Bands; One Way Clutches; Parking Mechanism - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

3A2-18

Bands

The transmission utilizes two bands, the B1 band
(sometimes known as the 2-4 band), and the B2 band
(sometimes known as the low-reverse band).
The B1 band is a flexible band which is engaged by the
front servo piston. B1 is activated in second and fourth
gear. When activated B1 prevents the reverse sun gear
from rotating by holding the C3 clutch assembly stationary.
In second gear only the outer area of the apply piston is
utilized. In fourth gear both areas are utilized for greater
clamping force.

One way clutches

The transmission uses two OWCs, the 1-2 OWC and the
3-4 OWC. (Note that a third OWC is located in the torque
converter, also known as a sprag.)
The 1-2 OWC is located between the planetary carrier as-
sembly and the center support. This allows the carrier to
rotate around the center support in one direction only. The
one way clutch is engaged only in Drive 1.
This 3-4 OWC is located between the C4 and the C2 clutch
assemblies. This allows the C2 clutch to drive the forward
sun gear in first, second and third gears but unlocks in
fourth gear and during overrun.
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
The B2 band is a solid band which is engaged by the rear
servo piston. B2 is activated in Park, Reverse, Neutral
and Manual 1. When activated B2 prevents the planet car-
rier assembly from rotating. In Manual 1 only the inner
area of the apply piston is utilized. In Park, Reverse and
Neutral, both areas are utilized for greater clamping force.
Planetary gear set
The planetary gear set used in the transmission is a con-
ventional six pinion Ravigneaux compound gear set.
Y220_3A2280

Parking mechanism

When Park is selected the manual lever extends the park
rod rearwards to engage the parking pawl. The pawl will
engage the external teeth on the ring gear thus locking
the output shaft to the transmission case. When Park is
not selected a return spring holds the parking pawl clear
of the output shaft, preventing accidental engagement of
Park.
Y220_3A2290
Y220_3A2300
BTRA 4 AUTO TRANSMISSION
REXTON SM - 2004.4