Wondering if anyone has heard of a TSB for the '05 F150s concerning TCC lockup on the 1-2 shift. I'm having a shudder/slippage during the 1-2 shift with moderate to low throttle, disappears with more throttle pressure. Thanks.

Make: FORD Model: F-150 Year: 2005

Service Bulletin Number: 051012 NHTSA Item Number: 10017933 Summary Description: HARSH 3-2 DOWNSHIFT BETWEEN 17-25 MPH (27-40 KM/H) - NO DTCS - 4R75E AUTOMATIC TRANSMISSION - VEHICLES BUILT BEFORE 4/20/2005. *TT

-this is all I found... are you certain of your problem? how did you come to this conclusion? Why would the TCC lock-up shifting from 1st to 2nd? Have you tried accelerating from first to second (try to re-produce this symptom) with your other foot very lightly on the brake at the same time? this brake signal would disengage the TCC... just a thought