Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 08. MECHANISM AND FUNCTION 33. AUTOMATIC TRANSMISSION 07. Reduction Gears
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W1860BE.book Page 12 Tuesday, January 28, 2003 11:01 PM
REDUCTION GEARS
AUTOMATIC TRANSMISSION
7. Reduction Gears
A: MPT MODELS
Engine torque is transmitted from the rear planetary carrier to the reduction drive shaft and the re-
duction drive gear. The torque is then transmitted to the front final gears through the reduction driv-
en gear and drive pinion. The torque is also transmitted to the rear wheels from the transfer clutch
hub (welded to the side of the reduction drive gear) through the transfer clutch and the following
path:
rear drive shaft propeller shaft rear differential.
(1) (2) (3) (4)
(7)
(8)
(6) (5)
AT-01015
(1) Seal ring (4) Transfer clutch hub (7) Reduction drive shaft
(2) Ball bearing (5) Reduction driven gear (8) Drive pinion shaft
(3) Reduction drive gear (6) Ball bearing
4AT-12
W1860BE.book Page 13 Tuesday, January 28, 2003 11:01 PM
REDUCTION GEARS
AUTOMATIC TRANSMISSION
B: VTD MODELS
Engine power is transmitted from the rear planetary carrier to the intermediate shaft and the center
differential assembly. The input force to the center differential is transmitted from the front sun gear,
which is integrated with the intermediate shaft. The center differential front wheel side output is
transmitted from the center differential carrier, which is integrated with the reduction drive gear. The
rear wheel side output is transmitted from the rear sun gear in the center differential, which is inte-
grated with the rear drive shaft. Power transmission to the front wheels is then transmitted to the
final gear through the reduction driven gear and drive pinion. Power to the rear wheels is transmitted
sequentially from the rear drive shaft to the propeller shaft, rear differential and rear wheel.
(3) (4) (5)
(2)
(1)
(8)
(7) (6) AT-01308
(1) Intermediate shaft (5) Center differential assembly
(2) Seal ring (6) Reduction driven gear
(3) Ball bearing (7) Ball bearing
(4) Reduction drive gear (8) Drive pinion shaft
4AT-13
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