Automatic Transmission - GMC T Series 1994 Repair Manual

AUTOMATIC TRANSMISSION UNIT REPAIR
NOTICE:
When fasteners are removed, always reinstall them at the same location from which they were
removed. If a fastener needs to be replaced, use the correct part number fastener for that application. If the
correct part number is not available, a fastener of equal size and strength (or stronger) may be used. Fasteners
that are not reused, and those requiring thread locking compound will be called out. The correct torque value
must be used when installing fasteners that require it. If the above conditions are not followed, parts or system
damage could result.
Transmission Disassembly...................... .... 7A-14B-2
General Service Information............... .... 7A-14B-2
2-4 Servo A ssem bly............................. .... 7A-14B-2
Servo Pin Length.................................. .... 7A-14B-3
Speed Sensor and Case Extension..... .... 7A-14B-5
Pan and Filter A ssem bly...................... .... 7A-14B-6
Valve Body and Wiring H arness......... .... 7A-14B-6
Transmission End Play C h eck ............ .... 7A-14B-9
Oil Pump A ssem bly............................. .... 7A-14B-9
2-4 Band, Reverse Input Clutch,
Input Clutch and Input Gear S e t.... ...7A-14B-10
Reaction Gear S et.................................. ...7A-14B-11
Lo and Reverse Clutch P arts............... ...7A-14B-12
Inner Manual Linkage.......................... ...7A-14B-13
Manual Shaft Seal Replacem ent......... ...7A-14B-13
Component Repair and
Transmission Reassembly.................... ...7A-14B-14
Case A ssem bly...................................... ...7A-14B-14
C ase......................................................... ...7A-14B-14
Third Accumulator Retainer and
Ball A ssem bly................................... ...7A-14B-15
Retainer and Ball Assembly Leak
Check Procedure.............................. ...7A-14B-15
Replacement Procedure - Third Accumulator
Retainer and Ball Assembly............ ...7A-14B-15
Lo and Reverse Clutch Piston.............. ...7A-14B-16
Parking P a w l......................................... ...7A-14B-17
Reaction Internal Gear and
Carrier A ssem bly............................. ...7A-14B-17
Reaction Internal Gear and Support..,. ...7A-14B-18
Lo and Reverse Clutch Spacer Plate
Selection............................................ ...7A-14B-18
Lo and Reverse Clutch Support
Assembly........................................... ...7A-14B-21
Reaction Sun Gear and S h e ll.............. ...7A-14B-22
Input Internal Gear and
Reaction S haft.......................................7A-14B-22
Internal Transmission Speed Sensor
R o to r.................................................. ...7A-14B-23
SECTION 7A-14B
HYDRA-MATIC 4L60-E
RPO M30
CONTENTS
Input Internal Gear and Output Shaft.... 7A-14B-23
Input Carrier and Sun G ear........... .........7A-14B-24
Input Clutch Assembly.................. .........7A-14B-25
Check Valve Retainer and Ball Assembly -
Forward Clutch Sprag Assembly ...........7A-14B-32
Forward Clutch Piston Travel
3-4 Clutch Assembly...................... .........7A-14B-35
3-4 Clutch Piston Travel Check .... .........7A-14B-35
Clutch Air Check............................ .........7A-14B-35
Turbine Shaft S eals........................ .........7A-14B-36
Reverse Input Clutch A ssem bly.... .........7A-14B-37
Reverse Input Clutch Backing Plate
Reverse Input and Input Clutches ..........7A-14B-40
2-4 Band Assembly................................. 7A-14B-41
Oil Pump A ssem bly....................... .........7A-14B-41
Oil Pump Body............................... ......... 7A-14B-41
Oil Pump Cover (Disassemble).... .........7A-14B-42
Oil Pump Body (Assem ble)................... 7A-14B-44
Oil Pump Cover (Assemble).................. 7A-14B-44
Oil Pump Cover and B ody..................... 7A-14B-45
Transmission End Play C h eck ..... ......... 7A-14B-46
Valve Body and Associated P arts........... 7A-14B-49
Control Valve Assembly................ ......... 7A-14B-50
2-4 Servo A ssem bly................................ 7A-14B-55
Speed Sensor and Case Extension .........7A-14B-58
Torque Converter Assembly................... 7A-14B-59
Cross Section.................................. ......... 7A-14B-61
Disassembled Views.......................... ......... 7A-14B-62
Seal and Bearing Locations....................... 7A-14B-71
Bushing Locations............................. ......... 7A-14B-72
Torque Specifications................................. 7A-14B-73
Bushing Replacement
Procedure......................................... ......... 7A-14B-74
Special T ools...................................... ......... 7A-14B-78
Replacement Procedures........... .........7A-14B-26
C heck.......................................... .........7A-14B-34
Selection............................................... 7A-14B-39