General Motors
Source-verified model
General Motors TAAT
TAAT automatic gearbox was released in 1991 by Saturn LLC. This type of gearbox was mainly used in 1991-UP Saturn S-Series. In terms of design TAAT is a parallel shaft FWD unit with the drive gear. TAAT has 4 forward gears and 1 reverse gear by means of multidisc clutches, 4-element torque converter with a lock-up clutch, 1-st sprag-type clutch, and a tooth clutch activated by a servo unit.
Speeds
4
Type
AT
Drive
FWD
ATF capacity (L)
6,2
ATF change (L)
4,2-5,2
ATF type
Dexron VI
Other and alternative codes of this transmission
TAAT
Saturn Taat
verified naming
OEM designation
source name
Common problems & symptoms
Problems and symptoms reported for this transmission, compiled from repair sources. Not a complete list.
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Valve Body Internal Wear
Most problematic component in TAAT; causes delays, slippages, kicks, and loss of Reverse gear.
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Delay or No Reverse
Reverse engagement delayed or absent; multiple root causes including valve body, shaft nut, sensor, or switch.
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Gear Shift Slippage
Slipping during gear changes, likely linked to valve body malfunction in TAAT transmission.
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Loose Main Shaft Nut
Loose-fitting main shaft nut can cause delayed or no Reverse condition in TAAT gearbox.
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Harsh Shift Kicks
Abrupt or harsh engagement kicks during shifting attributed to valve body issues.
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Malfunctioning Vehicle Speed Sensor
Faulty car speed sensor disrupts electronic control and can result in no-Reverse condition.
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Pattern Select Switch Misadjustment
Incorrect adjustment of the pattern select switch leads to no-Reverse or incorrect gear selection.
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Solenoid Failure Electronic Control
One or more of 5 solenoids may fail, disrupting shift timing, shift feel, and OBD diagnostics.
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About this transmission
Transmission general data
TAAT
automatic gearbox was released in 1991 by Saturn LLC. This type of gearbox was
mainly used in 1991-UP Saturn S-Series. In terms of design TAAT is a parallel
shaft FWD unit with the drive gear. TAAT has 4 forward gears and 1 reverse gear
by means of multidisc clutches, 4-element torque converter with a lock-up
clutch, 1-st sprag-type clutch, and a tooth clutch activated by a servo unit.
Technical issues and repair guidelines
One of the main peculiarities of this transmission in comparison with common automatic gearboxes lies in the electronic control. This gearbox uses 5 solenoids together with the transmission control module and its sensors to control shift timing, shift feel, and give on board diagnostics.
Repair specialists say that the valve body is the most problematic component in TAAT. Delays, slippages, kicks or lack of Reverse during gear-shifting are likely to be caused by valve body issues. However, there are several other sources of a Reverse problem:
1. Delay or no Reverse may be caused by the loose-fitting main shaft nut
2. Malfunctioning car speed sensor may also lead to no-Reverse condition.
3. Wrong adjustment of the pattern select switch
Vehicle fitment explorer
Confirmed vehicle applications. Every row is drawn from our source-verified fitment database.
| Make | Model | Year | Drive | Engine |
|---|---|---|---|---|
| Saturn | S-SERIES | 95-03 | 4 SP FWD | L4 1.9L |
Sources & Contribution
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