With the following information, you can identify whether it is a Volvo 1030 small stern or a 1031 large stern: The 1030 and DANA 30 rear axle usually do not have a crush washer, which the 1031 rear axle do. 1030 pinion nut is inch thread "M20" full class and correspondingly 10131 it is bigger M24 The diameter of the disc wheel is 1030 7" (approx. 178mm) and 1031 it is 7.7" (approx. 196mm) The outer diameter of the pinion's larger bearing is 1030 approx. 72mm and 1031 approx. 76mm respectively
