This seal prevents leakage at the drive axle, and is located in the differential housing, For keeping gear oil in place. Drive Axle Output Shaft Seal. Front drive shaft output shaft seal. Reference Number: For GENERAL MOTORS: 90342143, For OPEL: 03 74 151, 03 74 514, 03 74 528, 374151, 374514, 374528, For VAUXHALL: 90342143.