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Thread: 350TH to 700R4 Swap

  1. #1
    Junior Member SHOW GUEST
    Join Date
    Nov 2006
    Location
    Grosse Ile, MI
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    6

    350TH to 700R4 Swap

    Hello all...

    I have a 1976 Chevy Impala Custom with a stock 350TH tranny. My 383 Stroker (est. 500hp) will be completed in a few weeks, and I would like to swap out the 350TH for a 700R4. Stock rear has been changed to a 8.5" 10 bolt 3.73 POSI.

    Question 1: Can any one recommend a reliable Performance Transmission builder in my area (Downriver, Michcigan)?

    Question 2: Will I need to have my Driveshaft shortened or the Trans support bracket changed out?

    Thank you for your feedback.
    ej
    "Never too old, never too LOUD..."

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003
    Location
    Ohio
    Posts
    935
    I think you would be better off with the TH350 but I would ask an expert on that. Call Dion Vickers. He will help you out. Tell him I told you to call. 330-584-3679.

  3. #3
    Junior Member APPRENTICE
    Join Date
    Dec 2007
    Posts
    11

    Re: 350TH to 700R4 Swap

    Quote Originally Posted by ejohnson03

    Question 1:

    Question 2: Will I need to have my Driveshaft shortened

    YES

    or the Trans support bracket changed out?

    YES

  4. #4
    Senior Member EXPERT BUILDER
    Join Date
    Aug 2007
    Location
    Orient, OH
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    384
    500hp + Heavy car + 700r4 = Parts flyin.

    I have never had any luck with 700r4's.

    I would suggest building the 350 turbo up.
    Josh VanHorne

    1964 Chevy Nova
    Worlds quickest and fastest tow truck. (9.92 @ 137)

    http://static.racingjunk.com/63/ui/7...247837-479.jpg

    http://www.racingjunk.com/profile/211708

  5. #5
    Junior Member SHOW GUEST
    Join Date
    Nov 2006
    Location
    Grosse Ile, MI
    Posts
    6

    Which Tranny

    Well...

    I had considered the 700R4 based on the lower gear ratio in First, and the overdrive gear for highway cruising.

    Since my highway miles will be very limited, the 350 could do if I can get it to hold up to the extra HP.

    The biggest task then becomes finding a reputiable source locally to get a Built up 350TH.

    Especially after reading about Mad Dog or who ever they are now...

    Thanks for your posts.
    ej
    "Never too old, never too LOUD..."

  6. #6
    Senior Member RACING JUNKIE
    Join Date
    Jun 2003
    Location
    Hobbs, NM
    Posts
    842
    If you can get a core you might think about building a turbo 400. More parts available and even tougher than the 350. Just and idea.

  7. #7
    Member JUNIOR BUILDER
    Join Date
    Aug 2007
    Location
    Odessa Texas
    Posts
    81
    You can build a bullet proof 700R4, but it is very expensive. Your looking to spend around 2500 to 3000 for trans and converter.
    You should look into a 4L80E.


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