There are several things controlling torque converter lockup that make it a bit difficult to pinpoint. There are time delays, load calculations, trans temps, and even RPMs that can delay or even prevent a lockup from occurring. Because of this, there is no clear-cut way to control converter lockup. We can usually finesse the values enough to achieve what we're looking for, but sometimes the ECM has a mind of its own.
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Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1997!
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