Vehicle has had a noise when backing up coming from the rear since i bought it in 2007, complained to eagle chevrolet-say its normal and they did nothing. now had rear differential problems and had to pay to have it drained and refilled. gm fluid-gm refuses to re-imburse. car no longer has that noise. could have caused major issues and an accident if it was not repaired. complaint about lack of warranty service when new.