Stall Speed Test

WARNING: Apply the service and parking brakes firmly while carrying out each stall test.

CAUTION: Carry out the LINE PRESSURE TEST prior to carrying out the Stall Speed Test. If line pressure is low at stall, do not carry out the stall test or further transmission damage will occur.

NOTE: If the Transmission Tester is installed, it must be removed prior to carrying out the test.

NOTE: If equipped, turn the power take-off (PTO) unit off for correct test results. For a description of PTO operation, Refer to TRANSMISSION ELECTRONIC CONTROL SYSTEM in this article.

NOTE: The stall test should only be carried out with the engine and transmission at normal operating temperatures.

The stall test checks the operation of the following items:

Torque converter one-way clutch
Forward clutch
Low one-way clutch
Reverse clutch
Overdrive one-way clutch
Direct clutch
Engine driveability concerns

Connect a tachometer to the engine.
After testing each of the following ranges, (D), 2, 1 and R, move the transmission range selector lever to N (NEUTRAL) and run the engine for about 15 seconds to allow the torque converter to cool before testing the next range.

CAUTION: If the engine rpm recorded by the tachometer exceeds the maximum specified rpm, release the accelerator pedal immediately. Clutch or band slippage is indicated.

CAUTION: Do not maintain wide-open throttle (WOT) in any gear range for more than 5 seconds or transmission damage may occur.

Press the accelerator pedal to floor (WOT) in each range. Record the rpm reached in each range. Stall speeds should be in the appropriate range.