VEHICLE WANDERS FROM SIDE TO SIDE WHEN DRIVING AT APPROXIMATELY 30-60MPH. LOUD BANGING NOISE OCCURS WHEN GOING OVER BUMPS. HIGH FREQUENCY WHINING FROM THE ENGINE THAT ADDS TO THE NOISE. ALSO, TRANSMISSION SHIFTING HAS TOO LITTLE OR TOO MUCH POWER. DEALER/WESTERN REGION MFR. CONTACTED AND CANNOT REMEDY THE PROBLEM. PROBLEM STILL EXISTS. PROVIDE FURTHER INFORMATION. *AK