Stall Speed Test

The stall speed test checks torque converter clutch operation and installation, the holding ability of the forward clutch, reverse clutch (the low-reverse bands), the planetary one-way clutch, and engine performance.

Conduct this test with the engine coolant and transmission fluid at proper levels and at normal operating temperature.

Apply the service and parking brake control (2780) firmly for each stall speed test.

1. Find the specified stall rpm for the vehicle by referring to Specifications at the end of this section. Use a grease pencil to mark the rpm on the dial of a tachometer.

2. Connect tachometer to engine.

   NOTE: If the rpm recorded by the tachometer exceeds the maximum limits given in Specifications, release the accelerator pedal immediately because clutch or band slippage is indicated.

3. In each of the following ranges: D, 2, 1, R, press the accelerator pedal to the floor and hold it just long enough to let the engine get to wide open-throttle. While making this test, do not hold the throttle open for more than five seconds at a time.

4. Note the results in each range.

5. After each range, move the selector lever to NEUTRAL and run the engine at 1000 rpm for about 15 seconds to cool the torque converter (7902) before making the next test.

6. Refer to the following chart for corrective actions.
   
   

   Selector Position	Stall Speeds High	Stall Speeds Low
   D	Planetary One-Way Clutch
   D, 2 and 1	Forward Clutch or Intermediate Clutch
   D, 2, 1 and R	Perform Pressure Test	Torque Converter Stator One-Way Clutch or Engine Performance
   R	Reverse Clutch or Low Reverse Band or Servo