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Transmission guys..help..

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Neil, Jun 29, 2001.

  1. Neil

    Neil 1/2 ton status

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    '78 K5 400sb 4x4 AT. not sure if TH350 or TH400. My parking stopper in tranny has wore out or broke or something. Is it hard to replace? Should I have to pull the tranny or replace it while on the truck? My K5 tries to roll away!
    How can I tell if TH350 or TH400 transmission? shape of pan or somethin?

    Neil H. Alabama '78 K5 400ci 4x4 AT,AC,PW Cheyenne. '74 C10 3spd/floor 250ci 4x2
     
  2. fr8train

    fr8train 1/2 ton status

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    Bring the pan to the local autozone or pep girls they have pan chart to match your tranny up.
     
  3. MudbogAD

    MudbogAD 1/2 ton status

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    th350's have a square pan with a corner cut out.
     
  4. newyorkin

    newyorkin 1 ton status

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    Hey, hope this helps.
    http://k5.8m.com What more is there to life?**
     
  5. flcpl4fn

    flcpl4fn 1/2 ton status

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  6. HarryH3

    HarryH3 1 ton status Author

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    If it's the stock trans, then it is a Turbo 350. Sounds like your parking pawl is broken. [​IMG] I'm not sure if you can replace it by just removing the pan or not.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     
  7. HarryH3

    HarryH3 1 ton status Author

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    Also check to make sure that the linkage hasn't slipped or is out of adjustment. If it's messed up the problem could be that the tranny isn't quite going all the way into park, even though the lever says it is.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://www.angelfire.com/super/ThunderTruck>http://www.angelfire.com/super/ThunderTruck</A>
    It's a great day to be alive...
     
  8. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    Im not super familiar with GM trannys but I do know that on Fords you dont have to r&r the trans to replace the park pawl but you must pull the t case and extention housing to remove the pivot pin that goes through it.There also may be spring that holds the park pawl away from the park gear that that pin also goes through.Its been a few years since Ive had a GM tranny torn down but I dont think you have to pull the whole thing.

    <A target="_blank" HREF=http://community.webshots.com/user/beaterwhang>http://community.webshots.com/user/beaterwhang</A>
     
  9. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    ........but before you tare anything apart make sure you have propper shifter opperation outside the trans and if you dont find anything outside ,pull the pan and see what you can see in there.Good luck.

    <A target="_blank" HREF=http://community.webshots.com/user/beaterwhang>http://community.webshots.com/user/beaterwhang</A>
     

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