M40 is a four speed
gearbox[?] from
Volvo used in
Volvo PV[?],
Volvo Amazon,
Volvo 140[?] and
Volvo 240[?] from
1975. A version with
overdrive[?] called
M41 and a strenghtened version called
M400 was also made.
It is also an English motorway, see
M40 motorway