A mechanical change gear transmission (10) having a geartrain (32) with at least one shaft (24) coupleabie to an internal combustion engine (14) having an engine cooling system (54) and an engine lubrication system (40), the engine lubrication system (40) having a pump (42) for circulating lubricating fluid from an engine sump (44) having a first engine port (48) in the engine sump that receives a lubricating fluid (50) and a second engine port (52) that provides a pressurized lubricating fluid, the transmission comprising:a transmission housing (28) defining a transmission sump (36) for collecting a volume of lubricating fluid (34) sufficient to provide splash lubrication to at least a portion of the geartrain (32), the transmission housing (28) having first (38) and second (60) transmission ports adapted for fluid coupling to the engine lubrication system (40), the second transmission port (60) being positioned higher than the first engine port 2(48) to facilitate gravity-forced return of lubricating fluid from the transmission sump (36) to the engine sump (44);a first conduit (70) for providing pressurized lubricating fluid from the second engine port (52) directly to the transmission sump (36) via the first transmission port (38) to provide lubrication for the transmission (12); and a second conduit (72) for returning lubricating fluid from the transmission (12) via the second transmission port (60) to the engine sump (44) via the first engine port (48) to allow cooling of the lubricating fluid by the engine cooling system (54).

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