1993 DODGE TRUCK Service Repair Manual

21
- 328
OVERDRIVE UNIT OVERHAUL—42RH/46RH
•

Fig.
21 Removing/Installing Output Shaft Front Bearing WARNING: THE NEXT STEP IN GEARTRAIN
DISASSEMBLY INVOLVES COMPRESSING THE DI­
RECT CLUTCH SPRING. IT IS EXTREMELY IMPOR­
TANT THAT PROPER EQUIPMENT BE USED TO COMPRESS THE SPRING AS SPRING FORCE IS
APPROXIMATELY 800 POUNDS. USE SPRING COM­ PRESSOR TOOL C-6227-1 AND A HYDRAULIC-
TYPE SHOP PRESS WITH A MINIMUM RAM
TRAVEL OF 5-6 INCHES. THE PRESS MUST ALSO HAVE A BED THAT CAN BE ADJUSTED UP OR
DOWN AS REQUIRED. RELEASE CLUTCH SPRING
TENSION SLOWLY AND COMPLETELY TO AVOID PERSONAL INJURY.
(7) Mount geartrain assembly in shop press
(8) Position Compressor Tool 6227-1 on clutch hub
(Fig. 22). Support output shaft flange with steel press
plates as shown and center assembly under press ram.
(9) Use Bushing Tool MB990891 (or similar size
tool) at top of Tool 6227-1 to help distribute load and
provide needed extra press length.
(10) Apply press pressure slowly. Compress hub
and spring far enough to expose clutch hub retaining
ring and relieve spring pressure on clutch pack snap
ring (Fig. 22).
(11) Remove direct clutch pack snap ring first (Fig.

22).

(12) Remove direct clutch hub retaining ring (Fig.

23).
(13) Release press load on clutch spring slowly
and completely. Remove press tools and geartrain. (14) Remove direct clutch pack from hub (Fig. 24). (15) Remove direct clutch hub and spring (Fig. 25).
(16) Remove sun gear and spring plate, planetary
thrust bearing and planetary gear (Fig. 26). (17) Remove overrunning clutch assembly with ex­
panding type snap ring pliers (Fig. 27). Insert pliers
Fig.
22
Removing
Direct
Clutch
Pack
Snap
Ring

Fig.
23
Removing
Direct
Clutch
Hub Retaining
Ring

into clutch hub. Expand pliers to grip hub splines and remove clutch with counterclockwise, twisting
motion.
(18) Remove thrust bearing from overrunning
clutch hub (Fig. 28). (19) Remove overrunning clutch from hub (Fig.

28).

•

OVERDRIVE
UNIT OVERHAUL—42RH/46RH 21 - 321
Fig. 24 Direct Clutch Pack Removal Fig. 27 Removing Overrunning Clutch Assembly

J9121-312

Fig. 26 Removing Sun Gear/Thrust Bearing/Planetary Gear

21
- 330
OVERDRIVE
UNIT
OVERHAUL—42RH/46RH

•

DIRECT

CLUTCH
DRUM

PUNCH
8921-249
OUTER

RETAINING
RING
J9121-293

Fig.
29 Marking Direct
Clutch
Drum
And
Annulus
Gear
For
Assembly
Alignment

INNER

RETAINING
RING DIRECT

CLUTCH
DRUM
Fig.
31
Removing
Clutch
Drum
Outer Retaining

Ring

OUTPUT
SHAFT-
ANNULUS
GEAR

J9121-292

Fig.
30
Removing
Clutch
Drum
Inner
Retaining
Ring
(20) Mark position of annulus gear and direct
clutch drum for assembly alignment reference (Fig.
29).
Use small center punch or scriber to make align­
ment marks.
(21) Remove direct clutch drum rear retaining ring
(Fig. 30).
(22) Remove direct clutch drum outer retaining
ring (Fig. 31).
(23) Mark annulus gear and output shaft for as­
sembly alignment reference (Fig. 32). (24) Remove annulus gear from output shaft (Fig.

33).
Use rawhide or plastic mallet to tap gear off shaft.
(25) Remove output shaft front bearing if not pre­
viously removed.

OVERDRIVE
UNIT
CLEANING
AND
INSPECTION
Clean the geartrain (Fig. 34) and case components
(Fig. 35) with solvent. Dry all parts except the bear­
ings with compressed air. Allow bearings to air dry. Do not use shop towels for wiping parts dry unless
the towels are made from a lint-free material. A suf-
PUNCH
J9221-46

Fig.
32 Marking
Annulus
Gear And Output Shaft For
Assembly
Alignment

OUTPUT
SHAFT

ANNULUS
GEAR
J9021-288

Fig.
33
Removing
Annulus
Gear ficient quantity of lint (from shop towels, cloths,

rags,
etc.) could plug the transmission filter and fluid
passages.

•

OVERDRIVE
UNIT
OVERHAUL—42RH/46RH
21 - 331
OVERDRIVE CLUTCH PISTON
RETAINER
SPRING

PLATE
THRUST
SUN
PLANETARY
GEAR

BEARING
GEAR
OVERRUNNING CLUTCH
OUTER
RETAINING RING f
DIRECT CLUTCH DRUM
INNER
RETAINING RING
OVERDRIVE
CLUTCH PISTON
PISTON

THRUST
PLATE
(SELECTIVE) CLUTCH HUB

SNAP
RING
PISTON

THRUST

BEARING

CLUTCH PACK RETAINING RING
OVERDRIVE
CLUTCH PACK REACTION
PLATE REACTION

SNAP
RING
J9J21-289

SEAL

Fig. 34
Overdrive
Geartrain
Components
(42RH
Shown)

ACCESS
PLATE AND GASKET
CASE
GASKET
PLATE

SPACER

INSULATOR

DAMPER

WEIGHT
SHAFT
RETAINING BOLT

PARK
PAWL
SPRING
REACTION
PLUG AND SNAP RING
PARK
LOCK ROD
J9121-290

Fig. 35
Overdrive
Case
And
Park
Lock
Components

21
- 332
OVERDRIVE
UNIT
OVERHAUL—42RH/46RH

•

GOVERNOR GOVERNOR REAR BEARING
OUTPUT SHAFT

Fig.
36 Output Shaft And Discard the old case gasket and seals. Do not at­
tempt to salvage these parts. They are not reusable. Replace any of the overdrive unit snap rings if dis­
torted or damaged.
Minor nicks or scratches on components can be
smoothed with crocus cloth. However, do not attempt
to reduce severe scoring on any components with abrasive materials. Replace severely scored compo­

nents;
do not try to salvage them.
Check condition of the park lock components and
the overdrive case (Fig. 36).
Replace the case if cracked, scored, or damaged.
Replace the park lock pawl, plug, or spring if worn or
damaged. Re sure the bullet at the end of the park lock rod is in good condition. Replace the rod if the
bullet is worn or the rod itself is bent or distorted. Do not attempt to straighten the rod.
Check the bushings in the overdrive case. Replace
the bushings if severely scored or worn. Also replace
the case seal if loose, distorted, or damaged.
Examine the overdrive and direct clutch discs and
plates (Fig. 34). Replace the discs if the facing is worn, severely scored, or burned and flaking off. Re­
place the clutch plates if worn, heavily scored, or cracked. Check the lugs on the clutch plates for
wear. The plates should slide freely in the drum. Re­ place the plates or drum if binding occurs.
Governor
Components

Check condition of the annulus gear, direct clutch

hub,
clutch drum and clutch spring (Fig. 34). Replace
the gear, hub and drum if worn or damaged. Replace
the spring if collapsed, distorted, or cracked.
Be sure the splines and lugs on the gear, drum and
hub are in good condition. The clutch plates and discs should slide freely in these components.
Inspect the thrust bearings and spring plate (Fig.

34).
Replace the plate if worn or scored. Replace the
bearings if rough, noisy, brinneled, or worn. Inspect the planetery gear assembly and the sun
gear and bushings (Fig. 34). If either the sun gear or
the bushings are damaged, replace the gear and
bushings as an assembly. The gear and bushings are
not serviced separately. The planetary carrier and pinions must be in good
condition. Also be sure the pinion pins are secure
and in good condition. Replace the carrier if worn or
damaged. Inspect the overrunning clutch and race. The race
surface should be smooth and free of scores. Replace
the overrunning clutch assembly or the race if either assembly is worn or damaged in any way. Inspect the output shaft and governor components
(Fig. 36). Replace the shaft pilot bushing and inner
bushing if damaged. Replace either shaft bearing if rough or noisy. Replace the bearing snap rings if dis­
torted or cracked.

•

OVERDRIVE
UNIT
OVERHAUL—42RH/46RH
21 - 333 Check the machined surfaces on the output shaft.
These surfaces should clean and smooth. Very minor nicks or scratches can be smoothed with crocus cloth.
Replace the shaft if worn, scored or damaged in any
way.
Check condition of the governor components. Re­
place the governor drive seal rings if damaged. Be sure the drive ring grooves are in good condition. Check operation of the governor valve, weights and
shaft. The valves and weights should slide freely in
the governor body (Fig. 36).
There are two governor component changes in
current overdrive unit units. The first involves
the governor valve which is now made of alumi­
num. The second involves the output shaft which has a spotface for governor valve end
clearance. The new aluminum valve is not inter­
changeable. It must only be used with an output
shaft that has the spotface for valve end clear­ ance.
Inspect the governor support and the two oil pres­
sure tubes (Fig. 36). The tubes are an integral
part of the support. Do not attempt to remove
them.
The oil tubes must not be pinched, kinked, col­
lapsed, or distorted. Blow them out with compressed
air to be sure they are clear. The tubes are designed
to be a slip fit in the piston retainer boss. Do not modify the tube ends in an effort to make them fit
tighter.
Replace the governor support and the oil tubes as
an assembly if either component is damaged.
Check condition of the governor valve and weight
snap rings. Replace any snap ring that appears bent
or distorted. Replace any snap ring if its condition is
doubtful.
Inspect the output shaft bushings (Fig. 37). The
small bushing is the intermediate shaft pilot bush­
ing. The large bushing is the overrunning clutch hub
bushing. Replace either bushing if scored, pitted, cracked, or worn.
The bushings can be removed with "blind hole
puller tools" such as Snap-On set CG40CB for small
bushings and set CG46 for large bushings. New
bushings can be installed with tools from an all pur­
pose installer kit such as the Snap-On A257 bushing driver set.

OVERDRIVE
GEARTRAIN
ASSEMBLY
(1) Lubricate geartrain components with Mopar
ATF Plus or Dexron II™ transmission fluid. (2) Soak direct and overdrive clutch discs in trans­
mission fluid before installation. (3) Install new pilot bushing and clutch hub bush­
ing in output shaft if necessary (Fig. 37). Lubricate
new (or old) bushings with petroleum jelly. (4) Install front bearing and bearing snap ring on
output shaft (Fig. 38)
Fig.
37 Output Shaft
Bushing
Location
(5) Align and install annulus gear on output shaft
(Fig. 38). (6) Install annulus snap ring (Fig. 38).

Fig.
38 Installing
Annulus
Gear And
Snap Ring

(7) Align and install clutch drum on annulus gear
(Fig. 39). Be sure drum is engaged in annulus gear

lugs.

(8) Install clutch drum outer retaining ring (Fig.

31).
(9) Slide clutch drum forward and install inner re­
taining ring (Fig. 39).
(10) Install overrunning clutch on hub (Fig. 40).
Note that clutch only fits one way. Shoulder on
clutch should seat in small recess at edge of

hub.

(11) Install thrust bearing on overrunning clutch
hub (Fig. 41). Use generous amount of petroleum
jelly to hold bearing in place for installation. Bear­ ing fits one way only. Be sure bearing is seated squarely against hub. Reinstall bearing if it does
not seat squarely.

21
- 334
OVERDRIVE
UNIT
OVERHAUL—42RH/46RH

•

INNER
RETAINING RING ANNULUS

GEAR

J9121-294

Fig.
39 installing
Clutch
Drum
Inner
Retaining
Ring

CLUTCH HUB OVERRUNNING
CLUTCH
J9121-322

Fig.
40
Assembling
Overrunning
Clutch
And Hub
BE
SURE

THRUST
BEARING

IS
SEATED SQUARELY
AGAINST CLUTCH
HUB

CLUTCH HUB

J9121-323
Fig.
41 Installing Overrunning
Clutch
Thrust

Bearing
(12) Install overrunning clutch (Fig. 42). Insert
snap
ring
pliers in hub splines. Expand pliers to grip

hub.
Then install assembly with counterclockwise, twisting motion.
CLUTCH
DRUM OVERRUNNING
CLUTCH

ASSEMBLY

EXPAN DING-TYPE
SNAP
RING
PLIERS

OVERRUNNING
CLUTCH ASSEMBLY
SEATED
IN

OUTPUT
SHAFT
CLUTCH DRUM
ANNULUS
GEAR

J9121-314

Fig.
42 Installing Overrunning
Clutch
(13) Install planetary gear in annulus gear (Fig.

43).
Be sure planetary pinions are fully seated in annulus gear before proceeding.
PLANETARY

GEAR

ANNULUS
GEAR

J9121-324
Fig.
43 Installing Planetary Gear

•

OVERDRIVE
UNIT
OVERHAUL—42RH/46RH
21 - 335 (14) Install direct clutch spring plate on sun gear.
Shoulder side of plate should face outward and to­
ward front. Then secure plate to sun gear with snap
ring (Fig. 44).
SUN

Fig.
44 Sun Gear And
Spring
Plate
Assembly
(15) Coat planetary thrust bearing and bearing
contact surface of spring plate with generous amount
of petroleum jelly. This will help hold bearing in
place during installation.
(16) Install planetary thrust bearing on sun gear
(Fig. 45). Slide bearing onto gear and seat it against
spring plate as shown. Bearing fits one way only.
If it does not seat squarely against spring plate,
remove and reposition bearing.

J9121-326

Fig.
45 Installing Planetary Thrust Bearing
(17) Install assembled sun gear, spring plate and
thrust bearing (Fig. 46). Be sure sun gear and thrust
bearing are fully seated before proceeding.
(18) Align splines in hubs of planetary gear and
overrunning clutch with Alignment tool 6227-2 (Fig.

47).
Insert tool through sun gear and into splines of
both hubs. Be sure alignment tool is fully seated be­ fore proceeding.
Fig.
46 Sun Gear
Installation

(19) Install direct clutch spring. Be sure spring is
properly seated on spring plate (Fig. 47).
Fig.
47 Installing Direct
Clutch
Spring

(20) Assemble direct clutch pack for installation on
hub (Fig. 48).
(21) Install direct clutch reaction plate on clutch

hub.
Note that one side of reaction plate is coun- terbored. Be sure this side faces rearward. Splines at rear of hub are raised slightly. Coun-
terbore in plate fits over raised splines. Plate should be flush with this end of hub (Fig. 49).
(22) Install remainder of direct clutch components
as follows: (a) Install first clutch disc on reaction plate fol­
lowed by a steel plate.
(b) Install remaining discs and plates alternately
until required number of discs and plates are in­ stalled.