I was driving tonight on the freeway for 60 miles, I slowed down for a curve and went to go again and the trans limped into 4th gear, I had to stop and I didn't have reverse..just 4th gear.so I turned the truck off, wait 10 seconds, restart, and still had nothing, then I put it in reverse and I had it, put it in drive, and it was fine for 10 miles and it did it again, I get a PO700 code. what do I do? this happens weekly, and the dealer doesn't know what to do so they just clear the codes and tell me to drive it. also, the other thing it does once in awhile..when taking off..the trans will miss third gear nad its like in neutral, I let off the throttle and it will hit third really hard then things are ok. please help!