Gearbox GM 6T45

The General Motors 6T45 6-speed automatic transmission was produced from 2008 to 2019 and installed in front-wheel drive models as the MH7 and all-wheel drive models as the MHC. In some markets, this automatic transmission is best known as the Chevrolet Captiva and Opel Antara automatic transmission.

Specifications

Type	automatic transmission
Number of gears	6
Type of drive	front / all wheel
Engine volume, l	up to 2.5
Torque output, Nm	up to 315
Recommended oil	DEXRON VI
Oil capacity, liter	8.2
Partial replacement, liter	5.0
Maintenance	every 60 000 km
Gearbox lifespan, km	~250 000 km
Weight, kg	84

Gear ratios GM 6T45

Using the example of a 2012 Chevrolet Captiva with a 2.4-liter engine:

Main	3.53
1st	4.584
2nd	2.964
3rd	1.912
4th	1.446
5th	1.000
6th	0.746
Reverse	2.943

Using

The transmission was installed on:

• Buick Envision 1 (D2XX) in 2014 – 2019;
• Buick LaCrosse 2 (GMX353) in 2009 – 2017;
• Buick Regal 5 (GMX350) in 2008 – 2017;
• Chevrolet Captiva 1 (C140) in 2011 – 2018;
• Chevrolet Epica 1 (V250) in 2008 – 2012;
• Chevrolet Equinox 2 (GMT192) in 2009 – 2017;
• Chevrolet Malibu 9 (V400) in 2015 – 2018;
• Chevrolet Orlando 1 (J309) in 2011 – 2015;
• Chevrolet Trax 1 (U200) in 2013 – 2019;
• Daewoo Tosca 1 (V250) in 2008 – 2011;
• GMC Terrain 1 (GMT177) in 2009 – 2017;
• Opel Antara A (L07) in 2010 – 2015;
• Opel Astra J (P10) in 2009 – 2018;
• Opel Cascada A (W13) in 2013 – 2019;
• Opel Insignia A (G09) in 2013 – 2017;
• Opel Zafira C (P12) in 2011 – 2019.

Disadvantages of the GM 6T45 gearbox

• The most common failure of this transmission is a cracked spring disc in the 3-5-R drum;
• Then its retainer usually breaks, scattering debris throughout the oil system;
• Installing a reinforced original won’t help here, but there are non-original solutions;
• In early versions of the transmission, there were cases of differential bolts loosening;
• Other problems here are related to overheating or solenoids failing.