Freezing up here. Question on Transmission

[mhorning]

So I went out this morning to start my truck. It got down to -11 last night. Now my truck started but the transmission won't go into forward or reverse. I can feel it sort of catch in forward, but in reverse it just sits at idle. Anyone know why. I assume it will get better when it warms up. But does this mean the transmission is dying? And anyone know what I'll have to do to fix it? It's a 700R. As always. Thanks guys.