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81 burb rear end to a 72 jimmy?

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by hjalbert3, May 6, 2004.

  1. hjalbert3

    hjalbert3 Registered Member

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    anyone know if a 1/2 ton 4x4 81 burb rear end will fit a 72 jimmy 4x4 ? Im wondering about the spring perches and the shock mounts. the ratios are the same, and they are both 12 bolts, thanks hj
     
  2. Beast388

    Beast388 1/2 ton status

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    Not without some modification. The '81 axle has shock tabs that are on opposite sides. The shocks on your '72 both mount on the front of the axle. The spacing is different too.

    The spring perches are different as well. The '81 axle will have a center to center distance of 42.5" Your '72's distance is 40". Time to break out the torch and welder. /forums/images/graemlins/grind.gif /forums/images/graemlins/weld.gif /forums/images/graemlins/hack.gif /forums/images/graemlins/waytogo.gif
     
  3. bigyellowjimmy

    bigyellowjimmy 1/2 ton status

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    Also wouldnt the 81 Burb rear diff be a 10 bolt?

    BTW a 2nd Gen SRW 1 ton will bolt right in but you will have to still move the one shock mount to the front of the axle tube /forums/images/graemlins/thumb.gif
     
  4. BlazerGuy

    BlazerGuy 3/4 ton status

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    [ QUOTE ]
    Also wouldnt the 81 Burb rear diff be a 10 bolt?


    [/ QUOTE ]

    GM started to phase out the 12b rears in early 80's so you could see a '80 with a 10b rear or a '84 with a 12b rear. There wasn't a clear cut date when they switched over...
     
  5. bigyellowjimmy

    bigyellowjimmy 1/2 ton status

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    [ QUOTE ]
    GM started to phase out the 12b rears in early 80's so you could see a '80 with a 10b rear or a '84 with a 12b rear. There wasn't a clear cut date when they switched over...

    [/ QUOTE ]

    /forums/images/graemlins/thumb.gif
     
  6. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    [ QUOTE ]
    There wasn't a clear cut date when they switched over...


    [/ QUOTE ]

    Very rare for a 12bolt after 81 though /forums/images/graemlins/k5.gif
     

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