I have a 90 F350 with a mini pumper on the rear that we would like to add dual wheels to on the rear for better load carrying capacity. The Vin # 1FDHF38G2MKA16100. Axle code 35 ,Springs 48F. The GVWR is 8000-front 4600, rear-6084 according to the tag on door.... Login to read more.