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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISDIAGRAMSFLUID DIAGRAMSAUTOMATIC TRANSMISSION/TRANSAXLEMANUAL LO
1990 Chevrolet Lumina APV V6-191 3.1L
Manual LO
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Manual LO
Manual Lo:
MANUAL LO
FORWARD CLUTCH - APPLIED
LO AND REVERSE CLUTCH - APPLIED
Maximum downhill braking can be attained at speeds below approximately 40 mph (64 km/h), with the selector lever in manual First position. Manual First oil pressure is the same as intermediate 827 kPa (120 psi) because intermediate oil is still present.
Lo oil from the manual valve is directed to the 1-2 throttle valve. Lo oil pressure and the 1-2 Throttle Valve (T.V.) spring force will close the 1-2 shift valve at speeds below approximately 40 mph (64 km/h). This allows lo oil to enter the lo 1st passage where it seats the lo 1st checkball (3) and passes through an orifice to the lo blow off valve, which exhausts lo 1st oil down to 241 kPa (35 psi). The lo 1st oil is then directed to seat the lo and reverse checkball (4) and to the lo and reverse clutch for a smooth apply.
SUMMARY
The forward clutch is applied. The lo and reverse clutch is applied. The transmission is in Manual First Gear.
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.