c4 woes

Discussion in '1974 - 1978 Mustang II Talk & Tech' started by DangerousII, Sep 20, 2011.


  1. DangerousII

    DangerousII New Member

    Joined:
    May 17, 2011
    Messages:
    21
    Likes Received:
    1
    Trophy Points:
    0
    Alrighty, So I think my tranny is on its last leg...

    here are my symptoms,

    When car is cold, hasnt been driven for atleast 4 hours, when put into drive, if i hit a bump, or step on the brakes, the transmssion looses line pressure and comes out of gear.. (transmission is full of fluid)

    When sitting at a stop light in drive, or 1'st i have to put excessive pressure on the pedal to hold the car stopped, normal pressure can be applied if i have the car stopped in 2nd gear (idle is set to 850 in park)

    When shifting from 2nd - third it will give me a big slip..

    I know the slipping third gear shift is a typical c4 issue, what about the other 2?

    i have a fully built reverse manual valvebody C4 mated to my other high horsepower motor but it has a 3500 stall, so i am reluctant to swap those two trannys untill i can afford another converter..

    Is there anyhting i can do to prolong the life of this tranny, or deal with mainly the loosing line pressure when cold issue?
    I just want to limp it into winter...
     
    #1
  2. James75

    James75 Member

    Joined:
    Jan 14, 2008
    Messages:
    60
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    SD
    Hey DangerousII, do the symptoms go away after it's warmed up? If so I suspect the clutches are worn out. How does the fluid look, normal pinkish/red or tan/brownish? Is the pan bent upwards into the pickup? Is the screen clogged? I've burnt up many c4's and they slip like hell cold, but never had a problem holding it stopped in 1st or drive, that ones a mystery to me too.
     
    #2
  3. DangerousII

    DangerousII New Member

    Joined:
    May 17, 2011
    Messages:
    21
    Likes Received:
    1
    Trophy Points:
    0
    fluid is a red, no smell of burnt, it dosent slip out of gear, it looses line pressure and dis'engages out of drive/2nd/1st, you bring the rmp up a couple times and clunk back into gear.. engine/tranny are on solid mounts..

    it slips into third almost all the time, sometimes it will have a good day and shift hard for a bit..
     
    #3
  4. COBRA 7

    Founding Member

    Joined:
    May 19, 2000
    Messages:
    454
    Likes Received:
    3
    Trophy Points:
    19
    Location:
    Bangor, Maine
    In cold weather, My c-4 likes to be a little over full on the dipstick.

    Add 1/2 a quart and see if it helps.

    Maybe dipstick not real accurate.
     
    #4
  5. DangerousII

    DangerousII New Member

    Joined:
    May 17, 2011
    Messages:
    21
    Likes Received:
    1
    Trophy Points:
    0
    sorry guys, added a buncha lucas tranny fix type **** and it stopped loosing pressure cold, but it still slips going into 3rd horribly, and feels like seccond dosent quite have the grab anymore.. its on its way out..

    So, I want to build a c4 That rattles my teeth, breaks my back, and and knocks my head off the roll bar when it hits seccond and third gear.. what do you guys reccomend internals wise?
     
    #5
  6. MUSTANG J

    MUSTANG J Member

    Joined:
    Dec 29, 2006
    Messages:
    357
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Guelph Ontario Canada
    The B&M "Transkit" works good. I managed to rebuild it myself with the great instructions in the kit. The C4 is easier then most Automatics to rebuild. No special tools required. A C-clip removal tool is the only "special" tool required. Make sure you get the proper filter, last time I got lazy, had a shop rebuild it and they used a generic C4 filter. The fluid pick-up was pressed up against the pan, how it got any fluid I will never know. Note: getting someone to rebuild your automatic transmission cost a lot of money for a reason, it is a BIG time consuming job. Took me a couple of days just to clean all the burnt clutch off of everything, I have more time then money though LOL.

    B&M 50231 - B&M Transkits - Overview - SummitRacing.com
     
    #6
  7. cobraii351

    Founding Member

    Joined:
    Jan 10, 2000
    Messages:
    1,102
    Likes Received:
    0
    Trophy Points:
    37
    Location:
    Altoona, PA
    Yeah the c4 is a simple trans to do. And fairly easy to make hold more power. Extra clutches and a good servo a C4 will live a happy life behind a stout small block. Good job on the rebuild.

    Tim
     
    #7
  8. MUSTANG J

    MUSTANG J Member

    Joined:
    Dec 29, 2006
    Messages:
    357
    Likes Received:
    0
    Trophy Points:
    16
    Location:
    Guelph Ontario Canada
    Opps I forgot that part. If it is an actual Mustang II trans, make sure you get a forward clutch drum that holds more frictions. With 139HP on tap Ford got stingy with the poor Mustang II C4. I bought the drum for peanuts @ a local transmission repair shop.
     
    #8

Share This Page