2004 2.7 SF FWD. 73K The car has a worsening shudder when shifting from 1st to 2nd after it gets hot. I pulled the batt cable to run the adaptive learning, no help. The solenoid resistances check good and the fluid is fresh, I even threw in some Dr Tranny, no help. No codes. Looks like a tranny change. I can get one at a junkyard for $400 vs 2K for a rebuild. Has anyone swapped a tranny in one of these? Anything I need to look out for?