My tranny has been acting funny sometimes. when i come to a stop and i go to put it in 1st it acts like first gear is blocked. i push and it's like the guides or something is blocking the gear, so i put the truck in 2nd and get it to move just a little and then put it back in 1st and it goes in without a problem. i have a warrenty left for another 10k miles and it covers the tranny. should i take it in or not?