In the Astra H diesel range, on the Z17DTH engine, two manual gearboxes were available: the five speed F23 and the six speed M32.
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The known weakness of the M32 is wear of the bearings and the synchro rings: a whine while driving, a stiff shift, especially 3rd to 4th. Replacement or a rebuild is expensive.
What to check
- Count the gears: 6 raises the M32 suspicion on this engine group; 5 means more likely the F23
- When warm, at 80 to 100 km/h, listen for gearbox whine: a noise that rises with the revs is suspect
- Try the 3 to 4 and 4 to 5 shifts cold and warm: binding, scratchiness