TACshift: features, advantages & disadvantages

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.

Contents hide

1 How it works
2 Technical characteristics of transmission with the TACshift function
3 Common malfunctions

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.

Den

Den: a smiley technician with plenty of experience starring in AUTODOC’s video tutorials; Never seen without his goggles; races his BMW X5 E53; dreams about receiving a Gold Play Button for getting 1,000,000 subscribers on YouTube.