70’ 12 Bolt Rear End

Discussion in 'VIN, Trim Tag & Drivetrain Decoding' started by Chevy911, Apr 9, 2021.

  1. Chevy911

    Chevy911 Member

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    Ok guys, if you’ve been following my post I’m trying to give my car the best of the best stuff.
    I found a guy who has a 12 Bolt out of a 70 camaro that he said he brought 30yrs ago at a swap meet. I need help identifying this rear end to determine it it is in fact a REAL 70’ F-body rearend.

    Here are the numbers off of it:
    Front Passenger side: COS 0316G4
    Top rear Driver side: B120
    Bottom front Driver side: 3969341NF
    Top rear Passenger side: C0N2
     
  2. Gary S

    Gary S Administrator Lifetime Gold Member

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    COS is the correct code for a 1970 Camaro 12 bolt with 3.07 gears and no posi. It likely came out of a SS350 with automatic tranny. But, who knows what is inside it today. The gears could easily have been changed and a posi installed.
    The 3968341 casting also identifies it as a 1970 F body diff.
     
  3. Chevy911

    Chevy911 Member

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    What is it worth?
     
  4. badazz81z28

    badazz81z28 Veteran Member

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    Good question....what is it worth? That's question only you can answer lol. Consider if its still a open 3.07, you will need to put $1000 into it to make it a posi with good gears. A "best of the best" option to me is not to invest in a stock 12 bolt that is not correct for your car. I would spend the money on a direct fit Moser 12 bolt.

    If you pay $1500+ for this rear end, and put $1000 into it, plus the money to clean it up...Is it worth it?
     
  5. Rosster

    Rosster Veteran Member Gold Member

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    It’s not a 3.55, 3.73, or 4.10 so value is probably $1000-1500 if it has been updated with lower gears and posi. For $2500 you can get a brand new 12 bolt from moser. If it’s all still stock, $750-$800 would be it’s worth due to costs to upgrade it.
     

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