You are looking at a 35 spline posi unit carrier from a 1985 GMC 3500 Truck with Dana 70 rear axle, cast # C31709. Fits most Dana 70 14 bolt housings. 3 series carrier will allow you to run 3:23 to 4:10 gears. The outer bearings in the picture have been removed to make way for your new bearings. Good condition. Just needs cleaned.