1982 camaro z28 automatic 305: The cable is too long at the shifter assembly and from what I read you can adjust the length at the cable barrel by removing the plastic U lock from the barrel. Then the barrel should slide back or forth to the desired spot. Then snap the plastic U lock back into the barrel to lock it in place. I have done all of this and the barrel won't budge in any direction along the cable. Im out of ideas and need help! Thanks in advance.