Hello. I have a 94 ford explorer. 182,000 miles. Original owner. >Maintained very well.>Problem: You can be driving down the road with your foot off the gas at >any speed and no vibration. When you apply power or load the Drive train >vibrates the whole car and with a very low pitched rumble. At 65 - 75 it >is very noticible inside the cabin (loud) Problem started as a slipping >transmision gears. That problem changed from slipping to a vibration or a >shutter under load at 45 mph to 75 mph. The transmision shop did find a >damaged tranny. They rebuilt it and the torque converter. Vibration >continued. The balancer has been changed. The drive shaft was taken out >and tested to be true and balanced. The fly wheel was checked. I used the >same tranny shop at 75,000 miles for a rebuilt and I trust the shop owner >but he and his mechanics are stumped. Please help. Thank you