76 Fleetwood differential upgrade to posi traction
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The Classic Cadillac Forum Discussion, 76 Fleetwood differential upgrade to posi traction in Past Cadillac Vehicle Discussion; Like the title says, im looking to swap the rear out with a posi. I researched a bit and read ...
  1. #1
    Miklo II is offline Cadillac Owners Member
    Automobile(s): '76 FW Brougham d'Elegance (R.I.P.) '76 SDV d'Elegance
    Join Date
    Oct 2012
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    8

    76 Fleetwood differential upgrade to posi traction

    Like the title says, im looking to swap the rear out with a posi. I researched a bit and read that an 8.5 inch from a 80s-early 90s caprice will bolt right in. Is this true? If so what needs to be modified? If not, what cars/trucks with positraction will bolt up to a 76 chassis? And if there isnt any what are my options? Any help is appreciated.

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  3. #2
    DouglasJRizzo is offline Cadillac Owners Enthusiast
    Automobile(s): 1975 hearse, 1976 hearse
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    Franklin Lakes, NJ
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    Re: 76 Fleetwood differential upgrade to posi traction

    I would think that finding a '76 Cadillac so equipped in the wrecking yard would be the easier route and best fit. These are indicated by a sticker on the inside of the trunk lid warning service personnel that the car is so equipped.

  4. #3
    Miklo II is offline Cadillac Owners Member
    Automobile(s): '76 FW Brougham d'Elegance (R.I.P.) '76 SDV d'Elegance
    Join Date
    Oct 2012
    Posts
    8

    Re: 76 Fleetwood differential upgrade to posi traction

    ^^^^ Um not many of these cars can be found at the bone yard down here in AZ. And the one specific i know of is hella expensive. Didnt see any Cadillacs last time i was there. Come to find out Cadillacs with the 8.875 12 bolt differentials are actually TRUCK rear ends. Got under the car and took a pic and it looked just like this one:

    http://www.drivetrain.com/parts_cata...d_pinions.html

    And would you look at that at the bottom of the page LockRight sells one for just under $300.
    Gonna definitely give this a shot.

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