1. joes68340s

    joes68340s Well-Known Member

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    Been looking for 904 cores for a small block drag car. Cant find any locally most people dont want to ship. My question is are the late 60s trans good, what upgrades do they need. I see mostly 1968 to early 70s if i find them. I have lots of 727s but having a hard time finding 904s.
     
  2. VanceC

    VanceC Well-Known Member

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    The guy I'm buying my 318 from is going to be selling his 904. He's in norcal too. I'll tell him.
     
  3. shittyslant6

    shittyslant6 Well-Known Member

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    I think I have a 904 I got for free when i bought my car, let me see. not sure if it is for a small block though.
     
  4. csx711

    csx711 GT Twist

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    • csx711

      csx711 GT Twist

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      I have a very good 904 I an in bayarea California. Has been gone through. But I am going install BB and 727. No need for 904
       
    • CudaFactHackJob

      CudaFactHackJob Well-Known Member

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      You need one that came with the part throttle kickdown that extends past the rear servo fluid hole. There are two different cases in the mid/early seventies. I get them in all the time that the vb came from a diff trans. Sometimes the parts can't be made to be compatible.
       
    • joes68340s

      joes68340s Well-Known Member

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      I thought part throttle kickdown was an extra valve on the valve body. I just installed one on my 727. This is to be a Drag only trans and running a manual valve body.
       
    • rigger3006

      rigger3006 Well-Known Member

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      if you know anyone travelling thru northern bc i have one from a 71 challenger. a long shot i know

      .
       
    • csx711

      csx711 GT Twist

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      My transmission is complete. Just pulled out my running car. PM if you want it.
       
    • CudaFactHackJob

      CudaFactHackJob Well-Known Member

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      It is an added valve, but they usually also changed the vb casting where it bolts to the case and also the case in that same area. Mix them up and the trans will still "work".
       
    • Locomotion

      Locomotion Well-Known Member

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      I've run 904s since 1999. JW Transmissions always built them. Don't know of any little "tricks" or other detail, but some parts used included the typical reverse manual valve body, 4.2 lever, 2.74 low gear, "red" clutches and deep pan & p/u w/magnets.

      A knowledgeable Torqueflight mechanic should know how to swap the low gear set from a later 904, which is often a lock-up trans, to a regular older 904. Level of benefit of a low gear set depends on the car weight and engine combo.
       
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