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1972 Riviera Rear End

Discussion in 'Got gears?' started by OldDrummer55, Dec 16, 2020.

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  1. OldDrummer55

    OldDrummer55 Well-Known Member

    I recently purchased a 72 Riviera peg-leg with a built up 455 and would like to upgrade to a limited slip rear end. After reviewing the many threads on this topic, I find the first thing to do is identify what I have... Is this a 9 3/8 rear end?

    72 Riviera Dif.jpeg
     
    OldDrummer55, Dec 16, 2020
    #1
  2. LARRY70GS

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

    LARRY70GS, Dec 17, 2020
    #2
    OldDrummer55 likes this.
  3. flynbuick

    flynbuick Guest

    It is a post 70 BOP 9 3/8" rear. A pre 71 9 3/8" is Buick only and not the same.
     
    flynbuick, Dec 17, 2020
    #3
    OldDrummer55 likes this.
  4. OldDrummer55

    OldDrummer55 Well-Known Member

    Thank you. If I understand the many posts on posi rear ends correctly, an 8.5" GM Corporate posi would bolt right into the housing I have?
     
    OldDrummer55, Dec 17, 2020
    #4
  5. LARRY70GS

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

    No, I think they mean the entire axle. The 8.5 rears came in some big cars, and would bolt in.

    Post number 15 from the second thread I linked,

    Monzaz said,

    "Might as well just use a 10 bolt 8.5 rear same deal and it bolts right in. 1971-1976 10 bolt 8.5 rear is a direct bolt in from any FULL size GM car. riv Electra Catalina Bonneville 98 88 olds etc. Look for the LOW HP motor cars. 350 2 bbl 400 etc. Centurion Chevys Impala Caprice etc should have the 8.5"
     
    LARRY70GS, Dec 17, 2020
    #5
    OldDrummer55 likes this.
  6. OldDrummer55

    OldDrummer55 Well-Known Member

    Thank you Larry
     
    OldDrummer55, Dec 17, 2020
    #6
  7. LARRY70GS

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

    You're welcome Capt. Kelso.:D:D
     
    LARRY70GS, Dec 17, 2020
    #7
    OldDrummer55 likes this.
  8. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    Unless you get lucky and find a posi from a 71-73 big car 9 3/8, you would be better to find an 8.5 from a small block big car and install a posi/gears.
     
    Smartin, Dec 17, 2020
    #8
    OldDrummer55 likes this.
  9. flynbuick

    flynbuick Guest

    Look for a post 70 Oldsmobile wagon rear.
     
    flynbuick, Dec 17, 2020
    #9
    OldDrummer55 likes this.
  10. OldDrummer55

    OldDrummer55 Well-Known Member

    Belushi rocks! “What? Over? Did you say 'over'? Nothing is over until we decide it is! Was it over when the Germans bombed Pearl Harbor? Hell no!...”
     
    OldDrummer55, Dec 17, 2020
    #10
    FLGS400 and LARRY70GS like this.
  11. monzaz

    monzaz Jim

    2 different movies...lol Animal House. Leave him be ...he's on a role!!!

    1941 - Check him for stilts..... Let me hear your GUNS!
    Love them both
    Boy we got off the subject!!! lol
     
    monzaz, Dec 18, 2020
    #11
    OldDrummer55 likes this.
  12. monzaz

    monzaz Jim

    1971 - 1976 all full size cars with 455 motor received this 9.3 / 9 3/8 rear 12 bolt cover 12 bolt ring 31 spline bolt in axles.
    The rear is considered a OLDSmobile rear end.
    YOU can use the gears from a 1965 -1970 BUT you will need the yoke with it and have to change the driveshaft etc...Might be more headache than worth when going out of era.
     
    monzaz, Dec 18, 2020
    #12
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  13. Nailhead in a 1967

    Nailhead in a 1967 Kell-Mnown Wember

    Nailhead in a 1967, Feb 11, 2021
    #13
  14. Luxus

    Luxus Gold Level Contributor

    * Cough* Not all full size 71 - 76 cars w 455 got that axle. *Cough*
     
    Luxus, Feb 11, 2021
    #14
  15. GSX 554

    GSX 554 Gold Level Contributor

    GSX 554, Feb 11, 2021
    #15
  16. GSX 554

    GSX 554 Gold Level Contributor

    Just clarifying . And being a GS does not ensure that it would be a Posi Rear ;)
     
    GSX 554, Feb 11, 2021
    #16
  17. GSX 554

    GSX 554 Gold Level Contributor

    Just pointing out FACT . Don't want to become Confrontational , Combative or Argumentative Eric . It COULD but doesn't have to .
     
    GSX 554, Feb 11, 2021
    #17
  18. GSX 554

    GSX 554 Gold Level Contributor

    Delete when educated . One way out . :):)
     
    GSX 554, Feb 11, 2021
    #18
  19. monzaz

    monzaz Jim

    cough cough You got a hernia...lol.
    This is a discussion forum ...just say what you want nicely.

    We have parted out 1000's of rears and this seems to be the rule of thumb if you want to find a 9.3 you do not look under a 350 or 400 2 bbl.

    Nothing in this world is a guaranteed and since all these cars are well over 40 years ....who knows how many rears these cars went through after people tried to restore repair etc. lol.
    Jim
    JD Race
     
    Last edited: Feb 11, 2021
    monzaz, Feb 11, 2021
    #19
  20. Nailhead in a 1967

    Nailhead in a 1967 Kell-Mnown Wember

    Exactly, and that's why I used the words "it might"...:p:D:cool:

    Anyway: Mark knows about Cole's post now, that's the only thing that really matters [​IMG]
     
    Nailhead in a 1967, Feb 12, 2021
    #20
    OldDrummer55 likes this.
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