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Rear Diff exploded

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5Blazer, Sep 10, 2002.

  1. 90K5Blazer

    90K5Blazer Registered Member

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    170,000 miles and the rear diff has had it. Not in a mud bog or a rock crawl but doing about 25mph on the street. Sucks! anyhow, does anyone know if I can use a diff out of any K5 with a 10 bolt 8.5"? If not what years will fit? And if the whole diff won't work what about the carrier out of another diff? I plan on doing lockers and regearing, but for now I need a quick fix. and a cheap one too. Any help would be greatly appreciated!! Thanks in advance.
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Gotta watch axle spline count. Think the 28 to 30 spline change was '88.

    You could swap carriers, and use the same side gears, but not really that good an idea, or likely possible, if yours grenaded. You could always get another 10 bolt any year, complete, and bolt it in, regardless of spline count.
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Any year from an 80 or so pickup or K5 to 91 or 87 for pickups. The 88-98 bodystyle vehicle's axle will not bolt up.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    The spline count changed..you can use a *K5 axle assembly from '80-91*, but the spline count did change, which means side gears are different, hence my answer to his question about if the whole thing won't interchange...

    Just find another axle assembly that is from an '81-87 truck (or '91 K5, burban, etc) with the right gear ratio.
     
  5. 90K5

    90K5 1/2 ton status

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    actually, anything from 73-91 should bolt up as long as its not a 1 ton...the earlier ones will be 12 bolts though...maybe its time to upgrade to a 14 bolt?
     
  6. nofeartruckin00

    nofeartruckin00 1/2 ton status

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    dyeager is right. If you don't buy the entire axle, and just get the differential, you have to watch spine count. I believe he is right, '88 is the break year, with 28 splines before, and 30 after. But if you get an entire axle, no worries about spline count then.
     

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