TAPshift (Touch Activated Power) is a manual shift function for automatic transmissions . It is used in General Motors Group vehicles such as Saturn, Pontiac, Cadillac and Chevrolet cars.
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How TAPshift works
TAPshift is available for the electronically controlled Hydramatic transmissions. The paddle shifters marked “+” and “-” are used for manual shifting. To do this, the shift lever must be placed in the DSC position.
Popular TAPshift transmissions
| Index | Number of gears | Max. Torque, Nm | Max. Displacement, l | Type of drive | Year of manufacture | Applicable models |
| 6L90 | 6 | 900 | 6.5 | Rear wheel, all-wheel drive | 2006 | Chevrolet Silverado; Chevrolet Camaro; Cadillac CTS-V |
| 6L80 | 6 | 800 | 6,2 | Rear, 4WD | 2006 | Chevrolet Corvette; Chevrolet Tahoe; Chevrolet Camaro; Cadillac Escalade; Chevrolet Silverado; Holden VF Commodore; Cadillac XLR |
| 6L50 | 6 | 500 | 5,3 | Rear, 4WD | 2006 | Cadillac CTS; Holden Statesman; Cadillac SRX; Chevrolet Caprice; Cadillac SLS; Chevrolet Colorado; Cadillac STS; Holden Commodore |
| 6Т40 | 6 | 250 | 2,5 | Front Wheel, 4WD | 2007 | Chevrolet Malibu; Chevrolet Equinox |
| 8L90 | 8 | 1000 | 6.5 | Rear Wheel, 4WD | 2015 | Chevrolet Corvette; Cadillac ATS-V; Chevrolet Silverado; Cadillac Escalade; Cadillac CT6; Chevrolet Camaro; Cadillac CTS-V |
Common defects in TAPshift transmissions
| Defects | Transmission |
| The bushings and seals break pretty quickly. | GM 6L90; GM 6L50 |
| Continuous driving at high speeds can block the transmission pump. | GM 6L90; GM 6L50; GM 6L80 |
| The gear hub doesn't last long. | GM 6L90; GM 6L80 |
| Due to lack of fluid, the mechanical components of the transmission wear out prematurely. | GM 6L80 |
| The corrugated plate breaks, which can damage other parts of the gearbox. | GM 6Т40 |
| The hydraulic valve housing lines clog if the fluid is not is changed in time. | GM 6Т40; GM 6L90; GM 6L80 |
| The gearbox is prone to overheating. | GM 6Т40 |
| Due to clogging of the solenoid valves the gearbox jerks. | GM 8L90 |