1969 Deville rear axle?
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 1969 Deville rear axle? in Past Cadillac Vehicle Discussion; I'm purchasing a 69 Deville convertible, and would like info and specs on what type of rear axle this is. ...
  1. #1
    trirotor is offline Cadillac Owners Member
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    1969 Deville rear axle?

    I'm purchasing a 69 Deville convertible, and would like info and specs on what type of rear axle this is. I am planning performance mods, (+300 hp over stock) and am concerned with strength of the rear axle. Ring gear size? axle strength? Parts availability? Posi carrier? I've raced Chevy most of my life, but I am completely lost on finding info on this rear axle. I'm starting to think it's poor for performance. How would you rate it compared to a corporate 12 bolt?
    Thanks for your input.

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    77CDV's Avatar
    77CDV is offline Cadillac Owners Master
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    Re: 1969 Deville rear axle?

    Went through the applicable sections of the factory service manual for you, and all I can tell you is that the standard gear ratio is 2.94:1 and that controlled rear differential was optional, noted with a "G" preceding the rear axle ratio code stamped on the housing. No other information is noted. I'm afraid I can't comment on the relative strength of the standard 1969 Cadillac axle versus a corporate 12 bolt model.

    Good luck with your build.

    Craig

  4. #3
    Aron9000's Avatar
    Aron9000 is offline Cadillac Owners Master
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    Re: 1969 Deville rear axle?

    Quote Originally Posted by 77CDV View Post
    Went through the applicable sections of the factory service manual for you, and all I can tell you is that the standard gear ratio is 2.94:1 and that controlled rear differential was optional, noted with a "G" preceding the rear axle ratio code stamped on the housing. No other information is noted. I'm afraid I can't comment on the relative strength of the standard 1969 Cadillac axle versus a corporate 12 bolt model.

    Good luck with your build.

    Craig
    I thought Cadillac used standard GM corporate axles. I know the one in my 1991 Brougham is the good old 8.5" 10 bolt.

  5. #4
    Aron9000's Avatar
    Aron9000 is offline Cadillac Owners Master
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    Re: 1969 Deville rear axle?

    Quote Originally Posted by 77CDV View Post
    Went through the applicable sections of the factory service manual for you, and all I can tell you is that the standard gear ratio is 2.94:1 and that controlled rear differential was optional, noted with a "G" preceding the rear axle ratio code stamped on the housing. No other information is noted. I'm afraid I can't comment on the relative strength of the standard 1969 Cadillac axle versus a corporate 12 bolt model.

    Good luck with your build.

    Craig
    I thought Cadillac used standard GM corporate axles. I know the one in my 1991 Brougham is the good old 8.5" 10 bolt, 3.08 gears, no posi(man I wish it had a posi, last car had one and it was so much fun for donuts in a wet parking lot).

  6. #5
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: 1969 Deville rear axle?

    I think that rear end is every bit as strong as a Chevy 12 bolt but it may be harder to find lockers and gears for it. Then again it may be possible to mix 'n match some GM hardware in there.

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