2004r with a 3600 stall Precision Industries multi disc L/U, chip controls the lockup. On the street the transmission and converter do perfect, with very firm shifts and solid lockup at 55 MPH. At the track, 1-2 & 2-3 shifts are at 5750 RPM, and WOT lockup is set for 3rd gear @ 5700 RPM as well (106 MPH), and the datalogs show the converter locking at that time, however it doesn't stay locked. The RPMs pull down to 5300, then the RPM climbs back to 5750 within a few frames on the Power Logger, and RPMs are at 5900 going thru the traps. Anyone have an idea as to why the converter will not stay locked?