engages an inclined surface 170 on the casing part 140 and thus releasably holds the sleeve 111 against movement to the right in the drawing the sleeve 111 can move to the right if the balls 166 are moved inwardly against the action of their aprings 167 so that each ball comes into contact with the inner cylindrical surface 171 on the casing part 140 the projection 164 and the detent 165 have been shown in the drawing in the same plane but they will in fact be circumferentially staggered around the periphery of the bearing housing 159 referring once more to the planet carrier 119 this is provided with an insert indicated generally at 172 which provides axially extending gear teeth 73 which can engage with the gear teeth 112 on the right hand end of the sleeve 111 the insert is a press fit into the planet carrier and is internally splined to engage the splines on the input shaft 110 a spring clip 174 surrounds the input shaft and holds the planet carrier against movement to the left a one way clutch 175 is interposed between the planet carrier and the annulus gear and this is lubricated by oil which is expelled from the passage 176 in the input shaft 110 and moves outwardly through the space 177 into the clutch 175 the oil then engages a thrower 178 which directs the oil into the collector ring 125 at its left hand end the input shaft 110 picks up lubricating oil from a cavity in a pedestal 179 forming part of the housing the operation of the gear change assembly will now be described first in overdrive ratio to select overdrive ratio hydraulic fluid is introduced into the.