Friction disks to thick?

Transmission and Drivetrain Tech

  1. Cope

    Cope Fusing with fire

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    I just rebuilt my 904 and with the four new disks and steels the 1/4 inch steel that the big snap ring goes on top of won't fit. The new stack is to tall. I can get the snap ring in if I use a new thin steel in place of the thick one or if I take one friction ring and steel pack out.
    What's the lesser of the two evils here?

    One less pack or the thin ring?

    This is in the rear most drum. The front drum is fine for some reason.
     
  2. Biff

    Biff Well-Known Member

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    You should be able to get thinner steels , a good transmission shop should be able help you , they should have some kicking around.keep all the frictions .
     
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    • Cope

      Cope Fusing with fire

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      Tomorrow ill look at the old steels and see if the old ones are thinner, if they are I'll use old ones that are still good.
      Funny thing is that entire rear clutch pack didn't really even need replacing. It all looked fine.
      Now the front clutch pack was completely smoked. Zero friction material and the steels are all blue and dam near welded to the friction disks.
       
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      • MoparMike1974

        MoparMike1974 Well-Known Member

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        I always save all my old clutch steels if they are in good shape. Sometimes you need a thicker or thinner one to get your clearance correct. There used to be "selective" snap rings of various thickness to set clearance. Not sure if they are still available anymore. Last I bought them was 15 years ago straight from mopar.
         
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        • Biff

          Biff Well-Known Member

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          Try tci transmission shop. The had 904 stuff in store had it overnight,although I’m in Canada ?might have better luck down south with your guys .
           
        • Biff

          Biff Well-Known Member

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          I delt with Marci she is the leader of the west coast door slammers out of mission race way ,she’s kinda grumpy but super helpfull
           
        • mullinax95

          mullinax95 Well-Known Member

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          Talk to @fishy68 .... he builds transmission for a living.
           
        • j par

          j par Well-hung Member

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          Also TrailBeast was instrumental in helping me rebuild my 904. A great friendly resource. Also I can't remember so I made a point about a thinner retaining ring? I believe as remember some of the videos that this was more the answer then thinner disk? Also I hear them Machining out the bottom of those so they can receive an extra disc also? Food for thought LOL or just something to make you more confused...
           
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          • MoparMike1974

            MoparMike1974 Well-Known Member

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            You actually machine the pressure plate to accept an extra disc. If you have access to a lathe its really easy to do.
             
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            • Max1196

              Max1196 Well-Known Member

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              Set the first steel in place on the piston and check the engagement height, is there room to shorten the aluminum piston and still have that first plate able to spline correctly on the hub?
               
            • transman

              transman Well-Known Member

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              I can't help you with the thickness of the friction discs, but the steel plate thickness is normally .068" and if you're in need of oversize steels, they are .088 thick. The rear clutch (forward clutch) snap ring is .060 thick.
              Hope this helps.
               
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              • Bakerlite

                Bakerlite Well-Known Member

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                Hey Bud, you got the right frictions in the right drums?
                 
              • toolmanmike

                toolmanmike FABO Staff Staff Member FABO Gold Member

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              • KickDown

                KickDown Just a Brit in Germany

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                For the rear (forward) clutch you can pick up thin frictions (0.061") from A&A. They also have selective clutch drum snap rings.
                 
              • Bakerlite

                Bakerlite Well-Known Member

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                So you took out 4 old frictions and 4 old steels and now you can't put in the same amount of new frictions and steels?? If that's the case then I think I've narrowed down your problem. Just for your info, the rear drum should contain smooth thin frictions and the front drum should contain thicker "waffle" type frictions.
                 
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                • Cope

                  Cope Fusing with fire

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                  The disks from TCI are all the same.
                   
                • Bakerlite

                  Bakerlite Well-Known Member

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                  And they are????? All thick with grooves in them?
                   
                • Cope

                  Cope Fusing with fire

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                  Yup.
                   
                • Bakerlite

                  Bakerlite Well-Known Member

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                  Well then TCI gave you the wrong frictions for your rear clutch. You need the thin smooth ones. You also need to pay more attention to what you are doing and the parts that are coming out of the box. I do this for a living and if you were my apprentice I'd be saying this to you, so don't take my harsh comment the wrong way.
                  Also all these posts and no one picked up on the most obvious problem. Welcome to asking questions on the internet.
                   
                • Cope

                  Cope Fusing with fire

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                  The ones that came out were just metal, they had dam near welded them self to the steels. There was no friction material left.

                  So no comparing them to the orignal...
                   
                • Bakerlite

                  Bakerlite Well-Known Member

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                  It was the front drum that was smoked you said.
                  I am talking about the rear drum, the one you are having the problem with. You said the frictions in the rear were OK, so those are the ones you would be comparing with. If you were having issues with the front drum then we would have been having a different conversation.
                   
                • Cope

                  Cope Fusing with fire

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                  From the pump it is the rear most stack, near the tail shaft. That I had issues with.


                  I see what your saying, and yes. The new ones did not look like the old ones.
                   
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