1. Scott Engelhardt

    Scott Engelhardt FBBO Gold Member FBBO Gold Member

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    Anyone here running a GV overdrive? Thinking about one for my Satellite.
     
  2. diesel_lv

    diesel_lv FBBO Gold Member FBBO Gold Member

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    I have one in my '67 Coronet w 610 hp 496" n torqueflite 727. I use it purely as overdrive in Drive. Works great. But does require massaging the tunnel. A slightly curved air hammer head and a bit over 1/4" of massaging works.
     
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    • Scott Engelhardt

      Scott Engelhardt FBBO Gold Member FBBO Gold Member

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      That’s one of the things I was worried about, I don’t really want to have to massage anything.
      Thanks for your reply
       
    • 493 Mike

      493 Mike FBBO Gold Member FBBO Gold Member

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      I have 2 GV units and I enlarged both tunnels with a larger diameter section to fit them in.
      Mike
       
    • Mattias

      Mattias Well-Known Member

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      I´m thinking of installing a GV unit in my car. Currently the car is in rotiserrie for restoration so "massaging" of the tunnel is not a big issue. However, I would prefer to do the necessary tunnel work before blasting and painting of the body.

      Anybody having good pictures of the GV installation and the needed tunnel work?
       
    • Hemirunner

      Hemirunner Well-Known Member

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    • Mattias

      Mattias Well-Known Member

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    • 493 Mike

      493 Mike FBBO Gold Member FBBO Gold Member

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      The conversion on my 65 Belvedere:
      IMG_1586.JPG
      I started here but did not like the transitions so, I went here:
      IMG_2162.JPG
      And I incorporated a drive shaft loop:
      IMG_2216.JPG
      After Raptor bed liner:
      IMG_2280.JPG
       
      Last edited: Jan 14, 2022
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      • Mattias

        Mattias Well-Known Member

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        I can see you did not go the massaging way... but looks good!
        Do you know if there is less space in the tunnel in -65 than -66?
         
      • Hemirunner

        Hemirunner Well-Known Member

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      • 493 Mike

        493 Mike FBBO Gold Member FBBO Gold Member

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        I really did not have a reason for that but, having the springs moved inboard takes some of the stress off that area. The front boxes were an afterthought and easy to fabricate.
        Mike
         
      • 493 Mike

        493 Mike FBBO Gold Member FBBO Gold Member

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        Oh yes there is. I have a GV OD in my 66 Belvedere SW too. I blew out the tunnel on that install but, it doesn't look nearly as nice.
        Mike
         
      • HALIFAXHOPS

        HALIFAXHOPS MSGT(ret) and MOPAR only distributor rebuilder! FBBO Gold Member

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      • ckessel

        ckessel Well-Known Member

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        Mike, I need to redo my tunnel like yours. Had already planned that when I get to that area. I originally went after it using a hammer faced bit on my air chisel and just massaged the tunnel around. It clears but looks like poo and there are a couple of tears.
         
      • 493 Mike

        493 Mike FBBO Gold Member FBBO Gold Member

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        I farmed out the tunnel forming to a sheet metal fab shop I use. If I recall correctly, I specified a 9 1/4" diameter. I used 18 gauge but, it proved easy to dent, so be careful. I extended the front to cover the rear of the trans hump and welded in a filler piece on the bottom (sort of a horseshoe shape) to box in the gap. That way the torsion bar cross member was left intact.
        Mike
         
      • Demonic

        Demonic Well-Known Member

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        Pick up this months issue of Hot Rod. They have an article on GV.
         
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