e. Forward Clutch and Range Input Gear (fig. 1-13). The forward
clutch pack has a multiple function. Engaging the forward and first
clutches simultaneously produces the first range.
forward and the second, third, or fourth clutches at the same time
produces the second, third, or fourth ranges, respectively.
The forward clutch contains a clutch housing, external-tanged and
internal-tanged clutch plates, piston, and forward clutch and fourth
clutch driving hub.
The clutch housing has an oil collector ring attached to its inner
diameter that works with a pitot tube to produce front governor
pressure (G1). The clutch housing contains the forward clutch piston
positioned inside the housing bore and retained by the piston return
springs, a spring retainer, and snap-ring.
Through the use of splines, the internal-splined clutch plates attach
to the forward clutch hub, and the external-tanged clutch plates
anchor against the internal grooves of the forward clutch housing.
The forward clutch housing rotates when the converter turbine
Additionally, the fourth clutch drive hub rotates causing
the internal-splined plates of the fourth clutch pack to rotate.
causes the clutch plates to compress and locks the forward clutch hub
to the forward housing.
Since the hub has splines attaching it to
the transmission main shaft, the shaft rotates the hub at input
To produce one forward or reverse range, two clutches must be applied
together. The transmission applies the forward clutch in the forward
Rotation of the oil (pitot) collector ring directs oil against the
pitot tube anytime the converter turbine rotates; therefore, an
increase in turbine pressure produces a proportional increase in the
front governor pressure.
f. The Fourth Clutch (fig. 1-13).
This clutch has a dual
When engaged with the forward clutch, the two clutches
produce the fourth range. When this clutch engages with the first or
second clutch, they produce one of the two reverse ranges.
This clutch contains external-splined and internal-tanged clutch
plates, a piston positioned inside the housing bore and retained by
the piston return springs, a spring retainer and snap-ring.