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Somebody with a TH400 diagnostic chart- Can you look something up?

Discussion in 'The Garage' started by FWP, Jul 26, 2005.

  1. FWP

    FWP CRS

    Joined:
    Oct 11, 2000
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    Location:
    Prescott Valley, AZ
    1-2 late, harsh shift. Can you list the possible causes for me please? Everything else is normal on this tranny, except the 1-2. TIA!
     
  2. tomseviltwin

    tomseviltwin 1/2 ton status

    Joined:
    Dec 23, 2001
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    Location:
    Utah
    vacume modualtor
     
  3. dave_90_blazer

    dave_90_blazer 1/2 ton status

    Joined:
    Jan 1, 2004
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    Location:
    Melvindale, Michigan
    first thing to check, pull the hose and look for fluid
     
  4. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

    Joined:
    Jul 18, 2001
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    5,693
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    Location:
    CA
    Possible causes:

    Fluid level
    Vacuum modulator
    Missing check balls (not possible if it worked normal and just started acting up)
    1-2 (rear) accumulator
    burned intermediate clutches
     

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