1. ‘72 Demon

    ‘72 Demon Active Member

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    What parts would be needed to convert a 3 speed manual floor shift to a 4 speed? It’s for a 72 Demon with 318. Thanks.
     
  2. el5dart

    el5dart Well-Known Member

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    trans and shifter
     
  3. JBurch

    JBurch FABO Gold Member FABO Gold Member

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    A transmission, shifter and linkage, correct length drive shaft, maybe a different bell housing. I say maybe as your's may be dual pattern for both 3 and 4 spd transmissions. You'll need to get under the car and look.
     
  4. ‘72 Demon

    ‘72 Demon Active Member

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    Thanks for the info. Doesn’t sound like too much trouble to convert.
     
  5. AJ/FormS

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

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    Piece of cake and your teener is gonna love the short splits.
    If you get an opportunity to obtain an early-A box with the 3.09 low gear, your teener is gonna love that even more. However the early-A comes with a Ball and Trunion drive flange that has to be converted at additional expense,namely a different mainshaft and extension.
    EDIT; between the A230 and the A833,from 67 up,I'm pretty sure the driveshaft length is the same.
    Not sure about the slip-yokes.
    My early-A, with the large diameter mainshaft installed, seems to be every bit as strong as the 2.66low box.
    I haven't been able to blow it up...yet.
     
    Last edited: Jun 23, 2018
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    • JBurch

      JBurch FABO Gold Member FABO Gold Member

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      The car is a 72, not need to worry about B & T drive shaft
       
    • 65 Dartman

      65 Dartman FABO Gold Member FABO Gold Member

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      Or use the conversion driveshaft as outlined at the early Barracuda website. That’s what i’m Using with my 65 ball and trunnions 833.
       
    • AJ/FormS

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

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      Was it any more economical than converting the trans? Jus asking
       
    • 65 Dartman

      65 Dartman FABO Gold Member FABO Gold Member

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      IDK as another member put it up for sale at a great price and I grabbed it knowing I would need it.

      To be honest, it’s the first I’ve heard about converting the mainshaft and extension. I would guess unless one already had the parts, people are reluctant to part out a transmission and would rather sell it whole. With that conversion do you lose the rear bearing which dies make the B & T 833 a pretty stout piece.
       
    • AJ/FormS

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

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      Hyup rear bearing is gone.
      I ordered the used gearset from Passon Performance, along with one of his aluminum boxes, a re-inforced side cover, and a B/E body length mainshaft, to be used with a GVOD; which requires the long shaft. The rest of the parts I had as spares.
      The shifter had to be moved back, well, actually I always hated it being so far forward,so I moved it back cuz this was the ideal time. It is now between the buckets and I love it there.
       
    • xLURKxDOGx

      xLURKxDOGx "An angel fat, at satan's feast" FABO Gold Member

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      I’ve got a complete early 3.09 4 speed a with later 340 bell and flywheel/clutch. Pm me if interested. Not rusted garbage like similar lunatics selling things on this site.

      Jake
       
    • mopardude318

      mopardude318 Well-Known Member

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      I have a 3.09 first gear 4 speed, and I tell you what, I love that first gear 3.09. lol Excellent pull ya out of the hole gear.
       
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      • 65 Dartman

        65 Dartman FABO Gold Member FABO Gold Member

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        As long as we’re pushing transmissions I have a 65 833 as well
         
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        • xLURKxDOGx

          xLURKxDOGx "An angel fat, at satan's feast" FABO Gold Member

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          Figured I’d offer if he was interested but since your closer to him........

          Jake
           
        • AJ/FormS

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

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          Works real good with 3.55s, and not too bad with 3.23s if you got a bit of a torquey engine. But if you have an 8/1 teener with a 268* cam ;well.......... it's probably better to have an automatic and a big TC.
           
        • 65 Dartman

          65 Dartman FABO Gold Member FABO Gold Member

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          I figure with my 10.5 to 1 273/235, the 4 speed and 3.23’s in my wagon, it ought to run OK
           
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          • AJ/FormS

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

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            The only thing better than a 9.98 starter gear, is a 10.97,lol,(my combo)
             
          • 65 Dartman

            65 Dartman FABO Gold Member FABO Gold Member

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            Ummm you saying my starter gear should be 9.98 and if I went to 355’d then it would be 10.97?
             
          • AJ/FormS

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

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            Yes; that would be 10% more TM making your engine feel 10% bigger on the start line. and thru every gear. The one and only downside is that it also increases your cruise rpm by that same 10%
            My 367 is a powerhouse at low rpm. It's a dump the clutch and go deal. That's TM in action.
            With the 2.66 low and 3.23s, she was kindof a dog on the start line, with the starter gear being just 8.59. My new starter of 10.97 increases the TM by nearly 28% . That is flippin huge improvement, easily compensating for the cam-change from a 223* to a 230*.
            A 10.97 starter gear is equivalent to 10.97/2.66=4.12 with a regular 4-speed. But second is still the same 1.92. So your engine needs torque at the bottom of second gear, or else you have to carry first gear a few hundred rpm further. I like to granny-shift 1-2 at no more than 2800, cuz the pipes are singing sweetly.
            I like 3.55s because top of second is 5100 rpm at 60mph, right on,or close to the power peak, of my 223* cam, making my zero to 60 about as quick as it can be...... whereas 3.23s is 10% less or about 4600.For street performance, it's really hard to better 3.55s, with a manual trans, and a 5000 rpm power peak,which is about a 268* advertised cam.
            A 9.98 starter is still fabulous in an Early-A, cuz of the weight difference. You are easily 10% lighter than my 68 Barracuda tank. That's why I had to go with a 360; at 3650# (me in it) anything less would have been to slow-performance for me. 10 pounds per cubic inch is always a winner.
            My comment was just supposed to be funny.Sorry, that it wasn't.
             
            Last edited: Jun 24, 2018
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            • 65 Dartman

              65 Dartman FABO Gold Member FABO Gold Member

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              Thanks for the explanation - appreciate it!
               
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