Hi, I'm looking to purchase my first XJ. I've had a 93 Wrangler and a new 81 CJ7 back in high school. From what I want to do and what I have looked into, I want to probably put a 3" lift on one and 31" tires. There isn't a rock within 100 miles of me! It will mostly be use at the beach, moderate trails and must have good road manners. Here is a few of my questions. Are there any year models to stay away from? When did air bags appear? When was the freon switched to the new type? I know to go with the 4.0L.