Will it fit?

Discussion in 'Got gears?' started by Chuck George, Jan 16, 2021.

  1. Chuck George

    Chuck George Member

    Have a lead on a 8.5" 10 bolt posi rear end. It is out of a 1969 GTO. From searchs I have done it doesn't seem like it will bolt into a 1970 Skylark. I'm thinking they're both "A" bodies and it should. So my question is will it fit, if so any modifications needed?
     
  2. BrianTrick

    BrianTrick Brian Trick

    1: The 69 GTO came with an 8.2”. If that is what it really is,it is a direct swap. No modifications needed.

    2: If it IS an 8.5”,it came out of a 71-72 Skylark/GS or 71-72 Cutlass/442. When swapping an 8.5” into a 1970 Skylark/GS,you will need to shorten your driveshaft 3/4”. That is it.

    If you are not sure what it is,post pictures here,or send them to me,so we can identify it correctly.
     
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  3. Chuck George

    Chuck George Member

    Check your FB Messenger
     
  4. Chuck George

    Chuck George Member

    Still looking......saw this , wondering if the posi unti with ring & pinion will fit into a BOP 8.5 10 bolt rear? This is the ratio I'm looking for.
    "8.5 ten bolt possi, 3.42 ratio out of 75-79 Nova will fit 68-74 Nova or 67-69 camaro but is 1 inch wider ."
     
  5. monzaz

    monzaz Jim

    CG
    What are you asking here?
    You said you have a 1970 Buick rear... Or do you have a 8.5 rear?
    Or is this a ad you saw '8.5 ten bolt possi, 3.42 ratio out of 75-79 Nova will fit 68-74 Nova or 67-69 camaro but is 1 inch wider'
    68 - 79 Nova and 67 - 69 camaro are the same width
    Firebird is 1" wider and 2nd gen camaro and firebird rears are 1" wider.
    SO WHAT THEY HAVE??? Who knows. Send the actual ad to jdrace3@gmail.com
     
  6. Chuck George

    Chuck George Member


    Will the posi unit out of the Nova fit into a 10 bolt 8.5" BOP rear end?
    Thank you.
     
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Chuck 8.5 is 8.5 is 8.5 as far as the gears and Posi go. If the Nova rear is an 8.5, then the guts will fit into the 71-72 Skylark/GS rear.
     
    69GS&M21 likes this.
  8. monzaz

    monzaz Jim

    Yep that is correct. BUT I do not know what they or you are talking about 1" narrower etc on the rear end width??? Nova 8.5 was as narrow as you can get? so that is where the confusion is.
    GUTS - as long as it is a 8.5 all Bolt in axle rears can use ANY AND ALL posi carriers and gears. The c-clip rears MUST stay with a c-clip type Posi carrier or open carrier. gears all fit.
    410409 and 410408 carriers are c-clip carriers
    726 and 725 are the BIA carriers . Which can not be used in a c-clip rear. NO side gear c-clip retention recess machine area for the c-clip to seat into.
    Hope that is clear.
    JD Race
     
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  9. Chuck George

    Chuck George Member

    It is clear, thank you.
     
  10. monzaz

    monzaz Jim

    Try to do as detailed as I can so other can use it for reference down the posi road. :) Jim
     
    Max Damage likes this.
  11. BrianTrick

    BrianTrick Brian Trick

    The rear he had in question is a 73-77 c-clip 8.5” that has been floating around for sale on Craigslist. It is listed as a 69 GTO or 64-72 A-body,but it is actually a 73-77 A-body rear that someone attempted to modify to fit a 64-72. It’s good for the posi unit and gears. Pitch the rest.
     
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  12. monzaz

    monzaz Jim

    Rats...I need the housing unmolested. The guts I do not care about...lol. :/ POOH!
     
  13. Chuck George

    Chuck George Member

    Does this look like it is out of a 71 Cutlass? 10 bolt 1.jpg 10 bolt 2.jpg
     

    Attached Files:

  14. BrianTrick

    BrianTrick Brian Trick

    Yes. That is what you want.
     
  15. monzaz

    monzaz Jim

    Yes 2
     

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