I have a 04 na-t is300 running on e-manage b, with a dragon torque converter stall set at 2800 and a toyomoto vb upgrade. I just recently (2 weeks) flushed the trans with redline d4 synthetic ATF. Now, I'm not sure if you'd call it slipping but it's not catching from 2nd to 3rd. The only way it'll shift is if you let off the pedal and slow down to about 15mph. It's not throwing any cels. I'd appreciate some feedback on this before I buy a new tranny.