TACshift (Touch Activated Control) is a manual shift function for automatic transmissions , first installed in the 2002 Pontiac Grand Prix G-Force concept car. It also appeared on some versions of the Pontiac Grand Prix production model. It was later renamed TAPshift.
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How TACshift works
The GM 4T65E hydro-automatic transmission with electronic control was developed with the TACshift system fitted. In automatic mode, the driver can choose between a few settings. In manual mode, shifting is possible with the shift paddles marked with “+” and “-“.
The technical details of gearboxes with the TACshift function
| Index | Type of drive | Max. Displacement, l | Max. Torque, Nm | Years of manufacture | Applicable models |
| GM 4T65E | Front Wheel, 4WD | 3.8 | 380 | 1995–2008 | Pontiac Grand Prix |
Frequent defects
- The bearings wear out over time.
- The clutch drums have a short lifespan.
- The bushings and drive chain wear out quickly.
- The solenoid valves become dirty if the transmission oil is not changed in time.