235 70 15 rear early abody

Early A-Body Discussions

  1. Johnny Dart

    Johnny Dart Well-Known Member

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    No problem....Make sure you have your 235/70-15s on. :)
     
  2. Slantsix64

    Slantsix64 Well-Known Member

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    lol nope i have 215 70 14 on it still.:rofl:
     
  3. Mouse action

    Mouse action Well-Known Member

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    I use to have a 70 duster with a 225 /6 with dragrite 60s x15” and that little coffee can car would blaze the rear tires,,,,so I believe in the FIRECRACKER theory.
     
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    • dogbreath

      dogbreath Well-Known Member

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      255/60-15 under my 66 valiant , stock location , ss springs
       
    • Dave_J

      Dave_J Active Member

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      I guess the question should be:
      1. "Will 235/70 15's fit in my early A body"

      OR

      2. "Should I try 235/70 15's on my early A body?"

      The answer to #1 is in most A bodys yes it should fit. But the answer to #2 is depends on a few factors.
      What is the implied use going to be? 100% freeway or 100% drags or a mix.
      What is the rear end gear ratio? 2.45:1 then NO it will be a dog off line. But 4.56:1 then yes.
      A quick check. Say a 65 Dart came with A-78 13's (155/78 13) and you want to go to 235/70 15. At 65 MPH your RPM's in the following gears:
      2.76:1 = 2640 vs 2130
      2.94:1 = 2851 vs 2297
      3.23:1 = 3110 vs 2500
      3.55:1 = 3440 vs 2774
      4.56:1 = 4422 vs 3563

      So say you have 3.55:1 gears and you take your A-78 13 off and put this 235/70 15 on it would be ALMOST like replacing your rear gears to 2.94:1 with the A-78 13's.... Good for commuting, not good for drags or Stop-Light to Stop-Light....
      But if it were me, I have an extra set of wheels mounted with some 275/50 15 Hoosier R7 drag radials for my track only days.... I have these for my LRT on extra LRT 8 inch rims.

      YMMV ;)
       
      Last edited: Dec 5, 2019
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      • V8-valiant

        V8-valiant Well-Known Member

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        I ran 235-60-15’s with a 7” wheel before I went to a mini tub. With people in the back it would rub occasionally.

        BBFA377C-DC4C-4FA9-975C-10D5732462D7.jpeg

        F19E6629-30C5-476A-A20E-0CBAE3D8227D.jpeg
         
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        • JDMopar

          JDMopar Well-Known Member

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          What rear end were you running in the car when those pics were taken? I love the way it sits! Do you know what the back spacing on the wheels is? I have a 65 Barracuda I'm fixing up, and going to big bolt pattern all around. I have my choice of using and A body 8 1/4, or an A body 8 3/4 with Dr. Diff axles and drum brakes that fit the axles. I have some 15 x 7 aluminum mags, and I'd love to put 235-60/15's on the back if possible.
           
        • Dave_J

          Dave_J Active Member

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          On post #18 I posted a picture of my 1965 Barracuda with a Dodge Aspin 8 1/4 and 275/60 15's on 7 inch Dodge Cop Car wheels.
          They do rub the springs when I corner a bit too fast and on the outer fender only when I have two people in the back seat. But for years I ran 245/60 15's on that same rim.
           
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          • JDMopar

            JDMopar Well-Known Member

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            Thanks! Odd thing is, my Barracuda has an FMJ 8 1/4 in it right now...lol. It looks 47 miles wide, and has crappy old tires on it. It’s cobbled to hell and back by whoever put it in, so I will have to fix all that if I were to keep it in there. I’m thinking I may use a stock width A body 8 3/4, and use Dr Diff’s half inch narrower spring perch kit to gain a tiny bit of room. If this thing ever has enough power to need 275’s, I’ll mini tub it and move the springs to the frame rails.
             
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            • Slantsix64

              Slantsix64 Well-Known Member

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              So i ended up picking a rim and tire set up for my 64 going with 14x7 225 70 14 in the rear i like the way Mikes 66 Looks only thing is i will use 14inch rim than a 15inch. and i will reuse my front tires 215 70 14 just put them on a 6 inch rim instead o the stock 4inch or whatever size it is. Thanks everybody
               
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              • pishta

                pishta I know I'm right....

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                Someone tell me what max tire is in a 65 Barracuda with a stock A 8 3/4 rear. 205/70R14's currently on rallies. Want to go 15's as i have 15x7 SBP reverse Centerlines from a Chevy 2 so they are more back spaces than front. Maybe 5 back and 3 front. Redrilled.
                 
              • Slantsix64

                Slantsix64 Well-Known Member

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                i seen 255 60 15 on the rear of an early abody back spacing 4.5 i think he said
                 
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                • 66fyssh

                  66fyssh Don't Stop Believin' FABO Gold Member

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                  :popcorn:
                   
                • Dave_J

                  Dave_J Active Member

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                  OK, STOCK 7 1/4 was a A78 13 that is close to a 155/78 13.

                  The upgrade was D70 14 and that was about a 165/70 14. So that should have been used for any 65 Formula S. But the 1964-1966 Barracuda's got a bigger rear wheelwell than most of the other A bodys so you can fit a bigger tire under one than a Dart/Valiant.

                  Using a 1974 Dart Swinger 7 1/4 LBP axle and SS springs, I had 245/60 15's under my 1965 Formula S Barracuda on 5.5 inch Mopar rallys for a few years and NEVER rubbed.

                  Currently have 275/60 15's on Cop Car ralleys under it but they do rub.
                   
                  Last edited: Jan 9, 2020
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