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GM B-Body Forum, 77-79 Caprice/Impala Forum

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GM B-Body Forum, 77-79 Caprice/Impala Forum

A forum for the owners and enthusiasts of General Motors B-Bodies from 1977-1990, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


3 posters

    rear end swap

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    Bill "elvis"
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    Post  Bill "elvis" Thu Jun 16, 2016 12:19 pm

    will 1973 to 1977 a/g body rear ends swap into my 1979 impala?? just read the frames where all the same for those years and the rear end's are interchangeable. my buddy has a 1974 olds cutlass supreme that has seen its better days. its a parts car but the rear end is there. will this work??,....thanks,bill
    Sweet Seventy9
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    Post  Sweet Seventy9 Fri Jun 17, 2016 9:51 am

    No. Shock and spring perches are different.

    Here's what fits.

    https://www.gmbbodyforum.com/t314-rear-axle-interchange?highlight=rear+end
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    Bill "elvis"
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    Post  Bill "elvis" Fri Jun 17, 2016 10:20 am

    thanks for the info. these people who post stuff like that shouldn't post if they don't know for sure. there is just so much miss leading info out there. again,...thanks for the help.
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    Bill "elvis"
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    Post  Bill "elvis" Sat Jun 18, 2016 11:30 am

    ok,.....so last night I ended up buying my buddies parts car. it is a 1975 olds cutlass supreme. bucket seats with a console. 10 bolt rear end. this morning I measured the rear end and re-measured and measured again. it is the exact same. spring perches, controlling arm's mounts, shock mounts and width, all the same. it is exact!! thoughts??
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    Post  Sweet Seventy9 Sat Jun 18, 2016 2:17 pm

    Bill \"elvis" wrote:<snip> thoughts??

    You need a new tape measure?? LOL! JK. Laughing

    That swap has been asked about many times before.
    There's a thread on here somewhere explaining the differences.


    The seats and console will look absolutely fantastic in your car.
    The engine probably has close to 100 more horsepower than your current one too.

    Check out B-bodys Caprice to get an idea of how good the consoles look in our cars.

    https://www.gmbbodyforum.com/t558-bucket-seat-center-console-project
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    Bill "elvis"
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    Post  Bill "elvis" Mon Jul 04, 2016 9:38 am

    ok, today I find out if I need a new tape measure, lol. according to every thing I measured the rear end out of the 1975 cutlass should be a direct bolt in. I will let you guys know if it works.


    Last edited by Bill "elvis" on Tue Jul 05, 2016 9:55 am; edited 1 time in total
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    Bill "elvis"
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    Post  Bill "elvis" Mon Jul 04, 2016 4:22 pm

    ok here is the deal,... I bought a 1975 olds cutlass supreme to get the rear end for my 1979 impala.  I did all the measurements, and it looked like it would bolt right into my 1979 impala. I took my chances, I measured good and accurately and had the 1975 olds 10 bolt 8.5 rear end rebuilt. new posi, with 3.73 gears. painted it  black and today was the day for the install. I took out the 7.5 rear end out of the impala and slid the new rebuilt 1975 olds rear end up underneath the car. jacked it up and it bolted right in no problems. the 1975 rear end is now in the car. I do have to shorten the drive shaft about an inch looks like. other than that it was a direct bolt in. any questions feel free to ask. it was easy to do!!
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    Post  terry cronk Tue Jul 05, 2016 4:21 pm

    Glad to hear that. I was never sure to tell someone something that I wasn't sure.

    Way to go.

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