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just bought a 92 GMC 3500 dually with a 454/4L80E tranny (only 2 wheel drive for now) only cab and chassy for now. with a dana 70 rear i think. Between 30mph-45mph I get a horable vibration weather im on or off the gas. Checked the ujoints and all feals tight. could this be tires or because there is now bed on rear for waight. thanks for any help
