My 06 Rubicon automatic has just started with a hick-up shafting mostly from 1st to 2nd. 84,000 Miles, it just doesn't shaft smoothly. Sometime it's like the wheels drag for a split second. The other gears seem to shift okay, but maybe not as smoothly as before. The fluid looks good, I am wondering if is possibly an electrical problem? Are there codes that can be checked? I have an excellent transmission shop that has been referred, or should I take it to a Jeep dealership?