'48 Plymouth Special De Luxe
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Thread: '48 Plymouth Special De Luxe

  1. #1
    Junior Member Second Wind's Avatar
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    '48 Plymouth Special De Luxe

    With my work space slowly coming together I'm hoping to start this project soon. I did want to post some pics of the starter project before I start tearing it down. Also being the new guy we will see how my pic post skills are here. Here's to breaking the ice before Jack Frost settles in. I also added a pic of the straight axle I want to use.

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    Last edited by Second Wind; 10-16-2020 at 10:30 PM.
    48 Plymouth Custom Special - 4dr suicide style
    Starting new build from scratch with plans of:
    1950 Chevy straight axle with steering box
    Ford 9" rear with 4.10's or 4:29 gear
    Mopar 440, 512 CID stroker estimating 680 - 700 hp on pump gas
    727 auto
    30 or 32 inch X 10 wide tires
    guessing at finish weight of 32-3500 pound car
    hoping to run in the 10's

    This project will be the quickest vehicle that I have built so I am really looking forward to it.

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  3. #2
    Administrator 1946Austin's Avatar
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    Looks like a solid car to start with! Is that a 50's Chevy truck axle I see?
    Vall

  4. #3
    Junior Member Second Wind's Avatar
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    The running board/ rocker panels had some interesting repairs and the fenders need some TLC but it is mostly all there. Yes the axle is just that and it will be used for this project. It came out of a 6 cylinder '50. It has 1-3/4" wide springs so I don't know how well a 440 will go with a spring that narrow. If you look close the tie rod looks really awesome! I think getting the drums off will be a chore too. I see a lot of hours going into the front end this winter. A couple of more weeks and the tear down will begin. I tore down a 440 and hope to have a 727 soon so I can start a mock up. Still trying to decide on a width for a floater 9". A goal would be to have a rolling chassis by spring.
    48 Plymouth Custom Special - 4dr suicide style
    Starting new build from scratch with plans of:
    1950 Chevy straight axle with steering box
    Ford 9" rear with 4.10's or 4:29 gear
    Mopar 440, 512 CID stroker estimating 680 - 700 hp on pump gas
    727 auto
    30 or 32 inch X 10 wide tires
    guessing at finish weight of 32-3500 pound car
    hoping to run in the 10's

    This project will be the quickest vehicle that I have built so I am really looking forward to it.

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  6. #4
    Administrator 1946Austin's Avatar
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    With 6 bolt drums, you'll likely need to swap on '49-'54 passenger car drums, or convert to disc brakes. Speedway sells a disc brake kit for these that will let you not only convert to disc brakes, but also 5x4.5" or 5x4.75" bolt pattern. A very good way to go I think.
    The 1.75" springs likely wont be too lightweight, but you might find they're too long to keep behind the front fenders. I usually dump the stock springs, and buy shorter 1.75" wide springs around 29"-30" long. Those springs are 70 years old now anyway, so might be work hardened after that long, and no telling when or if they might crack.
    Vall

  7. #5
    Junior Member Second Wind's Avatar
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    Thanks for the tip, I will be needin' 'em. I knew that new springs would be in the works it's just that getting the right ones that fit the project. I will definitely be going to discs too because of the braking capacity and the bolt patterns. Since I started this project I have ended up at the Speedway site more often than not. Lots of good stuff there.

    On a new note I had a good day today. I picked up a 440 short block and 2 each 727's for $500. Once I get a 9" I can start to make it all work.
    48 Plymouth Custom Special - 4dr suicide style
    Starting new build from scratch with plans of:
    1950 Chevy straight axle with steering box
    Ford 9" rear with 4.10's or 4:29 gear
    Mopar 440, 512 CID stroker estimating 680 - 700 hp on pump gas
    727 auto
    30 or 32 inch X 10 wide tires
    guessing at finish weight of 32-3500 pound car
    hoping to run in the 10's

    This project will be the quickest vehicle that I have built so I am really looking forward to it.

  8. #6
    Senior Member mmhotrod's Avatar
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    I used CJ7 jeep springs, others used speedway springs or trailer springs.
    Mario





    "I post the work on my hotrod, not because it's the best way, rather it was the way I had to get it done with the resources I had.................
    Of which I might be an encouragement to other hotrodders".

  9. #7
    Administrator 1946Austin's Avatar
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    Quote Originally Posted by mmhotrod View Post
    I used CJ7 jeep springs, others used speedway springs or trailer springs.
    How long are CJ7 springs Mario?
    Vall

  10. #8
    Senior Member mmhotrod's Avatar
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    Quote Originally Posted by 1946Austin View Post
    How long are CJ7 springs Mario?
    i have to measure them on the coupe. But they were slightly longer than Chevy stock. I think 33”.
    Mario





    "I post the work on my hotrod, not because it's the best way, rather it was the way I had to get it done with the resources I had.................
    Of which I might be an encouragement to other hotrodders".

  11. #9
    Administrator 1946Austin's Avatar
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    Interesting? The specs for those springs show they're 45" long eye to eye.
    Vall

  12. #10
    Senior Member mmhotrod's Avatar
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    Quote Originally Posted by 1946Austin View Post
    Interesting? The specs for those springs show they're 45" long eye to eye.
    I will check tonight when I’m home. Maybe I’m off. I can’t remember anything anymore.
    Mario





    "I post the work on my hotrod, not because it's the best way, rather it was the way I had to get it done with the resources I had.................
    Of which I might be an encouragement to other hotrodders".

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