M40 and M41 are both

gearboxes Propulsion transmission is the mode of transmitting and controlling propulsion power of a machine. The term ''transmission'' properly refers to the whole drivetrain, including clutch, gearbox, prop shaft (for rear-wheel drive vehicles), differe ...

produced by Koping Engineering for

Volvo The Volvo Group ( sv, Volvokoncernen; legally Aktiebolaget Volvo, shortened to AB Volvo, stylized as VOLVO) is a Swedish multinational manufacturing corporation headquartered in Gothenburg. While its core activity is the production, distributio ...

and used in

Volvo Duett The Duett is an automobile from Volvo that was in production from 1953 until 1969. The name ''Duett'' was intended to signify a car that could be used as a delivery vehicle during the week and as a comfortable sedan away from work. The Duett was ...

, Volvo Valp,

Volvo Amazon The Volvo Amazon was a mid-sized car manufactured and marketed by Volvo Cars from 1956 to 1970 and introduced in the United States as the ''122S'' at the 1959 New York International Auto Show. The Amazon shared the wheelbase, tall posture and h ...

Volvo 142 142 may refer to: * 142 (number), an integer * AD 142, a year of the Julian calendar * 142 BC, a year of the pre-Julian Roman calendar {{numberdis ...

and many more. It is a four speed gearbox. It was also available in s a stronger version called M400 and a three speed version called M30.

Gear Ratios

References

Volvo Cars Automobile transmissions {{Automotive-part-stub