Worn synchronizers
Synchronizers match the gear before it engages. When worn, the teeth meet and the gear crunches, often in first or in reverse.
COMMON FAILURES01 02 03
Gears that crunch
When the gear crunches (cold, in first, in reverse) and whether the engine still idles in neutral help separate the causes.
Possible causes
Clutch not fully disengaging
If the clutch does not fully disengage, the gear resists and crunches. A low fluid level or air in the circuit can be the cause.
Gearbox oil
Old oil or a low level reduces protection of the gears. The noise becomes clearer while the gearbox is cold.
Price benchmarks
| Repair | Observed range |
|---|---|
| Gearbox | 1200 – 3500 € incl. VAT |
| Clutch | 600 – 1500 € incl. VAT |
Prices observed in France, parts and labour included. Method and sources
Questions to ask the garage
- Has the gearbox oil been changed, and when?
- Does the clutch disengage properly with the engine running?
- Which part is held responsible, and based on which check?
Indicative preliminary diagnosis. Does not replace a vehicle inspection by a professional.
Describe your case
Describe your vehicle and what you observed: the analysis is based on your case.
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