[b454rat]

Pull the cover and look for the date code. I'd say early to mid 90s. I have had 2 trucks, 1 88 and 1 89 and they had Dana 70s in them. I replaced the 89 with a 14 bolt from an 93 3/4 ton. Not sure why one axle got slip drums when others were pressed. I have a van axle from an 02 3500 SRW, slip on drums.