The AD12 provides a proportional neutral delay. The AD12 speed boost, designed to prevent engine stalls under load, increases idle RPM as the clutch begins to engage.
| Valve Part# | Description |
| AD12-2101 | Direction Interlock |
| AD12-2201 | Supply |
| AD12-2301 | Speed Interrupt |
| AD12-2401 | Speed Boost |
| AD12-2501 | Neutral Delay |
Service Kit AD12-5001 is used on the old and new AD12 design.
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