So as I was driving my van today I shifted from 1st to 2nd or 2nd to 3rd, I don't remember now, and it just locked up on me. Shifter is stuck in the middle and will only go down into 2nd or 4th. Can't really tell, I think its second. It wont move left or right at all. The shift links all look good. I've gone pretty long never having to work on a tranny before and knowing very little about them. Looks like that's about to change...