Automatic Transmission
and Transaxle

For every task in Automatic Transmission and Transaxle, the following safety requirement must be strictly enforced:

Comply with personal and environmental safety practices associated with clothing; eye protection; hand tools; power equipment; proper ventilation; and the handling, storage, and disposal of chemicals/materials in accordance with local, state, and federal safety and environmental regulations.

NATEF Tasks	Description	Priority designation
A	General Transmission and Transaxle Diagnosis
II.A.1	Identify and interpret transmission concern; assure proper engine operation; determine necessary action.	P-1
II.A.2	Research applicable vehicle and service information, such as transmission/transaxle system operation, vehicle service history, service precautions, and technical service bulletins.	P-1
II.A.3	Locate and interpret vehicle and major component identification numbers (VIN, vehicle certification labels, and calibration decals).	P-1
II.A.4	Diagnose fluid usage, level, and condition concerns; determine necessary action.	P-1
II.A.5	Perform pressure tests; determine necessary action.	P-1
II.A.6	Perform stall test; determine necessary action.	P-2
II.A.7	Perform lock-up converter system tests; determine necessary action.	P-1
II.A.8	Diagnose electronic, mechanical, hydraulic, vacuum, control system concerns; determine necessary action.	P-1
II.A.9	Diagnose noise and vibration concerns; determine necessary action.	P-2
II.A.10	Diagnose transmission/transaxle gear reduction/multiplication concerns using driving, driven, and held member (power flow) principles.	P-1
B	Transmission and Transaxle Maintenance and Adjustment
II.B.1	Inspect, adjust or replace throttle valve (TV) linkages or cables; manual shift linkages or cables; transmission range sensor; check gear select indicator (as applicable)	P-1
II.B.2	Service transmission; perform visual inspection; replace fluids and filters.	P-1
C	In-Vehicle Transmission and Transaxle Repair
II.C.1	Inspect, adjust or replace (as applicable) vacuum modulator, inspect and repair or replace lines and hoses.	P-3
II.C.2	Inspect, repair and replace governor assembly.	P-3
II.C.3	Inspect and replace external seals and gaskets.	P-2
II.C.4	Inspect extension housing, bushings and seals; perform necessary action.	P-3
II.C.5	Inspect, leak test, flush, and replace cooler, lines, and fittings.	P-2
II.C.6	Inspect and replace speedometer drive gear, driven gear, vehicle speed sensor (VSS) and retainers.	P-2
II.C.7	Diagnose electronic transmission control systems using a scan tool; determine necessary action.	P-1
II.C.8	Inspect, replace, and align power-train mounts	P-2
D	Off-Vehicle Transmission and Transaxle Repair
	1. Removal, Disassembly, and Reinstallation
II.D.1.1	Remove and reinstall transmission and torque converter (rear-wheel drive).	P-2
II.D.1.2	Remove and reinstall transaxle and torque converter assembly.	P-1
II.D.1.3	Disassemble, clean, and inspect transmission/transaxle.	P-1
II.D.1.4	Inspect, measure, clean, and replace valve body (includes surfaces and bores, springs, valves, sleeves, retainers, brackets, check-balls, screens, spacers, and gaskets).	P-2
II.D.1.5	Inspect servo bore, piston, seals, pin, spring, and retainers, determine necessary action.	P-3
II.D.1.6	Inspect accumulator bore, piston, seals, spring, and retainer; determine necessary action.	P-3
II.D.1.7	Assemble transmission/transaxle.	P-1
	2. Oil Pump and Converter
II.D.2.1	Inspect converter flex plate, attaching parts, pilot, pump drive, and seal areas.	P-2
II.D.2.2	Measure torque converter endplay and check for interference, check stator clutch.	P-2
II.D.2.3	Inspect, measure, and reseal oil pump assembly and components.	P-1
	3. Gear Train, Shafts, Bushings and Case
II.D.3.1	Measure endplay or pre-load; determine necessary action.	P-1
II.D.3.2	Inspect, measure, and replace thrust washers and bearings	P-2
II.D.3.3	Inspect oil delivery seal rings, ring grooves, and sealing surface areas.	P-2
II.D.3.4	Inspect bushings, replace as needed.	P-2
II.D.3.5	Inspect and measure planetary gear assembly (includes sun, ring gear, thrust washers, planetary gears, and carrier assembly); determine necessary action.	P-2
II.D.3.6	Inspect case bores, passages, bushings, vents, and mating surfaces, determine necessary action.	P-2
II.D.3.7	Inspect transaxle drive, link chains, sprockets, gears, bearings and bushings; perform necessary action.	P-2
II.D.3.8	Inspect, measure, repair, adjust or replace transaxle final drive components.	P-2
II.D.3.9	Inspect and reinstall parking pawl, shaft, spring, and retainer; determine necessary action.	P-3
	4. Friction and Reaction Units
II.D.4.1	Inspect clutch drum, piston, check-balls, springs, retainers, seals, and friction and pressure plates; determine necessary action.	P-2
II.D.4.2	Measure clutch pack clearance; determine necessary action.	P-1
II.D.4.3	Air test operation of clutch and servo assemblies.	P-1
II.D.4.4	Inspect roller and sprag clutch, races, rollers, sprags, springs, cages and retainers; replace as needed.	P-1
II.D.4.5	Inspect bands and drums; determine necessary action.	P-2

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