Switch-Tronic is the name for a manual shift function on Alpina cars with automatic transmissions. It was introduced in 1992. When Switch-Tronic technology was introduced, it was revolutionary as it was the first to offer manual operation for automatic transmissions fitted to production vehicles. Currently, the vehicle manufacturer extensively uses the gearbox for its models, since Switch-Tronic offers not only the possibility of manual switching, but also special firmware that adapts the motor to the driver's wishes.
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Like Switch -Tronic works
Switch-Tronic is based on a traditional automatic transmission with a torque converter and planetary gear sets. Thanks to the special firmware, the gearbox works in different modes. It is set by default for comfortable driving. If necessary, the driver can switch to Sport mode, allowing gear changes to be carried out faster and at higher engine speeds. The manual mode is intended for even more dynamic driving. This allows for instant switching. In manual mode, the transmission can be conveniently controlled using shift paddles.
Popular transmissions with Switch-Tronic function
| Index | Manufacturer | Number of gears | Max. Torque, Nm | Max. Displacement, l | Year of Manufacture | Drive Type | Applicable Models |
| 5HP18 | ZF | 5 | 310 | 3.0 | 1999 | Rear | Alpina В3 (E36) |
| 5HP30 | ZF | 5 | 560 | 6.0 | 1992 | Rear | Alpina B10 (E39) |
| 6HP26 | ZF | 6 | 600 | 6.0 | 2001 | Front wheel, rear wheel, all-wheel drive | Alpina D3 Bi-Turbo; Alpina B5 (E60) |
| 8HP70 | ZF | 8 | 750 | 6.2 | 2010 | Rear wheel, all-wheel drive | Alpina D3 Biturbo (F30) |
Frequent defects in gearboxes with Switch-Tronic function
| Defects | Gearbox |
| Due to wear on the torque converter clutch, the transmission pump fails. | 5HP18 |
| Damage on the clutch drum occur quickly. | 5HP30; 5HP18 |
| The mechatronic unit often burns out, especially in hot weather. | 8HP70; 6HP26 |
| Worn bushings will cause transmission vibration and oil leakage. | 6HP26; 8HP70 |
| Clogged solenoid valves cause jerking when shifting. | 6HP26; 8HP70 |
| The plastic tray deforms and cracks. | 6HP26 |