TACshift (Touch Activated Control) is a manual gear shifting mode for automatic transmissions, which debuted on the Pontiac Grand Prix G-Force concept car in 2002. It also appeared on some versions of the Pontiac Grand Prix production model. It was later renamed TAPshift.
How it works
The GM 4T65E hydro-automatic electronically controlled transmission was equipped with the TACshift system. In automatic mode, the driver could choose from a few settings of the transmission. In manual mode, they could shift gears with the help of paddle shifters, marked as “+” and “-”.
Technical characteristics of transmission with the TACshift function
| Gearbox code | Car layout | Max engine capacity, L | Max torque, N·m | Production years | Model applications |
| GM 4T65E | FWD, AWD | 3.8 | 380 | 1995–2008 | Pontiac Grand Prix |
Common malfunctions
- The bearings break down over time.
- The clutch drums have a short lifespan.
- The bushes and drive chain wear out quickly.
- The solenoids get soiled if transmission fluid is not replaced on time.
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