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A forum for all the owners and enthusiasts of General Motors B-Bodies from 1965-1996, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


    78 Catalina rear end

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    krown89
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    78 Catalina rear end

    Post  krown89 on Wed Dec 10, 2014 3:32 am

    My rear end snap one day after smashing on the gas so i got one from a salvage yard for cheap. Its out of a 85 buick lesabre. they had two under a 79 bonneville that were 250. i just took the cheap route. wanted to know if it was a bad choice and are there any other b body rear ends that'll fit my catalina
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    GM B-Body Forum
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    Re: 78 Catalina rear end

    Post  GM B-Body Forum on Wed Dec 10, 2014 10:24 am

    Welcome to the forum! Yes any rear end from 1977-1996 in any b body will fit, it just depends on which one you got. They made the 7.5", 8.5" 10 bolts and the ultra rare 8.75" 12 bolt rear ends. Im assuming since you broke the rear end and if the car is stock, you might have had the 7.5 rear end, those werent very strong, the 8.5 is alot lot stronger. The 8.75 is even bigger and stronger but it was only made for a few years and parts for it are next to impossible to get. Ive only ever seen the 8.75 under impalas, both station wagon and sedan.
    Heres a topic on how to id them: https://www.gmbbodyforum.com/t333-how-to-id-your-rear-end-gm-10-12-bolts-7-5-8-5-8-75-8-875#1928


    _________________
    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
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    Sweet Seventy9
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    Re: 78 Catalina rear end

    Post  Sweet Seventy9 on Wed Dec 10, 2014 11:08 am

    I think you're the first Catalina driver here! Welcome to the forum.

    For rear ends, here's what to look for under the 91-96s:

    Axle Ratio RPO Code.                   Application
     2.56          GM8                    Std. Roadmaster LT1
     2.73          GU2                     Std. Caprice L99 (exc. 9C1)
     2.93          GW9/GU3            Std. Caprice LT1 (exc. 9C1), Opt. Roadmaster LT1
     3.08          GU4                    Std. Caprice 9C1/LT1 (Police), Std. Impala SS
     3.23          GU5                     Opt. Caprice L99, Std. Caprice 9C1/L99 (Police)
     3.42          GU6                     Std. 91-93 Caprice 9C1/L05, Std. 94+ Fleetwood w/V4P
     3.73          GT4                     Std. 91-92 Fleetwood Brougham w/V4P

    *V4P = 7,000 lb. trailer towing package... look for a hitch.


    _________________
    1977 Impala Landau x1.
    1977 Caprice Coupe x3, Sedan x2
    1978 Caprice Coupe x2.
    1978 Impala Landau x1, Station Wagon x1
    1979 Caprice Coupe x4, Landau x4, Estate Wagon x1.
    1979 Impala Coupe x2
    1981 Impala Coupe
    1983 Caprice Sedan
    1984 Caprice Landau x1, Caprice Sedan x1
    1985 Caprice Coupe x1, 1985 Caprice Landau x3
    1987 Caprice Landau
    1989 Caprice Sedan 9C1 x4
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    krown89
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    Re: 78 Catalina rear end

    Post  krown89 on Thu Dec 11, 2014 1:04 am

    Great information. Thanks for the help
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    Re: 78 Catalina rear end

    Post  GM B-Body Forum on Thu Dec 11, 2014 10:08 am

    No problem, how did the rear end break? Im curious.


    _________________
    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
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    Myloth
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    Re: 78 Catalina rear end

    Post  Myloth on Thu Dec 11, 2014 2:55 pm

    Hi welcome. It don't it take much I snapped 2 Chrysler 8.25s in different cars pretty easily with just a little

    enthusiasm on the pedal of healthy 4bbl 318s. I just swapped my 7.5 for a POSI 8.5 from a 94 Buick Roadmaster

    and have no regrets at all.

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    krown89
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    Re: 78 Catalina rear end

    Post  krown89 on Fri Dec 12, 2014 1:04 am

    actually got rear ended and it been humming ever since. Then one day i stood up on the gas while turning and it snapped and starting thumping really hard. It has a pontiac 400/TH350
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    Myloth
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    Re: 78 Catalina rear end

    Post  Myloth on Fri Dec 12, 2014 1:39 pm

    Ow that hurt, sounds like internal damage to an axle from the hit.

      Current date/time is Fri Apr 28, 2017 12:26 am