Dodge Dakota (R1). Manual — part 626
DISASSEMBLY
(1) Remove waved snap-ring and remove pressure
plate, clutch plates and clutch discs (Fig. 86).
(2) Compress clutch piston spring with Compressor
Tool C-3575-A (Fig. 87). Be sure legs of tool are
seated squarely on spring retainer before compress-
ing spring.
(3) Remove retainer snap-ring and remove com-
pressor tool.
(4) Remove spring retainer and clutch spring. Note
position of retainer on spring for assembly reference.
Fig. 85 Front Clutch Components
1 - SNAP-RING (WAVE)
7 - SEAL
2 - REACTION PLATE
8 - PISTON
3 - CLUTCH DISC
9 - SPRING
4 - CLUTCH PLATE
10 - SNAP-RING
5 - SEAL
11 - SPRING RETAINER
6 - CLUTCH RETAINER
21 - 148
AUTOMATIC TRANSMISSION - 42RE
AN
FRONT CLUTCH (Continued)
(5) Remove clutch piston from clutch retainer.
Remove piston by rotating it up and out of retainer.
(6) Remove seals from clutch retainer piston bore
and clutch retainer hub. Discard both seals as they
are not reusable.
Fig. 86 42RE Front Clutch Components
1 - SNAP-RING (WAVE)
7 - SEAL
2 - REACTION PLATE
8 - PISTON
3 - CLUTCH DISC
9 - SPRING
4 - CLUTCH PLATE
10 - SNAP-RING
5 - SEAL
11 - SPRING RETAINER
6 - CLUTCH RETAINER
AN
AUTOMATIC TRANSMISSION - 42RE
21 - 149
FRONT CLUTCH (Continued)
INSPECTION
Inspect the front clutch components. Replace the
clutch discs if warped, worn, scored, burned or
charred, or if the facing is flaking off. Replace the
steel plates if heavily scored, warped, or broken. Be
sure the driving lugs on the plates are in good con-
dition. The lugs must not be bent, cracked or dam-
aged in any way.
Replace the clutch spring and spring retainer if
either is distorted, warped or broken.
Check the lug grooves in the clutch retainer. The
steel plates should slide freely in the slots. Replace
the retainer if the grooves are worn or damaged.
Check action of the check ball in the retainer (Fig.
88). The ball must move freely and not stick.
NOTE: Inspect the clutch retainer bushings care-
fully (Fig. 89). The retainer bushings are NOT ser-
viceable. It will be necessary to replace the retainer
if either bushing is scored, or worn.
Inspect the piston and retainer seal surfaces for
nicks or scratches. Minor scratches can be removed
with crocus cloth. However, replace the piston and/or
retainer if the seal surfaces are seriously scored.
ASSEMBLY
NOTE: The 42RE transmission uses four plates and
discs for the front clutch.
(1) Soak clutch discs in transmission fluid while
assembling other clutch parts.
(2) Install new seals in the clutch retainer lower
groove and on outer diameter of the retainer hub. Be
sure lip of each seal faces interior of clutch retainer.
(3) Lubricate lips of the retainer seals with liberal
quantity of Mopar® Door Ease. Then lubricate
retainer hub, bore and piston with light coat of trans-
mission fluid.
(4) Install clutch piston in retainer (Fig. 90). Use
twisting motion to seat piston in bottom of retainer.
CAUTION: Never push the clutch piston straight in.
This will fold the seals over causing leakage and
clutch slip.
(5) Position spring in clutch piston (Fig. 91).
Fig. 87 Compressing Front Clutch Piston Spring
1 - FRONT CLUTCH SPRING
2 - COMPRESSOR TOOL C-3575-A
3 - RETAINER SNAP-RING
4 - SPRING RETAINER
Fig. 88 Front Clutch Piston Retainer Check Ball
Location
1 - RETAINER CHECK BALL
Fig. 89 Retainer Bushing Location/Inspection
1 - FRONT CLUTCH RETAINER BUSHINGS (NON-
SERVICEABLE)
21 - 150
AUTOMATIC TRANSMISSION - 42RE
AN
FRONT CLUTCH (Continued)
(6) Position spring retainer on top of piston spring.
Make sure retainer is properly installed (Fig. 86).
(7) Compress piston spring and retainer with Com-
pressor Tool C-3575-A (Fig. 87). Then install new
snap-ring to secure spring retainer and spring.
(8) Install clutch plates and discs (Fig. 86). Install
steel plate then disc until all plates and discs are
installed. The front clutch uses 4 clutch discs and
plates in a 42RE transmission.
(9) Install pressure plate and waved snap-ring
(Fig. 86).
Clearance should be 1.70 to 3.40 mm (0.067 to
0.134 in.). If clearance is incorrect, clutch discs,
plates, pressure plates and snap-ring may have to be
changed.
FRONT SERVO
DESCRIPTION
The kickdown servo (Fig. 92) consists of a two-land
piston with an inner piston, a piston rod and guide,
and a return spring. The dual-land piston uses seal
rings on its outer diameters and an O-ring for the
inner piston.
OPERATION
The application of the piston is accomplished by
applying pressure between the two lands of the pis-
ton. The pressure acts against the larger lower land
to push the piston downward, allowing the piston rod
to extend though its guide against the apply lever.
Release of the servo at the 2-3 upshift is accom-
plished by a combination of spring and line pressure,
acting on the bottom of the larger land of the piston.
The small piston is used to cushion the application of
the band by bleeding oil through a small orifice in
the larger piston. The release timing of the kickdown
servo is very important to obtain a smooth but firm
shift. The release has to be very quick, just as the
front clutch application is taking place. Otherwise,
engine runaway or a shift hesitation will occur. To
accomplish this, the band retains its holding capacity
until the front clutch is applied, giving a small
amount of overlap between them.
Fig. 90 Front Clutch Piston Installation
1 - CLUTCH PISTON
2 - FRONT CLUTCH RETAINER
Fig. 91 Clutch Piston Spring Installation
1 - RETAINER
2 - CLUTCH SPRING
3 - PISTON
Fig. 92 Front Servo
1 - VENT
2 -PISTON ROD
3 - PISTON
4 - SPRING
5 - RELEASE PRESSURE
6 - APPLY PRESSURE
AN
AUTOMATIC TRANSMISSION - 42RE
21 - 151
FRONT CLUTCH (Continued)
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