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Can a '78 rear differential fit a '95?


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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.

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I would try, at most move leaf spring perch.

shocks are still back and forward and weird. :)

 

I also find on these trucks since the 50s... there is subtle differences in overall track width. My half ton took 1.5 spacers to look normal.

this means frame and how the years made your truck look.

 

my own is a fat ass because i am square making nut with my welder.

they can do anything.

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