1. F21

    F21 Well-Known Member

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    Not sure if I should have posted this in the Trans section but finally got the car on the road
    Trans overheated in 2 miles 240°
    It is 727 and has a PTC 4500 stall all the other parts are from CRT reverse manual valve body external Trans cooler i’ll let it cool down and then drove it back home seemed like it was not shifting all three gears thoughts
     
  2. 448Scamp

    448Scamp Running Free

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    What cooler do you have? They’re not all the same.
     
  3. F21

    F21 Well-Known Member

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    It is just a L cheapo but are used to run it in the same location with my old set up and never had an issue

    33D95B74-5DDD-4909-AB7B-4A9F35471537.jpeg

    5DE1BFF8-66C9-4B82-A007-4330983D4DAA.jpeg
     
  4. 448Scamp

    448Scamp Running Free

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    Does it run through the radiator first? If so, eliminate that.
     
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    • Lefty71

      Lefty71 Well-Known Member

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      Double check the bands.... look for fried or aerated fluid, and for sure reposition that cooler so it actually gets air flow!!

      I'd pull the hoses at the trans end and make sure that cooler and lines setup arent pinched or damaged internally somehow. I have seen hoses delaminate internally without leaking externally.
       
    • 413

      413 Well-Known Member

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      Overheated in 2 miles? What were you doing? How many RPM. Newer converters are pretty specific for application?

      Were you driving up hill at 2500 rpm in third gear? Then I can understand it getting hot.

      a friend spent 4K for a CRT 904 for, racket racing. The trans smoked hinges in 12 runs. Cope said, “I thought I fixed my valve body problems!” Problem was that CRT didn’t fix it. So he had to get a new valve body and rebuild the trans.

      CRT didn’t do squat to help him after spending 4K
       
    • F21

      F21 Well-Known Member

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      The cooler lines do not go through the radiator just threw the cooler I did think about dropping the pan tomorrow and double checking the bands I do agree I should probably move the trans cooler however it was there with my last set up at never had an issue fluid looks good smells good I was driving on a flat Road maybe I 3000
      RPMs I hope it’s not a problem with the valve body that sucks that he did not take care of your Buddy
       
    • Dana67Dart

      Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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      have you run 4500 converter before?
       
    • mopowers

      mopowers Well-Known Member

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      If that's true, that's really shitty.
       
    • F21

      F21 Well-Known Member

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      No first time with the 4500 stall i used to run a TCI 3500
       
    • Dana67Dart

      Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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      Reason I ask is that's a lot of converter slippage at low speeds, slippage = heat in my book
       
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      • Dana67Dart

        Dana67Dart The parts you don't add don't cause you no trouble FABO Gold Member

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      • Bobzilla

        Bobzilla Well-Known Member

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        Are you saying that after getting it hot it’s not shifting into third, or was it not shifting correctly right from the start?
         
      • F21

        F21 Well-Known Member

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        Took it 2 miles to miles to a buddies house shifted fine did not overheat was hanging for about an hour then to father-in-law‘s 2 more miles and got hot 240 than let it cool for an hour and drove home shortcut 1 mile that’s when it was not shifting correctly
         
      • MOPAROFFICIAL

        MOPAROFFICIAL FABO Gold Member FABO Gold Member

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        Half of the cooler is in front on the radiator bracket , not flowing air through that.
        Also check out the Derale pan with the flow through cooling tubes.
         
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        • RustyRatRod

          RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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          Cheap shit way small cooler that's half blocked. I don't know what else to say, really.
           
        • 413

          413 Well-Known Member

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          Does continued driving at 3000 rpm with a 4500 converter sound like it will work out very long? Don’t they just build heat like crazy if driving below the stall speed? I think it needs to be above the stall speed to not make so much heat.
           
          • Agree Agree x 1
          • F21

            F21 Well-Known Member

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            Took it for a drive this morning
            It’s not shifting out of first if you let off the throttle and wait a minute it will shift sometimes also noticed when I got back I put the car in neutral and I can barely roll it until it cooled down then I could roll it but was still hard
             
          • Bewy

            Bewy Well-Known Member

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            I don't think the problem is cooler related. Overheating in 2 miles sounds like slippage...clutch or band slippage. Cannot think of anything else that can generate that much heat that quickly.
             
          • Jadaharabi

            Jadaharabi FABO Gold Member FABO Gold Member

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            Are your brakes hanging up and causing the converter to slip?
             
          • justinp61

            justinp61 Well-Known Member

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            How is it not shifting correctly? What exactly is it doing?

            I've driven several loose converters on the street and never had any issues. My current converter flashes 5600 and works fine on the street.
             
          • famous bob

            famous bob mopar misfit

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            I have run that type cooler on 4 diff. hot rods , never had a problem with them.
            And I do have this one ran thru the rad. first , then to the top of the cooler ,and out the bottom, back to the trans. .
            if the engine is running at the proper temp. , then the trans should run a bit cooler this way .---working for me .
            I f his cooler is`nt flowing poorly, I`d blame it on the wrong convertor for a street car !!
            Is the convertor the only thing he changed ?
            Also prefer the cooler be mounted side ways , instead of up-down-----
             
            Last edited by a moderator: Aug 16, 2021
          • j par

            j par Well-hung Member

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            Almost sounds as if the brakes are dragging...
             
          • F21

            F21 Well-Known Member

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            Hey thanks for all the replies
            So I pulled the valve body out last night found out bands are super loose and worn down also noticed I must have forgot to put the accumulator rod in because that piston was sitting all the way up pulled it out and it was dry and like no fluid has been passing through I wonder if this is the cause for overheating and then slippage causing the bands to wear down going to pull the trans out tonight and tear down
            Thoughts
            Also this was a complete build I did not just torque converter
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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            Did you ever check line psi before this?
            Kick down eliminated , right?
            Glad you're able to track it down
             
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