They switched to a 5 speed auto in 2005. You can find reviews all over the web. Our 2006 O/D defeat button takes you from 5th to 3rd. This is probably why you felt such a jolt when using it since you made a full 2 gear change.
Considering one with a 5 speed about 3 hours away. It's just over 200k miles with lots of maintence done and two good owners apparently. A little oil consumption and some minor body damage from turning the side into a stump. He only wants 1500. Thoughts guys? Family vehicle with possibilities...