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Hey all, I have a 1995 Sierra K3500 with a 14 bolt 10.5'' 4.10 30 spline rear, but it's not a posi and I'm looking to make it one the cheapest way possible. My father had a 1978 K30 with the exact same rear (14 bolt 10.5'' 4.10 30 spline) but with a posi. He ended up swapping it out with a open diff. Currently that posi unit is sitting at my Grandma's house in the shed and I'm wondering if I can use that. It is completely stock with the 4.10 still on it. So, I'm wondering if I could just take my current diff out of the cover and place the '78 unit in there no problem or is there more to it/not even possible? I'm not too familiar with rears so I'm not sure if the 17 year gap between the 2 trucks make a big difference in terms of rears. Thanks, Hawk.