Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1992SUBURBAN 1/2 TON 2WD V8-350 5.7LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEDIAGRAMSFLUID DIAGRAMS4L60 (700-R4) AUTOMATIC TRANSMISSIONMANUAL SECOND
1992 GMC Suburban 1/2 Ton 2WD V8-350 5.7L
Manual Second
1992 GMC Suburban 1/2 Ton 2WD V8-350 5.7LSECTION Manual Second
With 4L60 (700-R4) Transmissions - 4WD Shown, 2WD Similar:
MANUAL SECOND
CONVERTER CLUTCH - RELEASED
2-4 BAND - APPLIED
OVERRUN CLUTCH - APPLIED
FORWARD CLUTCH - APPLIED
A forced 3-2 downshift can be accomplished by moving the selector lever from Third (3rd) Gear to Second (2nd) Gear position.
When the selector lever is moved to the Second (2nd) Gear position, RND4D3, 3rd clutch, and 3rd accumulator oil will exhaust at the manual valve. With no pressure to apply the 3-4 clutch, or release the 2-4 band, the transmission will shift to second gear.
The manual valve will also direct line pressure into the D2 passage. Drive 2 (D2) oil will act on the reverse boost valve to boost line pressure to 1206 kPa (175 psi) which is required to prevent the 2-4 band and forward clutch from slipping.
SUMMARY
The forward clutch and 2-4 band are applied. The transmission is in second gear. Also, the overrun clutch is still applied to allow engine braking when needed.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.