Gear Vendors in a '67 Barracuda, is tunnel clearancing required?

Transmission and Drivetrain Tech

  1. GRANCUDA

    GRANCUDA Well-Known Member

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    I am about to pull the trigger on getting a Gear Vendors OD for my '67 383 Barracuda. I know they just bolt into a B & E body but what about an A-body, is the tunnel just as wide as the B/E tunnels?
     
  2. DesertRat

    DesertRat Well-Known Member

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    No, takes work.
     
  3. 67Dart273

    67Dart273 FABO Gold Member FABO Gold Member

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    ........and I bet sweat, blue words, and sheet metal......?
     
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    • GRANCUDA

      GRANCUDA Well-Known Member

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      I've just now looked up some on the forum to see what modifications need to be done & if you aren't trying to get the car down in the weeds it looks like it's a bolt in. I'm running super stock springs in factory hangers so it's pretty high in the back.
       
    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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      If a manual trans;
      1) the adapter they sell you is for a long shaft, So you have to convert your tranny.
      2) the adapter has both B and E body shifter pads on it so you have to saw the top frontmost pad off.
      3) the driveshaft will have to be shortened.
      4) because the unit puts the rear yoke quite a bit further towards the back, it messes up your driveshaft angles. My partial solution was to jam the unit into the floorpan and add shims at the rear trans mount. By jamming it in there I found the witness marks in the tunnel,and,after pulling the unit down, I carefully pounded out an area suitable to receive it. Of course this required clearancing that front pad again.
      5) is the shifter; the factory one won't fit any more. You can fabricate an adapter to bring the shifter back into the floor hole, or you can take this opportunity to move she shifter back between the buckets. Of course that will then require new shift rods.
      6) is adjusting the pinion angle cuz now it's out of whack too.
      7) is the speedo. They supply an adapter to take the drive from the GV but you have to get the right GM speedo gear.
      8) is the special oil you need to run in it. Buy extra.
      9) is locating and wiring their ECU, and that ugly-azz truck shifter

      If an automatic
      skip 1,2, and 5
       
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      • DesertRat

        DesertRat Well-Known Member

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        I had clearance issues with my 273/904 combo and stock rear suspension in my 67 barracuda.
        Be interesting with a big block/727. My details are in my build thread.
         
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        • Jax340Dart

          Jax340Dart Well-Known Member

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          On mine 340/727 combo, I had to "adjust" the tunnel in two small areas. Gear Vendors said to use a ball peen hammer, I used a blount end air chizel and it only took a few minutes. When youre finished make sure you can slide some cardboard between the tunnel and the GV in the places where it is tight to make sure it clears. Bob
           
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          • GRANCUDA

            GRANCUDA Well-Known Member

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            Well it only took a year & a few months to decide on a Gear Vendors. Hopefully get it in this weekend & get the driveshaft made next Monday.

            2A014B2E-78C6-4C52-859D-CD7FEF6CD942.jpeg
             
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            • Fast340cuda

              Fast340cuda Well-Known Member

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              Nice! The Gear Vendor has been the best upgrade so far on my 68.
               
            • DrCharles

              DrCharles Well-Known Member

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              I'll consider buying a GV when they make an adapter that bolts onto an A-body A833 without rebuilding the entire trans into a B-body mainshaft...
               
            • Fast340cuda

              Fast340cuda Well-Known Member

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              I consider myself lucky as I scored a rebuilt 833 E body trans with a new gear vendor unit installed for $2k.
               
            • DesertRat

              DesertRat Well-Known Member

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              No need to say it but read the book until you can recite it. I built two drivelines because the first one was too short and I missed it in the book. Aside from that my GV has been flawless.
               
            • Kent mosby

              Kent mosby FABO Gold Member FABO Gold Member

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              Do you happen to have any pictures of your gear vendors clearancing??? What tool you used and where?
               
            • kursplat

              kursplat FABO Gold Member FABO Gold Member

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              HERE'S my 68' valiant for comparison
               
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              • John Trickler

                John Trickler Member

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                On my 67, went from /6 to small block 727 with GV. Had to cut and open up the tunnel. wasn't planned on, GV told me it would fit.
                 
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                • kursplat

                  kursplat FABO Gold Member FABO Gold Member

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                  i don't think anyone the answers those questions at GV knows the difference between an mopar a-body and a gm a-body.
                   
                • RogerCox

                  RogerCox Well-Known Member

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                  I have a 67’ cuda, have a 408 stroker and 727 coming from blueprint engines. Was thinking 323 gears (Dana 60), and hoping the near 500hp would help on the low end and 323 would be good for 75-80mpg hw driving.

                  Would I see a dramatic increase using a GEar vendor set up?

                  what’s your set up and still really happy with everything?
                   
                • Fast340cuda

                  Fast340cuda Well-Known Member

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                  I’m running a 372 CID small block (340 block, 4.06” bore, 3.58” stroke) with a 4 speed manual and 3.91’s out back. The gear vendors turns my rear ratio into a 3.0ish gear when engaged and allows me to cruise comfortably on the freeway.

                  I would not run 3.23’s with my combo but I’m running a fairly large solid flat tappet cam and an LD340 intake with the plenum divider partially removed so it is not a torque monster and likes a bit of RPM. Your 408 should make more torque so 3.23’s around town may not be that bad.

                  I am still very happy with the unit and chose this path as I did not want to modify my cross member or trans tunnel to install an overdrive. My install only required some minor grinding to the gear vendor adaptor and a few small dimples in the trans tunnel.
                   
                • RogerCox

                  RogerCox Well-Known Member

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                  Okay good info! What gears would you use for 408 and 727 with GV? 3:91?
                   
                • Fast340cuda

                  Fast340cuda Well-Known Member

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                  What do you plan on running for a cam and intake? Do you plan on more highway driving or more around town?
                   
                • RogerCox

                  RogerCox Well-Known Member

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                  Using this: BluePrint Engines Builder Series Mopar 408CI Stroker Crate Engine and 727 Auto Transmission | Small Block Chrysler | Roller Cam | Black Front Accessory Drive

                  Will be 50/50 highway and street, ideally I’d like to not have to spend another 3k lol. That’s why I was originally just thinking 3:23 from Dr Diff but don’t want it to be a slouch off the line. Thanks for the help!
                   
                • AJ/FormS

                  AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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                  I have a HO367 with a Commando A833, and a GVod behind it. I have run just about every rear gear from 2.76 to 5.13s, and 3.55s have been in it since about 2005. If I had an automatic , It would be an A999/Loc-up, with a 2800TC and I would for sure try 3.23s This would make the starter gear to be 8.85, a very good street starter for an automatic and a SBM.
                  With your 727, the starter gear will be 7.91, but your stroker will have considerably more torque at stall than my 367, so it should in no wise be a slouch, off-the-line with 3.23s. And with them, 65=2519 at zero-slip, say up to 2650 on the tach @5% slip, with 28" tires. For a streeter that is pretty good.
                  The only part I don't like with the 3.23s and a 727, is that 60 mph is around 6800 in first/3800 in second, so some punk with a 4 speed and a 367, geared right, might pzzuoff. So just stay from 4-speeders, and you'll be fine.
                  The good news is 3.23s are about the right gear to trap the 660 in, hitting about 5750@93/ to 5950@96
                   
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