904 Linkage seems off?

Transmission and Drivetrain Tech

  1. briwill70

    briwill70 Well-Known Member

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    Rebuilt my 904 and added a shift kit. The new valve body plunger came with instructions on how to align with the shift mechanism. Everything is back together and the car goes down the road and shifts nicely but a couple of issues. The kickdown linkage is connected but does not downshift when I put the pedal down. If I manually put it in second it downshifts but when I put it back in drive it stays in second. The other day it stalled coming off a light so I put in neutral and restarted and the car lurched backwards like reverse was engaging. Is the valve body plunger the issue?
     
  2. oldkimmer

    oldkimmer FABO Gold Member FABO Gold Member

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    It’s a definite possibility. Is the linkage engaging each gear detent properly? Check the linkage with a helper. Kim
     
    Last edited: May 10, 2020
  3. briwill70

    briwill70 Well-Known Member

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    Not sure how I would check that. It's a cable shift system and not really visible from outside the trans.
     
  4. oldkimmer

    oldkimmer FABO Gold Member FABO Gold Member

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    If ur underneath with ur hand on the lever u can feel it click into each position. Kim.
     
  5. briwill70

    briwill70 Well-Known Member

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    Unfortunately there is no lever. It's a 65 cable shift. Cable goes directly into trans housing. No way to see what's happening in there.
     
  6. oldkimmer

    oldkimmer FABO Gold Member FABO Gold Member

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    Then u will have to take the pan off to check it. U want it to be right so u don’t end up destroying the tranny. Kim
     
  7. Slantsix64

    Slantsix64 Well-Known Member

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    Yup, the gear selector cable has a bolt you loosen it and spin the gear adjusting the cable, pan must be off and have some one change the gears while you under seeing it actually en gauge in all gears PRND21 your probably adjusted off so your not getting D when selecting it on the gear selector no biggie you got this!
     
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    • briwill70

      briwill70 Well-Known Member

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      I pulled the pan and appears the problem is in the column shift mechanism. Shifting from P-R-N-D-2-1 everything lines up but going in the other direction there is a lot of slop. From 1-2there is no movement and from D-N it does not shift out of D and does not go into R until almost in P. I pealed back the boot around the shift mechanism in the column but impossible to see what's going on in there.

      Also found another issue that may or may not be related. When I pulled the pan there is a dark film on the bottom of the pan that looks a lot like burnt clutch material and I've only driven about 40 miles : (
       
    • briwill70

      briwill70 Well-Known Member

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      Anyone have experience with this kinda slack in the column shift mechanism?
       
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