Chevrolet 1977 10 Series, Repair Manual, Page: 321 / 468

AUTOMATIC TRANSMISSIONS
(400)7A-1
SECTION 7 A
AUTOMATIC TRANSMISSION
TURBO HYDRA-MATIC 4 0 0 TRANSMISSION
INDEX
Transm ission Disassembly and R eassem bly................. 7A- 1
Disassembly of M ajor U n its........................................... 7A- 1
G overnor, Speedometer Driven Gear, Pan, Filter
and Intake P ip e .......................................................... 7A- 1
Control Valve Assembly, Solenoid Connector,
G overnor Pipes and Detent S pring ..................... 7A- 3
Rear Servo, Valve Body Spacer, Gasket
and Front S ervo ......................................................... 7A- 4
Rear Band Apply Pin S election................................ 7A- 5
M anual L inkage.........................................................
7A- 7
Rear Oil Seal and Case E xtension ............................. 7A- 9
Front U nit End Play Checking P ro ced u re............ 7A- 9
Oil Pum p and Internal Case C om ponents................ 7A -10
Rear End Play Checking P ro ced u re........................ 7 A -11
G ear U nit A ssem bly...................................................... 7A - 13
Speedometer Drive G ear............................................... 7A-15
Governor A ssem bly......................................................... 7A - 16
Driven G ear R eplacem ent.......................................... 7A-17
F ront Servo Parts Inspectio n ...................................... 7A-18
Rear Servo Parts Service.............................................. 7A-18
C ontrol Valve Service...................................................... 7A-19
Oil Pum p Service.............................................................. 7A-22
Forw ard Clutch Service................................................... 7A -24
Direct Clutch and Interm ediate Roller Service......... 7A-29
C enter Support Service.................................................... 7A-34
Reaction Carrier, Roller Clutch and O utput
C arrier Assembly...................................................... 7A- 38
Pinion R eplacem ent....................................................... 7A- 39
O utput Shaft, Rear Internal Gear,
Sun G ear and Shaft................................................. ....7A -40
Sun G ear Shaft B ushing-Front......................................7A -40
Sun G ear Shaft B ushing-R ear..................................... ..7A -40
Main Shaft Inspection...................................................... ..7A -40
Front and Rear Bands Inspection................................ ..7A -40
Case E xtension.................................................................. ..7A -40
M odulator and V alve....................................................... ..7A -41
M anual and Parking Linkage In sp ectio n ................... ..7A -41
Case Assembly In sp ectio n .............................................. ..7A -42
Case Assembly B ushing................................................ ..7A -42
Converter Inspection........................................................ ..7A -42
Converter End Clearance C heck................................ ..7A -44
Assembly of R ear U n it.....................................................7A -44
Case M odification-C orvette.............................................7A -46
Assembly of U nits to Transmission C ase................... ..7A-47
Install M anual Linkage............................................... ..7A -49
Rear Extension Assem bly...............................................7A - 51
Check Balls, F ront Servo, Spacer and Solenoid........7A - 51
Rear Servo A ssem bly.......................................................7A - 53
Control Valve Assembly and G overnor Pipes......... .7A -54
Filter and Intake Pipe.....................................................7A -55
M odulator Valve and Valve and Vacuum
Modulator ...................................................................... .7A-55
G overnor........................................................................... .7A-55
Speedometer Driven G e a r .............................................7A - 55
Converter A ssem bly-Installation................................ .7A - 56
Special T o o ls........................................................................ .7A -57
DISASSEMBLY OF MAJOR UNITS
1. W ith transmission in cradle on portable jack, remove
converter assembly by pulling straight out.
NOTE:
Converter contains a large am ount of oil.
2. Install holding Fixture J-8763-01 on transmission so
that m odulator assembly will be located on side of holding
fixture nearest bench (Fig 7A-2C).
NOTE:
D o not over-torque holding screw. ThiS will
bind center support.
3. Install fixture and transm ission into holding Tool
Base J-3289-14 with bottom pan facing up (Fig. 7A-2C).
4. Remove m odulator assembly attaching screw and
retainer (Fig. 7A-3C).
5. Remove vacuum m odulator assembly and "O" ring
seal from case (Fig. 7A-4C). D iscard "O" ring.
6. Remove m odulator valve from transm ission case (Fig.
7A-4C).
Removal of Governor,
Speedometer Driven Gear,
Pan, Filter and Intake Pipe
1. Remove attaching screws, governor cover and gasket
(Fig. 7A-5C). Discard gasket.