1988 PONTIAC FIERO Service Repair Manual

700.R4-6 AUTOMATIC TRANSMISSION
ILL. NO. DESCRIPTION
13 RING, SERVO COVER RETAINING
14 SEAL, "0" RING (2-4
SERVO COVER)
15 COVER, 2-4 SERVO
16 PISTON, 4TH APPLY 17 RING, OIL SEAL (4TH APPLY PISTON)
(OUTER)
18 RING, RETAINER (APPLY PIN)
19 WASHER, SERVO APPLY PIN
20 SPRING, SERVO APPLY PIN
21 SEAL,
"0" RING 22 HOUSING, SERVO PISTON (INNER) 23 RING, OIL SEAL (2ND APPLY PISTON)
(INNER)
24 RING, OIL SEAL
(2ND APPLY PISTON)
(OUTER)
25 PISTON, 2ND APPLY
26 SPRING, SERVO CUSHION
27 RETAINER, SERVO CUSHION SPRING
28 RING, RETAINER
(2ND APPLY PISTON)
29 PIN, 2ND APPLY PISTON 31 SPRING, SERVO RETURN
JH0058-700R4
Figure 72 Servo Assembly Figure
73 Second
Servo Piston Retaining Ring
Removal
A. WHITE LINE B GAGE SLOT
PIN IS PRESET AT FACTORY AND MUST NOT BE
I I 2-4 SERVO PIN SELECTION I I
I I PIN LENGTH 1 PIN I.D. 11
Figure 74 Servo Pin Length
Transmission End Play Check
As a diagnostic aid transmission end play should
be checked prior to removing the internal parts. If the
end play is not within specifications you should watch
for possible worn or misassembled parts during
disassembly.
Tighten (Figures 84 and 85)
TOOLS REQUIRED:
J-24773-A Oil Pump Remover
5-25022-A End Play Adaptor (245 mm)
5-34725 End Play Adaptor (298 mm)
5-25025-7A Post
Dial Indicator
1. Remove an oil pump bolt (5) and install a 278 mm
(11 in.) bolt and locknut or J-25025-7A.

1 SOME MODELS 1 ILL.
NO. DESCRIPTION
10 CASE, TRANSMISSION
1 35 SEAL, CASE EXTENSION TO CASE
36 EXTENSION, CASE
37 BOLT,
CASE EXTENSION TO CASE
39 SEAL ASSEMBLY, CASE EXTENSION OIL
40 RETAINER, SPEEDO
DRIVEN GEAR FITTING
41 BOLT
& WASHER ASSEMBLY
42 SEAL,
"0" RlNG (SPEEDO FITTING TO
CASE EXTENSION)
43 FITTING ASSEMBLY, SPEEDO DRIVEN GEAI
44 GEAR, SPEEDO DRIVEN
45 GOVERNOR ASSEMBLY
46 COVER, GOVERNOR
99 SPEED SENSOR, INTERNAL
TRANSMISSIOI 100 BOLT, SPEEDO SENSOR RETAINING
687 SHAFT, OUTPUT
688 CLIP, SPEEDO DRIVE GEAR
689 GEAR, SPEEDO DRIVE
690 SLEEVE, OUTPUT SHAFT NOT USED ON
691 SEAL, OUTPUT SHAFT ALL MODELS
Figure 75 Extension and Associated Parts
2. Install J-25022-A or J-34725 as shown.
3. Install J-24773-A as shown.
4. Install dial indicator.
- set to zero
- pull up on J-24773-A
- end play should be 0.13/0.92 mm (.005/.
036 in.).
Oil Pump Assembly
Remove or Disconnect (Figures 88 and 89)
TOOLS REQUIRED:
J-24773-A Oil Pump Remover
1. "0" ring seal (6 18)
2.
All oil pump bolts (5) and washers (6)
3.
Oil pump assembly (7) with J-24773-A
4. Oil pump to case seal (8) and gasket (9)
AUTOMATIC TRANSMISSION 700-R4-7
ILL.
NO. DESCRIPTION
10 CASE, TRANSMISSION
33 CONNECTOR, ELECTRICAL
34 SEAL,
"0" RlNG (ELECTRICAL CONNECTION)
49 SEAL,
"0" RlNG (SOLENOID)
50 SOLENOID ASSEMBLY
51 BOLT, HEX WASHER HEAD (SOLENOID)
56 PLATE. VALVE BODY SPACER
/ 67 VALVE' ASSEMBLY, CONTROL BODY
70 SEAL, FILTER
1 71 FILTER ASSEMBLY, TRANSMISSION OIL
72 GASKET, TRANSMISSION OIL PAN
73 PAN, TRANSMISSION OIL
74 SCREW, SPEC. HEX WASHER HEAD (PAN)
87 CLIP, FILTER RETAINER
88 GASKET, SPACER PLATE TO CASE
89 GASKET, SPACER PLATE TO VALVE BODY
93 MAGNET, CHIP COLLECTOR
96 TUBE, AUXILIARY ACCUMULATOR VALVE
377 AUXILIARY ACCUMULATOR VALVE
BODY ASSEMBLY
Figure 76 Case and Attaching Parts
5. Reverse input clutch to oil pump thrust washer
(60 1)

700-R4-8 AUTOMATIC TRANSMISSION
DESCRIPTION
52 PISTON, 3-4 ACCUMULATOR
53 RING,
OIL SEAL (3-4 ACCUMULATOR PISTON)
54 SPRING, 3-4 ACCUMULATOR
56 PLATE, VALVE BODY SPACER
59 SPRING, 1-2 ACCUMULATOR (CONICAL) 60 RING, OIL SEAL (1-2 ACCUM. PISTON) 61 PISTON, 1-2 ACCUMULATOR
Figure 77 Accumulator Assembly
A WASHER WlRE RETAINER
50 SOLENOID ASSEMBLY
51 BOLT, HEX WASHER HEAD (SOLENOID)
63 BOLT, ACCUMULATOR COVER
66 CLIP, ELECTRICAL WlRE
69 BOLT, VALVE BODY
75 BOLT, MANUAL DETENT SPRING
87 CLIP, FILTER RETAINER
92 CONDUIT, SOLENOID WlRE
374 BOLT, SPEC. HEX WASHER HEAD
(M6
X 1 X 18)
375 BOLT, HEX HEAD (M6 X 1 X 35) 376 BOLT, HEX HEAD (M6 X 1 X 45) JH0064-700-R4
Figure 78 Valve Body Bolt Locations 64
LINK, THROTTLE LEVER
TO CABLE
65 LEVER & BRACKET ASSEMBLY, THROTTLE
69 BOLTS, CONTROL VALVE
ASSEMBLY
JH0065-700R4
Figure 79 T.V. Lever and Bracket
MANUAL VALVE
INNER DETENT LEVER
MANUAL VALVE
LINK MANUAL DETENT
SPRING ASSEMBLY JHOO66-7OOR4
Figure 80 Manual Valve Link
2-4 Band Reverse input Clutch, lnput Clutch and
lnput Gear Set (Figures
88,89 and 90)
1. Reverse input clutch (605) and input clutch (62)
together
- (grasp the turbine shaft and lift)
2. Band assembly pin (48)
3. The 2-4 band assembly (602)
4. Input sun gear (658)
Install or Connect (Figure 91)
TOOLS REQUIRED:
J-29837 Output Shaft Support Fixture
e J-29837 as shown
Important
e Output shaft (687) may fall free when input
carrier retaining ring (661) is removed if
J-2983'7 is not used.

AUTOMATIC TRANSMISSION 700-R4-9
NO. DESCRIPTION
A WASHER, WIRE RETAINING
33 CONNECTOR, ELECTRICAL
96 TUBE, AUXILIARY ACCUMULATOR VALVE
97 CLAMP, TUBE
374 BOLT, SPECIAL HEX HEAD (M6 X 1 X 16)
375 BOLT, HEX HEAD (M6 X
1 X 35) 376 BOLT, HEX HEAD (M6 X 1 X 45) 377 AUXILIARY ACCUM. VALVE BODY ASM.
71 0 BRACKET, PARKING LOCK
71 5 BOLT, PARKING LOCK BRACKET
JH0067-700R4
Figure 8 1 Removing Auxiliary Valve Body Assembly
55A #2 CHECKBALL (3RD CLUTCH ACCUM.) 558 #I 2 CHECKBALL (FORWARD CLUTCH)
55C #6 CHECKBALL (DRIVE 3) 9 1 #I 0 CHECKBALL (T.V. EXHAUST)
359 CUP PLUG - ORIFICE
ILL.
NO. DESCRlPTlON
47A GOVERNOR FILTER LOCATION
478 CONVERTER CLUTCH FILTER LOCATION
55E #4 CHECK BALL (3-4 CLUTCHl3-2 EX.)
55F
#8 CHECK BALL (2NDl1-2) 55G #I CHECK BALL (4TH ACCUMULATOR)
55H
#3 CHECK BALL (PART THROTTLEIDRIVE 3) 106 RETAINER & BALL ASM. (DOUBLE ORIFICE)
JH0069-700R4-R1
Figure 83 Case Checkballs and Filters
A 298mm TURBINE SHAFT
B 245mm TURBINE SHAFT
Figure
82 Valve Body Checkballs Figure 84 End
Play Tool

700-R4-10 AUTOMATIC TRANSMISSION
1 DIAL INDICATOR
2
278rnm (1 1") BOLT
3 LOCKNUT
Figure 85 End Play Check
Remove or Disconnect (Figures 86,87 and 90)
TOOLS REQUIRED:
J-34627 Snap Ring Pliers
1. Input
carrier to output shaft retaining ring (661)
with
5-34627. Do not overexpand the ring.
2. Input carrier assembly (662)
3. J-29837
and output shaft (687)
lmportant
a The manufacturer assembles the output
shaft and reaction internal gear with
adhesive for ease of assembly. If these parts
have not become separated during use, the
output shaft will come out later along with
the reaction internal gear.
4. Thrust bearing assembly (663)
Reaction Gear Set
Remove or Disconnect (Figures 86.87.92)
1. Input internal gear (664) and reaction carrier
(666)
2. Reaction
sun shell (670) and thrust washer (669)
3. Reaction
sun shell to inner race thrust washer
(674)
4. Lo and reverse support to case retainer ring (676)
5. Lo and reverse clutch support retainer spring
(680)
6. Reaction sun gear (673)
7. Lo and reverse inner race
(675), roller assembly
(678), support assembly (679), and reaction
carrier assembly (68 1)
8. Lo and reverse clutch plates (682)
9. Reaction internal
gear (684) and thrust bearing
assembly (683)
10. Reaction
gear support to case bearing (692)
Lo and Reverse Clutch Parts
Remove or Disconnect (Figures 92,93 and 94)
TOOLS REQUIRED:
J-23327 Clutch Spring Compressor 1.
Bolts (715) and parking lock bracket (710)
Important
r Due to interference, the parking pawl may
have to be removed before removing or
installing the low and reverse piston.
2. Parking pawl shaft plug (713) with a
#4 screw
extractor
3. Parking pawl pivot shaft (712) with a magnet
4. Parking pawl (71 1) and return spring (714)
5. Install tool J-23327.
6. Lo
and reverse clutch retainer ring (693)
7. Lo
and reverse clutch spring assembly (694)
8. Lo and reverse clutch piston (695)
- by application of air pressure in the case
apply passage
COMPONENT REPAIR AND
TRANSMISSION REASSEMBLY
Inner Manual Linkage
Remove or Disconnect (Figure 94)
1. Inside manual shaft nut (702)
2. Manual shaft
(707) and manual shaft retainer
(706)
3. Parking
lock actuator assembly (701) and inside
detent lever (703)
Manual Shaft Seal Replacement
Remove or Disconnect (Figure 95)
a Manual shaft seal (708)
- pry out with a screwdriver
Install or Connect
Tap a new seal in place
- use a 14 mm socket
Inspect (Figures 94 and 95)
a Actuator rod (701) for damage
a Inside detent lever (703) for damage or cracks
e Manual shaft (707) for damage or burrs
Manual detent spring
assemby (709) for roller
freeness or damage
lnstall or Connect (Figure 94)
a Parking lock actuator (701) onto inside detent
lever (703)
a Manual shaft (707) into case (10) and inside
detent lever (703)
a Inside manual shaft nut (702) onto manual shaft
(707)
- torque to 31 N-m (23 ft. lbs.)
r Manual shaft retainer (706) onto manual shaft
(707)

Figure 86 Transmission Internal Parts

700-R4-12 AUTOMATIC TRANSMISSION
ILL.
I NO. DESCRIPTION
601 WASHER, THRUST (PUMP TO DRUM)
602 BAND ASSEMBLY, 2-4
603 BUSHING, REVERSE INPUT CL. (FRONT)
605 HOUSING
& DRUM ASSEMBLY, REVERSE
INPUT CLUTCH
606 BUSHING, REVERSE INPUT CLUTCH (REAR)
607 PISTON ASM., REVERSE INPUT CLUTCH
608 SEALS, REVERSE INPUT CLUTCH
(INNER
& OUTER)
609 SPRING ASM., REVERSE INPUT CLUTCH
610 RING, REVERSE INPUT CLUTCH SPRING
RETAINER
61 1 PLATE. REVERSE INPUT CLUTCH
(BELLEVILLEI
612 PLATE ASM., REVERSE INPUT CLUTCH
613 PLATE, REVERSE INPUT CLUTCH BACKING
(SELECTIVE)
614 RING, REVERSE INPUT CL. RETAINING
61 5 BEARING ASSEMBLY, STATOR
SHAFT1
SELECTIVE WASHER
61 6 WASHER, THRUST (SELECTIVE)
617 RETAINER
& BALL ASM., CHECK VALVE
61 8 SEAL, "0" RlNG (TURBINE SHAFT/
SELECTIVE WASHER)
61 9 RING, OIL SEAL (SOLID)
620 RETAINER
& CHECK BALL ASSEMBLY
621 HOUSING & SHAFT ASSEMBLY, INPUT
622 SEAL, "0" RlNG INPUT TO FORWARD HSG.
623 PISTON, 3RD
& 4TH CLUTCH
624 SEAL, 3RD & 4TH CL. (INNER & OUTER)
625 RING, 3RD
& 4TH CLUTCH APPLY
626 SPRING ASSEMBLY, 3RD & 4TH CLUTCH
627 RETAINER & BALL ASSEMBLY, FORWARD
CLUTCH HOUSING
628 HOUSING, FORWARD CLUTCH
629 SEAL, FORWARD CLUTCH (INNER
& OUTER)
630 PISTON, FORWARD CLUTCH
631 SEAL, OVERRUN CLUTCH (INNER
& OUTER)
632 PISTON, OVERRUN CLUTCH
633 BALL, OVERRUN CLUTCH
634 SPRING ASSEMBLY, OVERRUN CLUTCH
635 SNAP RING, OVERRUN CLUTCH SPRING
RETAINER
636 SEAL, INPUT HOUSING TO OUTPUT SHAFT
637 BEARING ASSEMBLY, INPUT SUN GEAR
638 SNAP RING, OVERRUN CL. HUB RETAINING
639 HUB, OVERRUN CLUTCH
641 RETAINER
& RACE ASSEMBLY, SPRAG
642 FORWARD SPRAG ASSEMBLY
643 RETAINER RINGS, SPRAG ASSEMBLY
644 RACE, FORWARD CLUTCH (OUTER)
645 PLATE ASSEMBLY, OVERRUN CLUTCH
646 PLATE, FORWARD CLUTCH APPLY
648 PLATE, FORWARD CLUTCH (WAVED)
649 PLATE ASSEMBLY, FORWARD CLUTCH
650 PLATE. FORWARD CLUTCH BACKING
(SEL.) 651 RING, FORWARD CLUTCH BACKING PLATE I RETAINER
I
. . - . . . . . . - . .
652 PLATE, 3RD & 4TH CLUTCH RlNG RETAINER
653 PLATE, 3RD & 4TH CLUTCH APPLY
(STEPPED)
654 PLATE ASSEMBLY, 3RD
& 4TH CLUTCH
655 PLATE, 3RD & 4TH CLUTCH BACKING (SEL.)
ILL.
NO. DESCRIPTION
656 RING, 3RD & 4TH CLUTCH BACKING
PLATE RETAINER
657 BUSHING, INPUT SUN GEAR (FRONT)
658 GEAR, INPUT SUN
659 BUSHING, INPUT SUN GEAR (REAR)
661 RET., OUTPUT SHAFT TO INPUT CARRIER
662 CARRIER ASSEMBLY, INPUT (COMPLETE)
663 BEARING ASSEMBLY, THRUST (INPUT
CARRIER TO REACTION SHAFT)
664 GEAR, INPUT INTERNAL
665 BUSHING, REACTION CARRIER SHAFT
(FRONT)
666 SHAFT, REACTION CARRIER
667 BUSHING, REACTION CARRIER SHAFT
(REAR)
668 RING, REACTION
SHAFTIINTERNAL GEAR
RETAINER
669 WASHER, THRUST (REACTION
SHAFT1 SHELL)
670 SHELL, REACTION SUN
671 RING, REACTION SUN GEAR RETAINER
672 BUSHING, REACTION SUN
673 GEAR, REACTION SUN
674 WASHER, THRUST
(RACE/REACTION SHELL)
675 RACE, LO & REVERSE ROLLER CLUTCH
676 RING, LO & REVERSE SUPPORT TO CASE
RETAINER
677 RING, LO
& REVERSE RETAINER (ROLLER
ASSEMBLYICAM)
678 CLUTCH ASSEMBLY, LO & REVERSE ROLLER
679 SUPPORT ASM., LO & REVERSE CLUTCH
680 SPRING, TRANSMISSION (LO & REVERSE
CLUTCH SUPPORT RETAINER)
681 CARRIER ASSEMBLY, REACTION
682 PLATE ASSEMBLY, LO
& REVERSE CLUTCH
682A PLATE, LO & REVERSE CLUTCH (WAVED)
682B PLATE, SPACER LO
& REV. CL. (SELECTIVE)
683 BEARING ASSEMBLY, THRUST (REACTION
CARRIERISUPPORT)
684 GEAR, INTERNAL REACTION
685 SUPPORT, INTERNAL REACTION GEAR
686 RING, REACTION
GEARISUPPORT RETAINER
687 SHAFT, OUTPUT
688 CLIP, SPEEDO DRIVE GEAR
689 GEAR, SPEEDO DRIVE
690 SLEEVE, OUTPUT SHAFT
691 SEAL, OUTPUT SHAFT
692 BRG., REACTION GEAR SUPPORT TO CASE
693 RING, LO
& REVERSE CLUTCH RETAINER
694 SPRING ASSEMBLY, LO & REVERSE CLUTCH
695 PISTON,
LO & REVERSE CLUTCH
696 SEAL,
TRANSMISSION (LO & REVERSE
CLUTCH - OUTER, CENTER, INNER)
697 DEFLECTOR, OIL (HIGH OUTPUT
MODELS ONLY)
698 PLUG.
ORIFICED CUP
699 ROTOR, INTERNAL TRANSMISSION SPEED
SENSOR
Figure

AUTOMAnIC TRANSMISSION 700-R4-13
I REMOVED BEFORE OIL PUMP REMOVAL I
Figure 88 Oil Pump Removal
Case
Inspect (Figures 96.97 and 98)
Case (10) exterior for cracks or porosity
Case to valve body face for damage,
interconnected oil passages and flatness
- the face flatness can be checked by
inspecting the spacer plate to case gasket for
proper land impressions.
Vent assembly (1
1) for damage
Air check all oil passages.
- see diagnosis section for oil passage
identification.
2-4 servo bore for
- damage, porosity, or burrs - any sharp edges (i.e. - oil passages, slots for
retaining ring removal
- remove if found)
Orifice cup plug (86) in servo bore for debris or
damage
Third accumulator bore for
- porosity, damage, or burrs
- pin damage (77) - orifice cup plug (81) damaged or plugged
Speedometer bore
- damaged
- sharp edges
- porosity
All bolt holes for thread damage
- Heli-coil to repair
Cooler connectors
(12) for
- damage - proper torque 38 N.m (28 ft. lbs.)
Case interior for
- damaged ring grooves or casting flash - clutch plate lugs worn or damaged
- bushing (76) scored, worn, or damaged (see
Bushing Replacement)
- governor support pin installation depth.
(Incorrect
installation depth will cause
governor driven gear
clamage and shift
problems.)
NO. DESCRIPTION
5 BOLT, PUMP TO CASE
6 WASHER, PUMP TO CASE BOLT
7 PUMP ASSEMBLY, OIL
8 SEAL, OIL (PUMP TO CASE)
9 GASKET, PUMP COVER TO CASE
10 CASE, TRANSMISSION
601 WASHER, THRUST (PUMP TO DRUM)
605 HOUSING
& DRUM ASSEMBLY, REVERSE
INPUT CLUTCH
621 HOUSING &SHAFT ASSEMBLY, INPUT
JH0075-700R4
Figure 89 Input Clutch Removal