Subaru impreza 2002 Service Manual page 44

REVERSE IDLER GEAR ASSEMBLY (WITH SYNCHRONIZING MECHANISM)
Manual Transmission and Differential
D
To prevent rattling noise that may occur with the constant-mesh type reverse gearing, No.1 re-
verse idler gear is fitted with a subgear that has the same number of teeth as the No. 1 reverse
idler gear. The subgear is preloaded in the rotating direction by a spring so that it functions to re-
duce backlash between gear teeth and consequent rattling noise when the No. 1 reverse gear
meshes with the reverse drive gear.
(1) Subgear
(2) No. 1 reverse idler gear
(3) Spring
(4) Reverse drive gear
6MT-6
NF0601