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TH-350 troubleshooting help

Discussion in 'The Hokey Ass Message Board' started by Roothawg, Feb 6, 2007.

  1. Roothawg
    Joined: Mar 14, 2001
    Posts: 25,984

    Roothawg
    Member

    A buddy of mine just called and I am trying to diagnose a problem via telephone.

    Scenario:
    1967 Camaro with a TH-350
    Was driving fine no symptoms, then last time started it felt like it was going in and out of gear.
    Fluid levels good, not burnt.
    He only drove it a mile or so to get it home. By the time he made it back to his driveway he had to rev it pretty high to get it to move.

    So what are your thoughts?
    Pump let go? Converter gone south?
     
  2. I'm not sure if it's this simple, but mine did that when I lost one of my vacuum caps off the modulator.

    Bryan
     
  3. Roothawg
    Joined: Mar 14, 2001
    Posts: 25,984

    Roothawg
    Member

    It won't engage reverse now, so I wouldn't think the modulator would be suspect.
     
  4. That's how they act if they lose a lot of fluid. Are you sure it's not really low on fluid and the fluid is foamed up and splashing around giving you a false reading on the dipstick? Check the transmission cooling lines for a major leak, like if a hose clamp was loose.
     
  5. CSU55Chevy
    Joined: Oct 10, 2006
    Posts: 78

    CSU55Chevy
    Member
    from Olathe, CO

    Humm, my th-350 acted just like that before I discovered it was spilt in half....yes, IN HALF! The motor and trans mounts keep the pump somewhat engauged but things just dont work. Hope thats not the issue though...
     

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  6. Roothawg
    Joined: Mar 14, 2001
    Posts: 25,984

    Roothawg
    Member

    Hmmmm..................split in half huh? I Hope that's not it.
     
  7. stewedscrewdtattood
    Joined: Oct 20, 2006
    Posts: 408

    stewedscrewdtattood
    Member

    i just went to a shop to pick my th350 and he has stacks of these damn things all of them cracked in half but they all cam from dragsters
     
  8. drop the pan , install a new filter,it's worth a try
     
  9. Leaky Pipes
    Joined: Jan 11, 2005
    Posts: 596

    Leaky Pipes
    Member

    try installing an adjustable vacuum modulator. maybe the kickdown is stuck?
     
  10. blue57ford
    Joined: Jul 24, 2005
    Posts: 491

    blue57ford
    Member

    What gear would go in and out? If it were third, that could explain why there is no reverse because the high and reverse clutches could have gone out or you there is wear on either the drum or pump stator areas. More than likely its time for a rebuild.
     
  11. 53Heavy
    Joined: Jun 19, 2006
    Posts: 308

    53Heavy
    Member

    Hey Roothawg,
    What happened on this? This happened to me this weekend pulling into the Roundup and had to haul it back to Dallas on a trailer.
     
  12. Roothawg
    Joined: Mar 14, 2001
    Posts: 25,984

    Roothawg
    Member

    Dunno the final outcome. I will call him and find out.
     

  13. I was going to suggest the same thing. No reverse cold ****** usually means clogged filter. But that usually means you will need to pack it anyway.

    On the otherhand.

    The Turbo350 that was behind the mill in the Pusher acted a little like than it only had second and second was iffy. The insides were a mess TCI kevlar band was so frayed you could pinstripe with it. On close inspection the hawgs head was spiderwebbed. Turnes out the 11" converter coughed some of its guts up when it turned loose and they went through the ******. Contrary to popular they just aren't a good dragrace ******.
     
  14. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,277

    SinisterCustom
    Member

    TCI = garbage.........
     
  15. UH Huh The 400 is all B&M pieces it shouldn't come apart.

    Funny thing about it is I got it out of a Stude g***er guess where its headed.:D
     
  16. Duration
    Joined: Oct 2, 2006
    Posts: 543

    Duration
    Member
    from Wayne, MI

    how do you figure that? i use there converters and trans parts exclusively.

    the problem described in this post sounds like:

    trans low on fluid
    obstruction in the valve body
    clutches wasted
    pump gone bad
    torque converter bad
     
  17. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,277

    SinisterCustom
    Member

    I rebuilt a 727 years ago using a TCI kit.....cheap parts and never shifted right....I gutted the trans and got a kit from NAPA instead. And I've done a few trans since with NAPA kits with excellent results. I like Turbo Action and a few others for race apps.......

    If I buy a part or get service from a company and I'm not happy with the part or they don't treat me right, I NEVER deal with that company... EVER...they have lost MY business....TCI, MSD, and a few others...just the way I am......
     
  18. 55 dude
    Joined: Jun 19, 2006
    Posts: 9,357

    55 dude
    Member

    change the filter and make sure the govener is not stuck. good luck
     
  19. vette man
    Joined: Aug 30, 2006
    Posts: 83

    vette man
    Member

    I have rebuilt a few th 350"s all with NAPA kit also had great results never a problem added a B&M shift kit from them also work great ! one sitting in my model A frame now . Cant wait to finish the body and here second gear snap loose!
     
  20. dragrcr50
    Joined: Jul 25, 2005
    Posts: 3,865

    dragrcr50
    Member

    prolly bad but, over fill it with a couple of quarts and see if it moves if so, the filter has dropped into the pan and not picking up fluid.........
     
  21. txrocker13
    Joined: Jun 20, 2006
    Posts: 56

    txrocker13
    Member

    Damn dude that ****s! Give me a call if you need help with anything. :(
     
  22. 53Heavy
    Joined: Jun 19, 2006
    Posts: 308

    53Heavy
    Member

    The truck got up to about 230 waiting in line to enter the Roundup and then this problem kicked in. She usually runs at about 180 and about 210 in traffic.
     

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