Jump to content

Can a '78 rear differential fit a '95?

hawk1122

Recommended Posts

hawk1122 New Member

hawk1122

Posted
Posted

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.

barry G Senior Enthusiast

barry G

Posted
Posted

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.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      2 speed transfer case optional now?

      By Chuck FB · Posted

      Yes, and also pulling heavy trailers or a large camper up steep grades as well as descending grades such as the more rustic off road camping locations and using engine braking with that low gearing as well as soft ground can just suck the power . I realize pickups these days tend to have an over all lower first gear ratio compared to automatic transmission pickups from years back so that has helped a lot in its ability in high range but there comes a point if in four wheel drive the torque runs out at the wheels, certainly with a gas engine. They don't put two speed transfer cases on pickups for a cool factor, they have a function if one needs that massive torque to the wheels that high range can't deliver. 
    • Grumpy Bear
      Grumpy Bears 2015 Silverado 2WD

      By Grumpy Bear · Posted

      Notes 7/18/2026   3,400 miles on this batch of Mobil 1 Euro 5W40 since the GDI pump replacement. Alcohol runs very clean when ring seal is tight and the sump isn't getting hosed with fuel. Checked oil level at fill up today as is my practice and grabbed a white Kleenex to look at the color. What color?  I was going to change it but.....  
    • Another JR
      2 speed transfer case optional now?

      By Another JR · Posted

      4 low is really nice on steep boat ramps. 
    • Chuck FB
      Gas Prices

      By Chuck FB · Posted

      Interesting, I suspect I would have fueled up in Lee Vining as the day prior I would have filled up either in Laughlin or near there and maybe again before I entered Death Valley and once out the other side late that evening as I kept on driving into the night up near Lee Vining. Next morning I most likely fueled up in LV before heading over Tioga Pass into ( as I refer to it as "Yose .... Mite" 😁 ). And again that was 19 years ago but the price then must not have jumped out at me like the 5 bill a gallon theme of nutty cult hippy country Big Sir or head so far up their rear Aspen. I'd be curious to know where the highest prices are in the lower 48, I probably would not be far off to guess somewhere in Cali forn ie. Coldfoot and Prudhoe bay may have those prices beat but that is a whole other world up there and when prices are more normal elsewhere that is about what they can be up there I believe in no mans land. Anyway interesting that the 395 corridor is hosing people and the thing is, its tourist season and its not like there are a lot of competition options when driving up that highway from what I could see. Yup, big ole Boaterhomes and various other RV's ahead and behind me at the Yosemite entrance gate and they have to get their fuel somewhere.  
    • Atlas
      Gas Prices

      By Atlas · Posted

      Those can be high, as well as the big California cities. The ones that will pop your eyes out are the 395 corridor on the Eastern side of the Sierra Nevadas. Lee Vining, $7.19 for regular and $8.89 for diesel is what the Google said right now.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...