I found two Motive choices, what is the difference between them besides the price? Got an appointment to fix the "hum" in the rear housing in the 94 9C1 on April 23rd.
http://www.summitracing.com/search/part-type/ring-and-pinion-gears/ring-and-pinion-ratio/3-42-1/axle-model/gm-8-5-in/brand/motive-gear?N=4294945313%2B4294945268%2B4294945461%2B401013&SortBy=Default&SortOrder=Ascending