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Simple question...

Discussion in 'The Garage' started by speedyvision917, Aug 5, 2005.

  1. speedyvision917

    speedyvision917 1/2 ton status

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    What years and what model trucks did GM put the 12 bolt in? Thats all, thankyou.
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    They were in many trucks from the 60's to 82 .

    The ones in Blazers from 69-72 have the one ton perch spacing . And the ones in 73-82 Blazers have the 3/4 ton perch spacing .

    Some gearsets and yokes fit from cars , but basically the 12 bolt truck is entirely different .
     
  3. diesel4me

    diesel4me 1 ton status Premium Member

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    best guesses...

    I've seen them in 67-80 GM trucks,but they might have used them in older years too..I had several first generation (67-72) trucks with 12 bolt rear axles,my 79 C10 has one...someone else probably has the exact years listed in a GM book I bet... :crazy:

    Edit!--they used the 12 bolt in 1/2 ton trucks only,as far as I know..(C-10,K10,K5,)... :crazy:
     
  4. speedyvision917

    speedyvision917 1/2 ton status

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    I hope your right deisel, im looking for exact years, i havent been able to find anything online though. Pauly how do you like running the 12 bolt? and what size tires are you running with it?
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Some were 3/4 ton in the 60's and had six lugs on 2wd's , using the 12 bolt truck .

    I love my 12 bolt , I run it locked with 10 bolt ( bigger , mine was a 73 2wd axle ) drum brakes . And the other one is locked with a 1350 yoke . I have 2 trucks .

    I only run 33's for now . 35's on trail truck , but it hasn't driven yet .

    I know a guy who broke some stock shafts doing crazy trails , after 20 something years of being in the axles . He runs Superiors now , and I don't think hes broken one :D
     
  6. R72K5

    R72K5 Banned

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    '64-82 is official years of the truck 12 bolts, trucks, blazers, burbs, 10 vans

    most all under 5 and 10 series trucks however i know some of the old 20 series vans were 12 bolt til starting in 77 when the trucks blazers burbs also started going 10 bolt

    good luck
     

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