Gearbox Aisin TB-61SN

The Aisin TB-61SN 6-speed automatic transmission has been produced by the company since 2003 and is installed on many rear-wheel drive Toyota models under the symbol A761E and A761H. This automatic transmission is also installed on Hyundai sedans like the B600 or on Mazda coupes and roadsters like the SJ6A-EL.

TB-60 family: TB‑60SN, TB‑61SN, TB‑65SN, TB‑68LS.

Specifications

Production years	since 2003
Type	automatic transmission
Number of gears	6
Type of drive	all wheel / rear
Engine volume, l	up to 5.0
Torque output, Nm	up to 480
Recommended oil	Toyota ATF WS
Oil capacity, liter	10.8
Replacing the oil	every 60,000 km
Replacing the filter	every 60,000 km
Gearbox lifespan, km	~400 000
Weight, kg	109

Gear ratios Aisin TB-61SN

Using the example of a Lexus LS430 2005 with a 4.3 liter engine:

Main	3.615
1st	3.296
2nd	1.958
3rd	1.348
4th	1.000
5th	0.725
6th	0.582
Reverse	2.951

The transmission was installed on:

• Fiat 124 Spider I (348) in 2015 – 2019;
• Hyundai Genesis 1 (BH) in 2008 – 2013;
• Hyundai Equus 2 (VI) in 2009 – 2011;
• Lexus GS430 3 (S190) in 2005 – 2007;
• Lexus LS430 3 (XF30) in 2003 – 2006;
• Lexus SC430 2 (Z40) in 2005 – 2010;
• Mazda MX-5 III (NC) in 2005 – 2015; MX-5 IV (ND) since 2015;
• Mazda RX-8 I (SE) in 2005 – 2012;
• Toyota Celsior 3 (XF30) in 2003 – 2006;
• Toyota Century 2 (G50) in 2005 – 2016;
• Toyota Crown Majesta 4 (S180) in 2003 – 2009; Crown Majesta 5 (S200) in 2009 – 2013.

Disadvantages of the TB-61SN gearbox

• This is a fairly strong automatic transmission, but its service life greatly depends on the operating mode;
• With an active owner, the oil quickly becomes contaminated with wear products of the torque converter clutch;
• Then the dirty lubricant corrodes the channels in the valve body and damages the solenoids;
• Long-term operation with a worn torque converter clutch destroys the oil pump bushing;
• And this in turn leads to oil leaks, which is extremely dangerous for the gearbox.