Thanks for the info. There's actually a list of about a dozen common complaints that reflashing is supposed to address, but most of the time it doesn't make any difference because the electronic automatic transmission controller (EATX) constantly updates the shift schedules to make up for clutch pack wear and driving habits. Reflashing just sets a new starting point from where it will gradually start to update again.
You're also referring to a different problem. Miguel01's problem occurs when approaching 0 mph. The downshift to first gear occurs late and feels the same as when the transmission is shifted into gear when standing still. That's called "bump shift" and there really isn't much that can be done about it. What you're feeling at highway speed is something different that reflashing obviously helped.
Bump shift can be really annoying when you do a rolling stop where you accelerate away without coming to a complete stop. The downshift occurs just as you hit the gas and makes a really noticeable jolt. I can still feel it in my Dynasty even though I baby it.
Monday, December 6th, 2010 AT 1:28 AM