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  1. #1
    Join Date
    Nov 2012
    Posts
    5

    Default Transmission Tunnel Construction

    Hi,

    I Was wondering if anyone can give any tips for constructing a new transmission tunnel in a race car.

    The car is FWD so the tunnel is only for the exhaust pipe. We need to remove the existing tunnel which is too small for the exhaust/oil lines etc which will run down the centre.

    We will replace it with one which is larger, and I was wondering if anyone could give some tips on tig welding the new tunnel to the existing floorpan. would one tig weld along the full length of the tunnel (from the firewall to where the floor pan kicks up for the rear seats etc) or would you stitch weld it?

    Cheers

  2. #2
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,913

    Cool

    I have welded in a few of them. Mig welded soild to keep the fumes out. I suppose you could stitch it and use a sealer. Why tig weld?...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  3. #3

    Default Transmission Tunnel Construction

    We built a pro-street car a few years ago, mig welded, cleaned up the welds then 3M brush able seam sealer then paint. It looked factory and held up to body flex= no cracks.

  4. #4
    Join Date
    Nov 2012
    Posts
    5

    Default

    Quote Originally Posted by aametalmaster View Post
    I have welded in a few of them. Mig welded soild to keep the fumes out. I suppose you could stitch it and use a sealer. Why tig weld?...Bob
    I originally wanted to use gig as it was cleaner/neater... would using a tig be a bad idea?

  5. #5
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,913

    Cool

    Quote Originally Posted by Bosco26 View Post
    I originally wanted to use Tig as it was cleaner/neater... would using a tig be a bad idea?
    You can use what ever process you want. If it is steel i would use a mig and .024 wire but thats just me speaking. Post some pics when you are done...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  6. #6
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,860

    Default

    I think it would depend mainly if it will be structural or not wether to stitch or full weld. A uni-body uses the tunnel for support/strength. Now if the car has it's own frame or cage then it most likely isn't structural. Without pics it is hard to even give an opinion.
    MM250
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  7. #7
    Join Date
    Jul 2010
    Location
    Niagara on the lake Canada
    Posts
    12

    Default tranny tunnel

    make it out of cardboard and duct tape. When you are happy cut out and fab with sheet.

  8. #8
    Join Date
    Nov 2012
    Location
    Northern Arizona
    Posts
    500

    Default

    x2 on the cardboard mockup. I'd seal it up with fully welded seams with a mig. Whats the material?
    MillerMatic 251
    CST 280 w/tig torch (for sale)
    Cutmaster 42
    Victor Journeyman OA

    A rockcrawler, er money pit, in progress...

  9. #9
    Join Date
    Nov 2012
    Location
    Northern Arizona
    Posts
    500

    Default

    x2 on the cardboard mockup. I'd seal it up with fully welded seams with a mig. Whats the material?
    MillerMatic 251
    CST 280 w/tig torch (for sale)
    Cutmaster 42
    Victor Journeyman OA

    A rockcrawler, er money pit, in progress...

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