I'll cut straight to the problem. I have a 97, with the 3.4 V6 156,000 miles, 4 inch lift, 33x12.5x15. I have run into a vibration problem. I just put on new rubber, less aggressive than my previous tires, but the vibration continues. It occurs between 15-30 mph, then magically dissapears once it gets past the 30mph mark. I thought it might be the clutch or pressure plate but it still vibrates when I disengage clutch. My alighnment and front end seem fine, no vibation through the steering wheel. I'm beginning to think it might be the driveshaft bearing or something in that area. I was wondering if anyone out there has run into the same problem and if so what advice they have to fix it. Thank you for any help.