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 DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLEDESCRIPTION AND OPERATIONFLUID POWER FLOW DESCRIPTIONDRIVE RANGE - FIRST GEAR
1990 Chevrolet Lumina APV V6-191 3.1L
Drive Range - First Gear
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Drive Range - First Gear
In this range, the converter is filled, the forward clutch is applied and the transaxle is in Drive range-first gear.
With selector in Drive position, the manual valve is positioned to permit line pressure to enter the drive passage. Drive oil then flows to the following:
1. Forward clutch.
2. Governor assembly.
3. 1-2 shift valve.
4. 1-2 accumulator valve.
Drive oil is directed to the forward clutch through an orifice where it acts on the clutch piston to apply the forward clutch.
Drive oil is directed to the 1-2 shift valve, and then to the 1-2 accumulator valve and is regulated to a pressure called 1-2 accumulator pressure. This pressure is directed to the 1-2 accumulator piston to act as a cushion for the band apply on a 1-2 shift.
Drive oil at the governor assembly is regulated to another variable pressure which is called governor pressure. Governor pressure increases with vehicle speed and acts against the 1-2 and 2-3 shift valves and the 3-2 control valve.
With selector in Drive position, the manual valve is positioned to permit line pressure to enter the drive passage. Drive oil then flows to the following:
1. Forward clutch.
2. Governor assembly.
3. 1-2 shift valve.
4. 1-2 accumulator valve.
Drive oil is directed to the forward clutch through an orifice where it acts on the clutch piston to apply the forward clutch.
Drive oil is directed to the 1-2 shift valve, and then to the 1-2 accumulator valve and is regulated to a pressure called 1-2 accumulator pressure. This pressure is directed to the 1-2 accumulator piston to act as a cushion for the band apply on a 1-2 shift.
Drive oil at the governor assembly is regulated to another variable pressure which is called governor pressure. Governor pressure increases with vehicle speed and acts against the 1-2 and 2-3 shift valves and the 3-2 control valve.
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.