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SPECIAL TOOLS

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Special Tools Illustration Tool Number/Description J 7004-A Universal Remover J 8001 Dial Indicator Set J 8092 Driver Handle J 8433 Two Jaw Puller J 8763-02 Holding Fixture and Base J21426 Extension Housing Seal Installer J21465-15 Sun Gear and Stator Shaft Bushing Remover J 23327-1 Forward Clutch Spring Compressor (Bridge) J 23456 Booster and Clutch Pack […]

FLUID PASSAGES

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Fig. 498: Pump Body Fluid Passages (Pump Cover Side) Courtesy of GENERAL MOTORS CORP. 2007 TRANSMISSION Automatic Transmission – 4L60-E/4L65-E/4L70-E – H3 Callouts For Fig. 498 Callout Component Name 1 Suction (intake) 2 Decrease 2 Decrease 3 Line 3 Line 3 Line 4 Converter Feed 4 Converter Feed 4 Converter Feed 5 Release 7 To […]

MANUAL FIRST GEAR

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A manual 2-1 downshift can be accomplished by moving the gear selector lever into the manual first (1) position when the transmission is operating in second gear. The downshift to first gear is controlled electronically by the PCM. The PCM will not energize the 1-2 shift solenoid valve to initiate the downshift until the vehicle […]

MANUAL SECOND GEAR

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A manual 3-2 downshift can be accomplished by moving the gear selector lever into the Manual Second (2) position when the transmission is operating in third gear. This causes the transmission to shift immediately into second gear regardless of vehicle operating conditions. Also, the transmission is prevented from operating in any other gear, first, third […]

MANUAL THIRD GEAR

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A manual 4-3 downshift is available to increase vehicle performance when the use of only three gear ratios is desired. Manual Third gear range also provides engine braking in Third gear when the throttle is released. A manual 4-3 downshift is accomplished by moving the selector lever into the Manual Third (D) position. This moves […]

OVERDRIVE RANGE, 4-3 DOWNSHIFT

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When the transmission is operating in fourth gear, a forced 4-3 downshift occurs if there is a significant increase in throttle position. At minimum throttle, the vehicle speed decreases gradually (coastdown) and the PCM commands a 4-3 downshift. The PCM also initiates a forced 4- 3 downshift when the throttle position remains constant but engine […]

OVERDRIVE RANGE, FOURTH GEAR – TORQUE CONVERTER CLUTCH APPLIED

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At higher vehicle speeds, the Hydra-matic 4L60-E transmission uses an overdrive gear ratio (fourth gear) in order to increase fuel economy and in order to maximize engine performance. When vehicle operating conditions are appropriate, the PCM energizes the 1 -2 shift solenoid valve to shift the transmission into fourth gear. 1- 2 Shift Solenoid (SS) […]

OVERDRIVE RANGE, SECOND GEAR

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As vehicle speed increases and other operating conditions are appropriate, the PCM de-energizes the 1 -2 shift solenoid valve in order to shift the transmission to second gear. 1- 2 Shift Solenoid (SS) Valve De-energized (turned OFF) by the PCM, the normally open solenoid opens and signal A fluid exhausts through the solenoid. 2- 3 […]

NEUTRAL – ENGINE RUNNING

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When the gear selector lever is moved to the Neutral position (N) from the Reverse position, the following changes occur to the transmission hydraulic and electrical systems. Manual Valve In the Neutral position, the manual valve blocks the line pressure from entering any other fluid circuits. Reverse and PR fluids exhaust past the manual valve. […]

PARK – ENGINE RUNNING

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With the gear selector lever in the PARK (P) position and the engine running, the line pressure from the oil pump assembly is directed to various components in the valve body and the oil pump. The pressure regulator valve regulates the oil pump output (line pressure) in response to the signal fluid pressure, the spring […]