Just some general advice to everyone: If you are having trouble that you think might be your transmission, check your transmission fluid level. If it is low, add fluid (of course checking your owners manual to make sure you are adding the correct fluid). If it is leaking, check it daily or weekly.
If it is not leaking (or if you aren't having any transmission trouble), check the transmission fluid level monthly or at least at every oil change. This goes for Hondas and Toyotas too
I discovered my 95 leaked like a sieve a few years back. It lost about a quart every two months. My household is very busy, and it is difficult to find time to schedule a day-long service. So, because I knew it was leaking, I checked it vigilantly, every time I got home (and the fluid was hot), and made sure I added ATF+3 if it needed it. It eventually got a complete seal job. But if I had not kept the trans fluid level up, it would have probably left me stranded...or worse. It was definitely out of warranty.
Also, my transmission shop, which does excellent work and who I recommend to people, recommends idling in NEUTRAL rather than PARK, contrary to the dipstick instructions.
2005 Dodge Grand Caravan SXT, 129K mi.
Former owner of:
1988 Dodge Caravan SE, 2.5L I4 (1988-1995, 99K mi); 1995 Plymouth Grand Voyager SE "Rallye", 3.3L (1995-2004, 169K mi); 2003 Grand Caravan Sport, 3.8L, (2004-2008, 106K mi), 2008 Nissan Quest, (2008-2010, 25K mi)
2008 Lexus RX400h (Dark Gray), 112K mi; 2005 Hyundai Elantra GT (Blue), 89K mi