I guess I should wade in here. I've had my '98 Grand Cherokee for a long time now. 156,000+ miles worth of long time. It's got the 4.0 six, auto, 4X4. The only things that have given me trouble are the rear axel bearings, and the water drain for the hearter/A/C unit. As I have stated on here numerous times, this is the best truck I've ever owned! I'm sure others will tell you they've had thair share of troubles with these Jeeps. But I for one am as pleased as punch with mine. Just make sure you get service records with any one you find. It could mean a big differance as to how it's been taken care of.