-3500
• 2010–present GMC Savana 2500-3500
• 2008–2013 Chevrolet Suburban 2500
• 2009–2013 Cadillac CTS-V
• 2012–2015 Chevrolet Camaro ZL1
• 2015–2019 Chevrolet Silverado 2500HD/3500 HD 6.0
• 2015–2019 GMC Sierra 2500HD/3500HD 6.0
• 2020–present Chevrolet Silverado 2500HD/3500 HD 6.6 L8T
• 2020–present GMC Sierra 2500HD/3500HD 6.6 L8T

See also

• List of GM transmissions
• Cadillac PDF info on 6L 80-E Transmission: http://www.cadillacfaq.com/stsfaq/tsb/data/tsb/05-07-30-023.pdf
• "GM Ypsilanti Begins 6-Speed Production". Automotive Design and Production. Archived from the original on March 3, 2006. https://web.archive.org/web/20060303042833/http://www.automfg.com/articles/wip/1205wip04.html. Retrieved January 3, 2006. 

External links

• General Motors Powertrain Division
• https://gmauthority.com/blog/gm/gm-transmissions/mya/
• https://gmauthority.com/blog/gm/gm-transmissions/myb/
• https://gmauthority.com/blog/gm/gm-transmissions/myc/
• https://gmauthority.com/blog/gm/gm-transmissions/myd/