Sounds to me that your shift cables are bad, or even the clip on the tranny has come loose that indicates shifter position. These are all of your "upgears"(1,3,5), so it sounds like something isn't allowing it to engage fully into gear. I had a problem like this after I slammed 2nd gear and popped the cable out of the little clip that holds it's position. This just might be the culprit for you.
Mark
