M56H Transmission Fluid Change DIY - Matthews Volvo Site Sep 04, 2013M56H Transmission Fluid Change DIY. 1. 2 liters of Volvo Transmission fluid #31280771 Volvo V70 R, 2004-2007 Tags DIY, M56, M56H, manual transmission, Transmission Fluid Drain & Fill. One Reply to “M56H Transmission Fluid Change DIY” Paul Howard says: February 24, 2014 at 1:20 pm . Volvo M90 transmission - Wikipedia This gearbox is the strongest manual transmission that Volvo fitted to their rear-wheel-drive cars. The H2 and L2 versions are stronger than the H and L versions. There is a common disbelief that H is stronger than L, but the only difference between H and L is the gear ratio. In 1997, M90 H2 and M90 L2 were introduced.