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Converter Clutch Test

Connect tachometer to engine. Ensure engine and transmission is at normal operating temperature. Drive vehicle at approximately 50 MPH in "D" (overdrive on). Release throttle for about 2 seconds then reapply throttle to previous setting. Engine RPM should increase when throttle is released (clutch disengages). Engine RPM should decrease in about 5 seconds (clutch engages), after throttle is reapplied. If converter clutch does not engage or is engaged continuously, see appropriate AUTO TRANS DIAGNOSIS - FORD 4R44E & 4R55E CONTROLS article.

CAUTION: Perform line pressure test before performing stall speed test. If line pressure is low at stall, DO NOT  perform stall speed test or transmission damage will occur. DO NOT  maintain Wide Open Throttle (WOT) in any gear for more than 5 seconds.
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