Volvo M410 transmission

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The M410 gearbox was the overdrive equipped version of Volvo's M400 4-speed. Both M400 and M410 units were featured in Volvo's 6 cylinder engined 164 sedan. M410 gearboxes also appeared briefly in a modified version in the 1800 for the 1970 model year. It's a stronger version of the M41 gearbox. It can be identified by the drain plug being on the opposite side to the M40. While never factory equipped with the "long stick" shifter handle, the shifter interchanges, opening up possibilities for swaps. Owners have found that while the bearings' lifespan might be only barely the equal of the M40, the torque capacity is on the order of double. Ratios are effectively the same (though derived from a different tooth count) as the M40s and followed that transmission's change to a lower (numerically higher) first gear beginning with the 1973 model year.