Hey guys, been a while since I've logged on, just been crazy busy with things which in a way brings me back here. I purchased a 2002 Aurora 3.5 V6 with the same 65E transmission the Bonneville uses in May 2008. A few months later, the transmission started to have a very lazy shift when cold. Just prior to the transmission shifting, you could feel the engine lose a lot of power, and the shifts would be very slow/mushy. After driving around 2 miles, the transmission would shift quickly/firmly like normal. Now, the problem has intensified and has more symptoms. NOW when cold, if you push the gas down quickly the car will accelerate like it is bogging down horribly, then there will be a very harsh SLAM sensation and the car will accelerate normally, but still with the soft shifts. It does NOT feel like a transmission "slip." I have had it to a Buick dealer and they did a transmisison flush/filter change, and the problem remained. I had around $400 in labor in "diagnosing" a problem but they could find nothing wrong. I can't afford the time, or money to leave it at the dealership any longer. Does anyone have any ideas of what this could be? I'm stumped and admittedly don't know too much about transmission problems.
The best way I can describe when the transmission slams is like doing a neutral drop. The car will barely move then all the sudden the power kicks in, sometimes making the tires even squeal. I have a video of when the transmission shifts softly. The RPM's drop fast, then bounce back up oddly. Also, look at the beginning. You can see the RPM's jump when I hit the gas, but the car doesn't start moving for a second or two. The transmission fluid is bright red, and is not burned. one final thought as well, when fully warmed up you can drive the car normally and everything is A-ok. you can do a full throttle first-gear downshift, and it will accelerate like a brand new car. If you were to do a full throttle downshift into first gear when the transmission is cold, the car would drop out of gear and redline. This is really a problem because I drive the highway every morning and it is VERY difficult to merge on when the transmission just won't GO. Thanks for any help guys! (this car is making me go broke!!)

2007 Saturn Aura XR with 3.6L V6.
Original B.C. Join Date August 12th, 2002.