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 MANUALSCHEVROLET1982CAVALIER L4-112 1.8LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEDESCRIPTION AND OPERATIONPOWER FLOWPART THROTTLE 3-2 DOWNSHIFT
1982 Chevrolet Cavalier L4-112 1.8L
Part Throttle 3-2 Downshift
1982 Chevrolet Cavalier L4-112 1.8LSECTION Part Throttle 3-2 Downshift
A part throttle 3-2 downshift may be obtained below about 50 mph by depressing the accelerator pedal far enough to move the throttle valve (T.V.) plunger to allow shift T.V. oil to enter the part throttle (P.T.) passage. This oil, called part throttle (P.T.) oil, is then routed to the 2-3 T.V. valve.
Part throttle oil and the 2-3 spring force will close the 2-3 shift valve against governor oil, shutting off RND oil to the direct clutch passage. Exhausting direct clutch oil seats the direct clutch exhaust check ball, flows through the two orifices and is exhausted at the 2-3 shift valve. At the same time, direct clutch accumulator oil from the intermediate servo also exhausts through the same route as direct clutch oil. Second oil acting on the servo piston applies the band for a smooth band apply as the direct clutch is released.
Part throttle oil and the 2-3 spring force will close the 2-3 shift valve against governor oil, shutting off RND oil to the direct clutch passage. Exhausting direct clutch oil seats the direct clutch exhaust check ball, flows through the two orifices and is exhausted at the 2-3 shift valve. At the same time, direct clutch accumulator oil from the intermediate servo also exhausts through the same route as direct clutch oil. Second oil acting on the servo piston applies the band for a smooth band apply as the direct clutch is released.
RENDER: 1.0x
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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.