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Technical 348 Transplant: Transmission Suggestions

Discussion in 'The Hokey Ass Message Board' started by Al T, Apr 20, 2022.

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  1. Aluminum Powerglide

    0 vote(s)
    0.0%
  2. Turbo 350

    0 vote(s)
    0.0%
  3. 700R4

    5 vote(s)
    55.6%
  4. ??

    4 vote(s)
    44.4%
  1. I've recently purchased a '58 Parisienne that is a 261 & Powerglide car. I've picked up a rebuilt '61 Pontiac 348 and will be doing an engine swap soon. It's my understanding the 6 cylinder iron Powerglide will not work with the 348? What would be recommended for a transmission? Aluminum Powerglide? Turbo 350? 700R4? I'd like to keep the swap as simple as possible. I've got a 58 V8 parts car that I can salvage the engine mounts from. Thanks in advance.
    IMG_4740.jpg IMG_4880.jpg IMG_4757.jpg IMG_4760.jpg
     
  2. Overdrive for sure
     
    Truckdoctor Andy likes this.
  3. What am I going to need to consider if I go with a 700R4?
    Will I need to change the yoke on the driveshaft?
    Will I need to have the driveshaft shortened/lengthened?
    Relocate the crossmember?
    What flexplate and torque convertor?
    What do I do about the shifter cable on the 7700R4 vs. the current shifter linkage?
    Will I still be able to have a kickdown?

    Is there a better OD option than a 700R4?
     
    Last edited: Apr 20, 2022
  4. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,246

    gimpyshotrods
    ALLIANCE MEMBER

    700R4.

    It has a nice low first gear to get that ship underway.
     
    SS327 and Truckdoctor Andy like this.

  5. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,246

    gimpyshotrods
    ALLIANCE MEMBER

    You will need a different transmission yoke, as is the case with any option.
    You will need to have your driveshaft shortened, as is likely the case with any option.
    You will need to move the crossmember, as will all options.
    The flexplate will need to match the tooth count that the starter for the 348 needs.
    The torque converter is specific to a 700R4, it has a lock-up clutch in it. A stock stall speed should be fine.
    You should be able to do some minor modifications to your existing shifter linkage to get it attached. I cannot say if you will be able to access 1 and 2 in the shifter pattern with the existing shifter without additional modifications, but you should be able to get P, R, N, OD, and D.
    The 700R4 has a Throttle Valve cable (TV). While it does indeed provide kickdown functions, it is very dangerous to think of it as that. It controls the line pressure in the transmission. As such, it needs to be set up properly. That's not hard to do. Being careless and not doing it properly will kill the transmission by the second stop sight that you reach, on the first test drive.

    The 2004R would work too, but they are getting harder to source. Also, it does not have the same deep first gear that would be of benefit here.
     
    Last edited: Apr 20, 2022
  6. Moriarity
    Joined: Apr 11, 2001
    Posts: 23,308

    Moriarity
    SUPER MODERATOR
    Staff Member

    the answer is soooo clear to me...... FOUR SPEED MANUAL
     
  7. chop&drop
    Joined: Oct 11, 2006
    Posts: 545

    chop&drop
    Member

    If simplicity is your goal I’d go TH350 but with a little more effort the 700R4 is a great driving and cruising trans. The overdrive is really nice.
     
    gimpyshotrods likes this.
  8. 1320 Fan
    Joined: Jan 6, 2009
    Posts: 111

    1320 Fan
    Member

    If the floor pan/tunnel has room 700r4. if not 200r. The od trans is the best money I ever spent on my El Camino. 20% mileage gain over th350. Also want 3.0 to 3.25 rear axel ratio.
     
  9. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,246

    gimpyshotrods
    ALLIANCE MEMBER

    The cast Iron Powerglide was a little chonky in the middle. There might be room for a 700R4 where it was.
     
    bchctybob likes this.
  10. Budget36
    Joined: Nov 29, 2014
    Posts: 8,742

    Budget36
    ALLIANCE MEMBER

    Do you know the rear gear ratio you have now? I/e I have a pu with 3.08 rear, with 28/29 inch tall tires. I don’t have a need for an OD transmission.
     
    bchctybob likes this.
  11. 41rodderz
    Joined: Sep 27, 2010
    Posts: 6,361

    41rodderz
    Member
    from Oregon

    “rebuilt Pontiac 348”
     
  12. Tickety Boo
    Joined: Feb 2, 2015
    Posts: 1,483

    Tickety Boo
    Member
    from Wisconsin

  13. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,246

    gimpyshotrods
    ALLIANCE MEMBER

    Yes, and he's not incorrect.

    The 348 was an available engine in a 1961 Pontiac Parisienne, just no bowtie on the valve cover.
     
    Almostdone and Tman like this.
  14. ???
     
  15. Thanks. Beat me to it. lol

    …… and a 58 Parisienne.
     
    Tman likes this.
  16. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,246

    gimpyshotrods
    ALLIANCE MEMBER

    "I've picked up a rebuilt '61 Pontiac 348 and will be doing an engine swap soon."

    If it did not have Chevrolet-specific valve covers, your statement could be 100% true.
     
  17. goldmountain
    Joined: Jun 12, 2016
    Posts: 3,595

    goldmountain

    A Parisienne just looks like a Bonneville; its Canadian.
     
    gimpyshotrods likes this.
  18. I put a 200 R4 behind my 348.
     
    gimpyshotrods likes this.
  19. choptop40
    Joined: Dec 23, 2009
    Posts: 4,264

    choptop40
    ALLIANCE MEMBER

    turbo 350 .....
     
  20. Agreed. Lots happens in 64 years. Pontiac 348’s had smooth covers. I’ve got a set on the way.
     
    gimpyshotrods likes this.
  21. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,878

    oldiron 440
    Member

    That 348 is going to be hard to make look Pontiac!
     
  22. Dave Downs
    Joined: Oct 25, 2005
    Posts: 915

    Dave Downs
    Member
    from S.E. Penna

    My ‘58 Chevy convertible ended up with a Dual-range Hydramatic behind a 3-carbed 348 - that big heavy car launched really nice!

    ……really impractical combination today…….
     
  23. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,246

    gimpyshotrods
    ALLIANCE MEMBER

    He has smooth covers on-the-way. That was the only difference when it was found in the Pontiac, except for maybe the air cleaner sticker.
     
  24. As a bit of an educational exercise, in the 50’s…… and running until I think the early 70’s, due to Canadian tariffs, GM Canada built its own line of Pontiacs. The Parisienne was one of them. Started in 58, it was built on a Chevrolet chassis with most Chevrolet engine options other than a 261 6 cylinder rather than a 235. The Parisienne really is a Bonneville on a smaller Chevrolet chassis. Other cars unique to Canada off the top of my head are the Beaumont (Chevelle) and Acadian Canso (Nova).
    Here’s a beautiful ‘58 Parisienne convertible with 348. 5DAD5FA1-114E-41EB-8CDA-C0026A2C00C4.jpeg 23304F9E-0259-4FF8-9C2B-A310E0ED10EF.jpeg B6D4F29E-F16C-4A63-8880-D4035BF71A7B.jpeg
     
    guthriesmith and oldiron 440 like this.
  25. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,878

    oldiron 440
    Member

    I didn’t realize that the 348 was in Pontiacs also.
     
  26. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,246

    gimpyshotrods
    ALLIANCE MEMBER

    They, and the later the 409, got snuck in there.
    upload_2022-4-20_16-53-18.png
     
    Al T likes this.
  27. oldiron 440
    Joined: Dec 12, 2018
    Posts: 2,878

    oldiron 440
    Member

    It’s funny how GM got into trouble in the seventies for doing the same thing, putting chevy and Olds engines in Pontiacs and Buicks.
     
    SS327 likes this.
  28. jimmy six
    Joined: Mar 21, 2006
    Posts: 11,248

    jimmy six
    ALLIANCE MEMBER

    I’d put a 3 speed auto or a 3 OD behind the the 261 with an adapter from Buffalo Enterprises. A 261 divided by 6 equals 43.5 times 8 equals 348. Sounds reasonable for a Inliner to me…
     
    Al T likes this.
  29. There’s a 409 Pontiac for sale up here right now. Under $60k CDN. Would be under $50k US.
    76F98BDE-E87A-405F-9F14-5FB7F27D65A2.png
    For comparison, here’s my ‘58 Parisienne convertible and my ‘58 Impala….. both on the same chassis.
    C25F10A9-A790-43C8-8970-2E410002386B.jpeg D05A49CA-F6B6-4C07-84BB-98F5DD5C94C0.jpeg 7F7A444D-C229-4A8C-8057-9427888F85AB.jpeg
     
    Last edited: Apr 20, 2022
    Almostdone likes this.
  30. That’s good math!
     

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