Stall Speed Test

1. Remove plug from pressure tap and install adapter 18G677-2 and a suitable pressure gauge.
2. Connect a tachometer to engine.
3. Block drive wheels and apply service and parking brakes.
4. Start engine and place selector in D, then depress accelerator pedal completely and note tachometer and pressure gauge readings. Do not perform this test for longer than ten seconds, as damage to the transmission may result.
5. Idle engine in N for at least two minutes to allow transmission to cool, then repeat test in R.
6. Stall speed should be 2100-2400 RPM. Line pressure at stall speed should be 145-155 psi in D position and 240-260 psi in R position.
7. If stall speed is less than 1800 RPM, the converter clutch is slipping. Replace as necessary.
8. If stall speed is 1800-1900 RPM, the engine is improperly tuned. Correct as necessary.
9. If stall speed is greater than 2400 RPM, transmission clutches are slipping. Repair or replace as necessary.