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1931 2 Door Sedan - Updated drive train

Discussion in 'Off Topic Hot Rods & Customs' started by 314Door, Dec 1, 2025.

  1. 314Door
    Joined: Nov 12, 2025
    Posts: 2

    314Door

    Hi everyone, I am new to the forum as a member but have read and learned so much from you guys already but I finally got one of my own to customize and could not be more excited! First build so excuse my ignorance or dumb questions.

    I got a full fendered, hood restored 1931 2 door Deluxe in great shape that runs but the wife does not feel safe in it / I also enjoy performance. I am going to keep the body and interior as orginal / untouched as possible.
    My goal is to make this my daily driver as well as a bit safter, more reliable and amore fun with keeping the iconic styling of the time.

    I do not have a huge budget and am wiling to be patient and build it correctly without spending 50k. After doing a bit a research of what it would cost to improve the original engine, frame and suspension I have decided to build what I guess is considered a resto mod hot rod. ( I am going to keep the working rolling chasis and look for a cheap body or truck to put back on it.

    Where I am now: I found an amazing deal on a 65 mustang 289 with a 4 speed trans that I just got running. I also got a boxed in frame, 8 inch rear with coil-overs. I also got a mustang 2 front end / 35-40 ford front end with it.

    I want to keep the fenders & hood but upgrade the drivetrain . technology with what I have now. I got a used speedmaster Serp kit to make the engine as short as possible and pushed it back as far as I could without hitting the Alt/ AC compressor on the heads.

    I would like to modify the firewall as little as possible but am willing to do what I need.

    I would appreicate any insight, advice as I do this transition to fit the engine as clieanly as poissible as well as opinions on the best front end / with as little alterations to the fenders firewall as possible. Here is also a short list I still need to figure out, Thank you in advance for the help!

    Battery Location
    Front end - Mustang 2 or Dropped Straight axel
    Pedals -
    Braking
    Gas Tank & Filler location
    Heating / AC other than vintage air
     

    Attached Files:

    Okie Pete likes this.
  2. Moriarity
    Joined: Apr 11, 2001
    Posts: 39,102

    Moriarity
    SUPER MODERATOR
    Staff Member

    moved to the off topic forum
     
  3. 31Apickup
    Joined: Nov 8, 2005
    Posts: 3,687

    31Apickup
    Member

    You’re going to need to modify the firewall, some reverse it ( take it out and put it in backwards). Go with a dropped axle.
     
    314Door and Dick Stevens like this.
  4. RodStRace
    Joined: Dec 7, 2007
    Posts: 9,741

    RodStRace
    Member

    In order from the edited version.
    Safe is go, stop, steer, then gets into protecting the human cargo.
    This starts with seat belts, a collapsing steering column, can include updated door latches, and at that point it gets into major changes. You can't really build in crumple zones, side protection, air bags and such without major changes to the original car, if at all. Understand this is close to a hundred years old. If you or your spouse require 1990s safety, it isn't going to happen, let alone 2020s safety.

    As said, the solid axle is going to fit better under the fenders. Do some searching for Model As with MII. The results should provide an idea of the expenses and compromises required.

    That engine is going to be a tight fit under the hood. Grab a tape and see if it will work and consider cooling, too. If A/C is a requirement, it's going to take serious work. The firewall flip is going to be the first step, or a replacement, since this isn't HAMB style anyway.

    Pedals - either under floor or up on the firewall. Considering the packaging, probably under floor.
    Braking - You already have rear drums, get discs that fit the front spindles and a master probably with a booster, all sized properly.
    Gas tank - common points are saddle tanks or behind rear seat. Explore your options.
    HVAC - Vintage is the leader in the field. They have been doing it a long time and are proven. If you want other companys, figure out what features you want, if you can reuse the current compressor, and cost plus after sale tech help meets your needs.
    Since you are building more of a modern Street Rod than a typical HAMB style ride, some of your questions won't be answered on the main board, but you can still try searches here for the individual parts and systems. There is some great info.
     
    19Eddy30 and 314Door like this.
  5. 314Door
    Joined: Nov 12, 2025
    Posts: 2

    314Door

    Great advice thank you so much! I have made some good progress.
    After looking more into it I am going to leave my 31 alone and nice and get a new 30 body and drop it on and just have 2 :)

    The engine & trans is mounted and ended up fitting just inside the frame rails nicely!

    I have ended up going with the mustang 2 front end from horton Hot Rod in Canada that mounts the arms outside the frame so the fenders fit. Still working through but have found that the front driver side end of the frame is bent 1/2 low.

    Any suggestions on bending the end 15" upward 1/2"?
    Thank you!
     

    Attached Files:

    Okie Pete likes this.
  6. SS327
    Joined: Sep 11, 2017
    Posts: 4,199

    SS327

    Floor jack with a chain wrapped around it and the frame.
     

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