I just purchased an automatic 2003 wrangler with about 80,000 miles. After about 2 months of driving it, a suddenly started noticing that when it's switching from 3rd to 4th gear (or it could be when going into O/D), the transmission it will jump/slip, I'm not exactly sure how to describe, but it's a slight hesitation while the engine revs briefly. It's still drivable and have no other problems with the transmission. Last week, I decided to turn OFF the overdrive to see if that made a difference, and to my surprise, it didn't slip/jump when the overdrive is turned off. I'm not a car guy at all, so I have no idea what this means. But anyone have any ideas what this I should do? any comment would be appreciated.