Also known as: m56, m58, m59, volvo m56, volvo 5-speed manual
Volvo's five-speed manual transaxle — in the 850, S40, V40, C30, C70, S60, S80 and V70.
It is the gearbox the M66 replaced, and telling them apart is most of why this page exists: nothing outside the car distinguishes a five-speed Volvo transaxle from a six-speed one, the model years overlap for a decade, and a parts listing that says only manual covers both.
The M58 and M59 are the same gearbox with different final drives, fitted to the higher-output and turbocharged cars. They are not stronger in any structural sense, so a diagnosis does not change between them — but a ratio, a speedometer calibration or a differential part does.
Its characteristic failure is the input shaft bearing, and it announces itself in a way that is close to diagnostic: a whine or growl present in neutral with the clutch pedal out, which goes quiet the moment the pedal is pressed. Pressing the pedal unloads that exact bearing; a noise that behaves the other way round is a different fault.
Second-gear synchro wear is the other recurring item, crunching on a fast change when cold and nowhere else — and it is worth distinguishing from a clutch that is not fully releasing, which produces the same crunch in every gear rather than only in second.
A vague or notchy change is usually the linkage. Cables and bushes are a fraction of the cost of anything inside the gearbox, and they are what wears first.
Cars fitted with this gearbox
10 generations. Only where a source names the model and the generation together — a gearbox is documented as a product far more often than as a fitment, so this list is deliberately shorter than the truth.
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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