B4000 Regular Cab 4WD V6-4.0L OHV (1997)
Torque Converter Clutch: Testing and Inspection
NOTE: Engine coolant temperature must be above 53°C (128°F) and below 116°C (240°F). This temperature can be obtained after approximately 15
minutes of highway driving. Since most torque converter clutch shifts are difficult to feel (much less noticeable than a 1-2 or 2-3 upshift) a tachometer
and vacuum pressure gauge must be connected to the engine.
To check the torque converter clutch for engagement/disengagement, drive the vehicle at approximately 80 km/h (50 mph) and, while maintaining this
speed, release throttle for about two seconds then reapply throttle to previous setting. The engine rpm and vacuum should increase when throttle is
released, and decrease in about five seconds after the throttle is reapplied and the clutch engages. If the torque converter clutch does not engage, refer to
Symptom Troubleshooting.
