My 94 GT (Auto) has a pronounced vibration on moderate-to-hard acceleration from a standing start, and hard accelertion from low speeds (5 - 30mph). No vibration on hard acceleration at higher speeds, or while decelerating. I checked the universal joints, and found that one was bad, so I replaced both of them (front and rear), but this did not solve the problem. It seems to be coming from the front part of the driveshaft. What else should I be checking? Trans or engine mount/mounts? Driveshaft slip yoke? Any suggestions would be most appreciated. Thanks.