I've used the Trans Interceptor before on my Intrigue, and while I LOVED the firmness of the 1-2 and 2-3 shift, the 3-4 and TQ converter lockup was UNBEARABLE. It would slam locked SO hard the car would jerk, and that was at part throttle. The ATI also seemed to vary it's line pressure setting quite a bit, as intermittently I'd have the TC lock up and NOT unlock because there's too much pressure and the car would set an SES and stall at lights.
I used it about 2 days and removed it. Has anyone had this problem with the B&M? And do they make one for the 4T45E?