1993 DODGE TRUCK Service Repair Manual

21
- 224
TRANSMISSION
OVERHAUL—36RH/37RH

• Throttle
Pressure
Adjustment
Insert Gauge Tool
C-3763
between the throttle le­
ver cam and the kickdown valve stem (Fig. 102).
Push the gauge tool inward to compress the kick-
down valve against the spring and bottom the throt­
tle valve. Maintain pressure against kickdown valve spring.
Turn throttle lever stop screw until the screw head
touches throttle lever tang and the throttle lever cam
touches gauge tool. The kickdown valve spring must be fully com­
pressed and the kickdown valve completely bot­
tomed to obtain correct adjustment.

HEX

WRENCH
THROTTLE

LEVER
SPECIAL

TOOL
C-3763
J9121-542

Fig.
102
Throttle
Pressure
Adjustment—36RH/37RH

TRANSMISSION
ASSEMBLY
AND
ADJUSTMENT

ASSEMBLY
TIPS
Do not allow dirt, grease, or foreign material to en­
ter the case or transmission components during as­ sembly.
Keep the transmission case and components clean.
Also make sure the tools and workbench area used
for reassembly operations are equally clean.
Shop towels used for wiping off tools and your
hands must be made from lint free materials. Lint
will adhere to transmission parts and could interfere
with valve operation or even restrict fluid passages.
Lubricate transmission clutch and gear components
with Mopar ATF Plus, type 7176 transmission fluid
during reassembly. This is the preferred fluid for use in 36RH/37RH transmissions. Use Mopar Dexron II
only when ATF Plus is not readily available.
Use Ru-Glyde, or Door-Eze, or petroleum jelly on
seals and O-rings to ease installation. Petroleum
jelly can also be used to hold thrust washers and plates in position during assembly operations. How­ever, do not use chassis grease, bearing grease,
white grease, or similar lubricants on any part.
These types of lubricants can eventually block or re­ strict fluid passages and valve operation.
Do not force parts into place. Most of the transmis­
sion components/sub-assemblies are easily installed
by hand. If a part seems difficult to install, it is ei­ ther misaligned or incorrectly assembled. Verify that thrust washers, thrust plates and seal rings are cor­
rectly positioned. These parts will prevent proper as­
sembly is mispositioned (or "left out" by accident. The planetary geartrain, front/rear clutch assem­
blies and oil pump are all much easier to install
when the transmission case is upright or as close to
this position as possible. Either tilt the case upward
with wood blocks, or cut a hole in the bench large enough for the output shaft and rear support. Then lower the shaft and support into the hole and support
the rear of the case directly on the bench.

Assembly
Procedure
(1) Lubricate rear servo piston seal with petroleum
jelly, Ru-Glyde, or Door Eze. Lubricate servo bore in case with transmission fluid. (2) Install rear servo piston in case. Position piston
at slight angle to bore and insert piston with twist­
ing motion (Fig. 103).
REAR

SERVO

PISTON

J9121-87>

Fig.
103 Installing Rear
Servo
Piston—36RH/37RH
(3) Install rear servo spring and retainer in case
bore (Fig. 104). Be sure spring is seated on piston.

SPRING

RETAINER

v-'
J9121-88

Fig.
104 Installing Rear
Servo
Piston
Spring
And Retainer-36RH/37RH

•

TRANSMISSION
OVERHAUL—36RH/37RH
21 - 225 (4) Compress rear servo piston with C-clamp or
Valve Spring Compressor C-3422-B and install servo
piston snap ring (Fig. 105).
Fig.
105 Installing Rear
Servo
Snap
Ring—36RH/

37RH (5) Install overrunning clutch cam, springs, rollers,
race and rear support if not yet installed. Refer to in­ stallation procedure in Subassembly Overhaul sec­
tion.
(6) Position rear band and link in case (Fig. 106).
Be sure notched side of link faces away from
band.

Fig.
106 Installing Rear
Band
And
Link—36RH/37RH
(7) Install low-reverse drum (Fig. 107). Slide drum
through rear band, onto rear support hub and into engagement with overrunning clutch race.
Fig.
107 Installing
Low-Reverse
Drum—36RH/37RH

(8) Install snap ring that secures low-reverse drum
to rear support hub (Fig. 108).

Fig.
108 Installing
Low-Reverse
Drum
Snap
Ring—36RH/37RH

(9) Install new O-rings on band reaction pin. Lu­
bricate pin and O-rings. Then insert pin into case and part way into band link (Fig. 109).
(10) Install rear band adjusting lever, strut and re­
action lever (Fig. 110). Be sure levers and strut are
aligned and engaged before seating band reaction pin
in case.

21
- 226
TRANSMISSION
OVERHAUL—36RH/37RH

•

REACTION PIN
O-RINGS
J9121-91

Fig.
109 Installing Rear
Band
Reaction
Pin—36RH/
37RH

ADJUSTING
SCREW
ADJUSTING

LEVER

REACTION LEVER
•STRUT

J9121-92

Fig.
110 Rear
Band
Levers
And Strut—36RH/37RH (11) Lubricate front servo piston components and
servo bore in case with transmission fluid.
(12) Install front servo piston in bore. Carefully
"run" small, suitable tool around piston ring to press
it back into groove and ease installation (Fig. 111).
Rotate piston into bore at same time. Rock piston
slightly to ease piston ring past snap ring groove and
into bore.
(13) Bottom front servo piston in bore and install
servo spring.
(14) Install front servo piston rod guide as follows: (a) Place Tool SP-5560 (or similar size tool) on
guide to serve as press tool for C-clamp. (b) Position C-clamp on press tool and case (Fig.

112).
USE
SUITABLE
TOOL

TO HELP SEAT PISTON RING

FRONT

SERVO

PISTON
-J9121-98

Fig.
111 Installing Front
Servo
Piston—36RH/37RH
(c) Slowly compress rod guide while simulta­
neously easing seal ring into bore with suitable
tool (tighten clamp screw with one hand and "run"
tool around guide ring with other hand). (15) Install rod guide snap ring (Fig. 112).

C-CLAMP
ROD
SMALL
GUIDE SCREWDRIVER
ROD

GUIDE
SNAP
RING

J9121-99"
Fig.
112 Installing Front
Servo
Rod
Guide
And
Snap

Ring—36RH/37RH

(16) Position front band lever in case and over
servo rod guide. Then install front band reaction pin
in case and slide it through lever.
(17) Coat threads of front band reaction pin access
plug with sealer and install it in case. Tighten plug to 17 Nnn (13 ft. lbs.) torque.
(18) Install assembled output shaft and planetary
gear components (Fig. 113). Support shaft care-

•
fully during Installation. Do not allow shaft
bearing/bushing surfaces to become nicked or
scratched. ASSEMBLY JY,iM^

Fig.
113 installing Output Shaft And Planetary Geartrain-36RH/37RH (19) Align and install governor/park gear assembly
on output shaft. Note that output shaft In current
transmission is spotfaced for governor valve end clearance (Fig. 114). Shaft must be indexed so
that small end of governor valve will seat in this spotface. Install governor body and park as fol­
lows to ensure proper alignment and operation.
(a) Rotate output shaft until spotface (at gover­
nor valve shaft hole) is facing upward (Fig. 114). (b) Position valve bore in governor body over
spotface on output shaft. Then align valve shaft
holes in governor body and output shaft.
(c) Align splines in output shaft and park gear

hub.
J9221-52
TRANSMISSION
OVERHAUL—36RH/37RH
21 - 227

Fig.
115 Installing
Governor
And
Park
Gear
Assembly-36RH/37RH
(d) Carefully push assembly into place in rear
support (Fig. 115).
(e) Verify that governor valve shaft holes in out­
put shaft and governor body are still in alignment. Reposition governor body and park gear if align­
ment is not correct.
(f) Tighten bolts attaching governor body to park
gear to 11 N-m (95 in. lbs.) torque. (20) Assemble and install governor valve and shaft
(Fig. 116). Be sure valve shaft operates freely be­
fore proceeding.
Fig.
114
Governor
Valve
And Output Shaft Spotface
Alignment-36RH/37RH
Fig.
116 Installing
Governor
Valve
And
Shaft-36RH/37RH

21 - 228
TRANSMISSION
OVERHAUL—36RH/37RH

• (21) Install E-clips that retain governor valve shaft
(Fig. 117). One clip is required at each end of shaft.
Fig.
117 Installing
Governor
Valve
Shaft

E-CIips-36RH/37RH
(22) Lubricate output shaft thrust plate with petro­
leum jelly and install plate on output shaft hub (Fig.
118).
Fig.
118 Installing Output Shaft Thrust Plate-36RH/ 37RH
(23) Check input shaft front seal rings, fiber thrust
washer and rear seal ring (Fig. 119). Be ends of rear seal ring are hooked together and diagonal cut ends
of front seal rings are firmly seated against each
other as shown. Lubricate seal rings with petroleum
jelly after checking them.
(24) Assemble front and rear clutches (Fig. 120).
Align lugs on front clutch discs. Mount front clutch
Fig.
119 Input Shaft
Seal
Ring
And Thrust
Washer

instaliation-36RH/37RH on rear clutch. Turn front clutch retainer back and
forth until front clutch discs are fully seated on rear clutch splined hub.

Fig.
120
Assembling
Front And Rear
Clutches~36RH/37RH

(25) Measure thickness of output shaft thrust
washer with micrometer. Record thickness for refer­ ence when checking input shaft end play.
(26) Install output shaft thrust washer in hub rear
clutch retainer (Fig. 121). Use petroleum jelly to hold

•
TRANSMISSION
OVERHAUL—36RH/37RH
21 - 229
washer in place. Position washer so grooves are
facing outward. Also note that washer only fits
one way in clutch retainer hub.

Fig.
121 Installing Output Shaft Thrust
Washer-36RH/37RH

(27) Slide front band onto driving shell but do not
install band strut or anchor at this time. (28) Place transmission case in upright position, or
place blocks under front end of transmission repair stand to tilt case rearward. This makes it easier to
install front/rear clutch assembly.
(29) Align discs in rear clutch. Then install and
engage assembly in front planetary and driving shell (Fig. 122). Turn clutch retainers back and forth until
both clutches are seated.
(30) Slide front band over front clutch retainer and
install front band strut and anchor (Fig. 123).
(31) Tighten front band adjusting screw until band
is tight on clutch retainer. Verify that front/rear
clutch assembly is still properly seated before tight­
ening band.
(32) Install oil pump Pilot Studs C-3288-B in case
(Fig. 124). (33) Install new oil pump gasket on pilot studs and
seat it in case. Be sure gasket is properly aligned
with fluid passages in case (Fig. 124). J9121-18
Fig.
123 Front
Band
Linkage
Installation—36RH/

37RH

21
- 230
TRANSMISSION
OWERHAUL-3IRH/37RH

•
J9121-103

Fig.
124 Installing Oil
Pump
Gasket
And Pilot
Studs-36RH/37RH
(34) Check seal rings on reaction shaft support. Be
sure rings are hooked together correctly. Also be sure
fiber thrust washer is in position (Fig. 125). Use pe­
troleum jelly to hold washer in place if necessary. J9121-104

Fig.
125 Reaction Shaft
Seal
Ring
And Thrust
Washer
Installation-36RH/37RH (35) Lubricate oil pump seals with petroleum jelly
or transmission fluid.
(36) Mount oil pump on pilot studs and slide pump
into case opening (Fig. 126). Work pump into case
by hand. Do not use a mallet or similar tools to seat pump.
(37) Remove pilot studs and install oil pump bolts.
Tighten pump bolts alternately and evenly to fully seat pump in case. Then final-tighten pump bolts to 20 Nnn (15 ft. lbs.) torque. SEAT
OIL PUMP IN
CASE
BY HAND
REMOVE
PILOT STUDS
WHEN PUMP IS SEATED J9121-105

Fig.
126 Oil
Pump
Installation-36RH/37RH (38) Verify correct assembly. Rotate input and out­
put shafts and check for bind. If bind exists, compo­ nents are either misassembled, or not seated. Disassemble and correct as necessary before proceed­
ing. (39) Check input shaft end play as follows: (a) Attach dial indicator to converter housing
(Fig. 127). Position indicator plunger against input
shaft and zero indicator. (b) Move input shaft in and out and record read­
ing. (c) End play should be 0.86 - 2.13 mm (0.034 -
0.084 in.). (d) If end play is incorrect, change output shaft
thrust washer, thrust plate, or front clutch thrust
f

RH278

Fig.
127
Measuring
Input Shaft End Play—36RH/
37RH

#
s ; _
TRANSMISSION
OWERHAUL—38RH/37RH
21 - 231
washer as needed. Thrust washer is select and
comes in three thicknesses.
(40) Install accumulator piston and spring (Fig.

128). Fig.
128 Installing
Accumulator
Piston
And

Spring-36RH/37RH
(41) Verify that park/neutral position switch has
not been installed in case. Valve body cannot be in­ stalled if switch is in position.
(42) Place valve body manual lever in low to move
park lock rod rearward.
(43) Position valve body on case and install valve
body bolts finger tight.
(44) Install park/neutral position switch in case.
Tighten switch to 34 Nnn (25 ft. lbs.) torque.
(45) Align valve body on case (Fig. 129). Tighten
valve body bolts alternately and evenly to 12 Nnn (105 in. lbs.) torque. Start at center and work out­
ward when tightening bolts. Do not overtighten
valve body bolts. This could result in distortion and cross leakage after installation..
Fig.
129 Installing
Valve
Body-36RH/37RH
(46) Install new filter on valve body (Fig. 130).
Tighten filter screws to 4 Nnn (35 in. lbs.).
Fig.
130 Installing
Valve
Body
Filter-36RH/37RH
(47) Install seal on park/neutral position switch
(Fig. 131). Then install and tighten switch to 34 Nnn
(25 ft. lbs.).
Fig.
131 Park/Neutral Position
Switch
Seal

Position-36RH/37RH
(48) Adjust front and rear band as follows:
(a) Loosen locknut on each band adjusting screw
4-5 turns. (b) Tighten both band adjusting screws to 8 Nnn
(72 in. lbs.).
(c) Back off front band adjusting screw 2-1/2

turns.

(d) Back off rear band adjusting screw 2 turns.
(e) Hold each adjusting screw in position and
tighten locknuts to 34 Nnn (25 ft. lbs.). Do not al­ low adjusting screws to turn when tightening lock-

nuts.

(49) Install magnet in oil pan. Magnet fits over
small protrusion at corner of pan. (50) Position new oil pan gasket on case and in­
stall oil pan. Tighten pan bolts to 17 Nnn (13 ft. lbs.).
(51) Install rear bearing and bearing snap rings on
output shaft. Be sure ring groove in bearing outer surface is toward front of transmission. (52) Position new extension housing gasket on rear
of transmission case. Use petroleum jelly to hold gas­
ket in place if necessary.