Volvo M90
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M90 is the model designation for a Volvo gearbox that is found in Volvo 940/960 models from 1994-on. The 940 and 960 are one of the last true rear wheel driven Volvo's.
The gearbox is made by Getrag in Sweden and it is of a 3-axle design, deriving from the volvo M56 gearbox of the front wheel driven 850 series. It is rumored that the the gears between these gearboxes can be swapped.
The gearbox comes in 3 different flavors. There is a version for the cast iron 4 cylinder engines of the 940 (redblocks), the all aluminium 6 cylinder of the 960 (Whiteblocks) and the version for the Audi 6 cylinder diesel engine (D24TIC). The only difference is the bellhousing bolt pattern.
The variant for the 6 cylinder Volvo engine will fit on all 4/5/6 all aluminum volvo N/RN-series engines.
The clutch is hydraulically operated by a master/slave cylinder setup with a normal clutch fork + throw out bearing. The flywheel used with these gearboxes is a duall mass version to eliminate the noise that 3-axle gearboxes can make in neutral.
The M90 gearbox is available with different gear ratio's.
| Gear | M90H1 | M90H2 | M90L1 | M90L2 |
|---|---|---|---|---|
| 1 | 3.54:1 | 3.54:1 | 3.91:1 | 3.91:1 |
| 2 | 2.05:1 | 2.05:1 | 2.20:1 | 2.20:1 |
| 3 | 1.38:1 | 1.38:1 | 1.38:1 | 1.38:1 |
| 4 | 1.00:1 | 1.00:1 | 1.00:1 | 1.00:1 |
| 5 | 0.81:1 | 0.70:1 | 0.81:1 | 0.70:1 |
This gearbox is the strongest manual transmission that Volvo fitted to their RWD cars.
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