74 rear end

Discussion in 'Transmission & Driveline Topics' started by Plute1970, Feb 5, 2019.

  1. Plute1970

    Plute1970 New Member

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    Will a 1974 Camaro Z28 10 bolt 8.5 posi rear end fit under a 1970 base Camaro ? I read an article that said that while the Camaro might seem the likely swap, the ’71-’81 Camaro rear axle is 1 inch wider and employs a wider leaf-spring mount.

    Can anyone provide input? I am looking for a rear end that does not have to be modified to be installed.

    Thanks
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    Both rear ends are the same width and the spring mounts are in the same place, so it will fit. I believe there is a slight difference in drive shaft length between 1970, and 1971-81.
    There are people here with more accurate knowledge so they can provide better detail for you.
     
    Last edited: Feb 6, 2019
  3. big gear head

    big gear head Veteran Member

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    What Gary said is correct.

    The information that you have is for a '67 to '69 and does not apply to the '70.
     
  4. Plute1970

    Plute1970 New Member

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    Thanks Gary and Big Gear Head, I was always told to never believe everything you read on the internet. Based on my research, I concur with your assessment. I just wanted a validation from reliable sources such as the forum.

    One last thing, the picture of the axle cover and center section indicates 10 bolts 8.5. The both axles turn in the same direction.
    What code identification on the axle validate that the axle is a 1974 posi rear.

    Thanks
     
  5. big gear head

    big gear head Veteran Member

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  6. Plute1970

    Plute1970 New Member

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    Thanks again.

    The code on the rear end is PS G60991.

    The code equates to a 1979 Nova 10 bolt 8.5 posi 2.41. The individual that sold it said it came from a 1974 Camaro Z28 10 bolt 8.5 posi rear end. Will this Nova rear end fit under my 70 Camaro? Rear end.jpg
     
  7. big gear head

    big gear head Veteran Member

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    No, but there are a lot of first gen Camaro owners who would love to have it. It will bolt in a first gen if the spring perches have not been moved. By the way, the 2.41 uses a 2 series differential, so you would be changing the differential to a 3 series if you wanted to use a gear from 2.73 to 4.56.
     
  8. Gary S

    Gary S Administrator Lifetime Gold Member

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    The PS code was used on 2.41 posi rears on Camaro and Firebird so it might be correct for a Camaro.
     
  9. big gear head

    big gear head Veteran Member

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    Measure the total width of the rear end. 60 inches is first gen and Nova, and 61 inches is second gen.
     
  10. Fbird

    Fbird Veteran Member Lifetime Gold Member

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    and...the only way to really do that would be...?

    grab 2 yard sticks to hold across the axle faces( on edge of course..) ...(yes you need a friends help or...a 3rd hand and 8' wingspan..lol)
     

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