I've been searching around the forums for a bit now, trying to find a similar problem that I am having, but so far have come up empty. Hopefully you guys can help me out?

Basically what is happening is that if I start my car up, and don't let it warm up for 2-3 minutes, it will shift into D extremely hard. I'm talking like I'm thinking one of these days the transmission is gonna just fall off the car. However, if the car has warmed up, it will shift into D just fine. Reverse seems to be OK regardless of whether or not the car has warmed up or not.

What could be a possible problem here? The car has 131k miles. I've checked the tranny fluid level, and it is fine. Any help is appreciated.