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Technical Help identifying nailhead trans

Discussion in 'The Hokey Ass Message Board' started by Fordguy91, Oct 23, 2015.

  1. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    Im going to purchase a transmission for my 401 nailhead and have found what I think is a st400. Can anyone confirm or deny please.
     

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  2. porknbeaner
    Joined: Sep 12, 2003
    Posts: 41,007

    porknbeaner
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    Need to see more of it then that.
     
  3. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
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    from Fl

    That's all the pictures he has of it and can't take any more otherwise I would've posted them...
     
  4. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,694

    56sedandelivery
    ALLIANCE MEMBER

    Judging by the side supports, that are used in the machining process, it's a TH400. Whether or not it's a switch-pitch will depend on the wiring to the trans. Better/more pics will give a better answer. I am Butch/56sedandelivery.
     
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  5. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
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    it has the visual clues to make me think it's a ST400 for a Buick. The bellhousing was used thru 66, and they were all switch pitch in Buicks in that era, right?

    I wouldn't hand over any cash until getting a better look at it..
     
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  6. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    Ok I'm going to pick it up this weekend if possible. He is asking $100 which i think is fair. Its a 2 hour drive from me so I will likely take it home regardless. The transmission pan should be the big giveaway correct? Same as a TH400 if memory serves me.
     
  7. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
    Member

    yeah. Look at the input shafts....the outer one (the stator support) has a short spline, and a wide journal on a super turbine. Also make sure the bellhousing bolt pattern looks right, not a Jeep or Cadillac or Rolls Royce or Jaguar. Also the tag on the side should have a two letter code starting with Buick and the date 64, 65, or 66

    [​IMG]
     
  8. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    Ok next question is the torque converter is gone. How hard is it to find a converter assuming its a switch pitch and if its not how hard is it to convert to non switch?
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
    Member

    You would have to change the pump assembly and input shaft (which generally includes the forward clutch drum) to make it "normal". SP converters are getting harder to find...ask a transmission shop if they can get them still? The old Dacco number for the 400 switch pitch converter is B2, the number for the smaller diameter 300 switch pitch converter is B1 (not B1A).

    I just googled, there's a B2 on amazon for a couple bills....

    http://www.amazon.com/DACCO-Torque-Converter-Remanufactured-Transmission/dp/B00ETHEDLC

    :)
     
  10. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    Cool deal thank you very much. I will know more tomorrow when I grab the trans. Good find on Amazon I've heard of a company called tri shield performance I believe that builds custom SP converters but have no info on their website.
     
  11. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,694

    56sedandelivery
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    Does't Kenne Bell still offer the switch pitch kits and converters? I am Butch/56sedandelivery.
     
  12. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
    Member

    KB got out of the business years ago. I just got a converter from Jim at Tri Shield, put it in my Chevy II, it's working pretty well. Then on Drag Week I ran into a couple guys who know him pretty well, they said he doesn't build them himself, he has another place do it. I wonder where that place is.

    btw mine cost four bills, stall speed is around 3000 rpm now, supposed to have brazed fins, etc. It survived a 4100 mile trip including half a dozen drag strip runs and didn't put any metal flakes in the pan, so it must be OK.
     
  13. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
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    from Fl

    Where does she stall in low pitch?
     
  14. speedcity
    Joined: Jul 9, 2007
    Posts: 30

    speedcity
    Member

    You need a Dynaflow if your 401 is 63 or earlier. The crank is different on the later engines and will accept the ST400 without mods. There is an adapter or bushing that is available to convert earlier engines. I can't tell what trans you are showing, but it does not appear to be a Dynaflow.
     
  15. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    It's a 64-66 block casting number.
     
  16. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
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    like a normal stock converter, around 1500 or so
     
  17. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
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    from Fl

    Awesome squirrel that sounds killer.
     
  18. Lobucrod
    Joined: Mar 22, 2006
    Posts: 4,076

    Lobucrod
    Alliance Vendor

    DACCO's part number for the switch pitch torque converter is B2. Should still be available, I got a new one about a year ago for the Chevy TH400 behind the 409 in my 39 chevy coupe that I converted to switch pitch with some Buick parts from a spare nailhead trans. Works great with about 2800 stall in the high stall mode. No problem to change to non switch pitch. Just need the front pump from a non switch pitch trans.
     
  19. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
    Member

    best I ever got out of stock rebuilt converters was about 2000 on a B2, and 2500 on a B1. Mostly the B1s are good for about 2200. this is behind mild big blocks.
     
  20. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    Well I picked up the trans yesterday and it's 400 switch pitch! The only problem now is the missing converter which is no big deal and the bell housing is cracked so it's getting tore down and off to the welders.
     
  21. Phil1934
    Joined: Jun 24, 2001
    Posts: 2,608

    Phil1934
    Member

    PAE Enterprises out of El Paso has a variety of stalls for a switch pitch. When I ordered a trans a decade ago from Poston it came on a PAE pallet
     
  22. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
    Member

    are they still around?
     
  23. Phil1934
    Joined: Jun 24, 2001
    Posts: 2,608

    Phil1934
    Member

    Just did a white page search and looks like out of business
     
  24. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
    Member

    that's what I thought
     
  25. Phil1934
    Joined: Jun 24, 2001
    Posts: 2,608

    Phil1934
    Member

    Is anything more than a SP300 converter and flex plate required to put a 12" converter in instead of the 13"?
     
  26. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    Wondering the same
     
  27. squirrel
    Joined: Sep 23, 2004
    Posts: 43,241

    squirrel
    Member

    the converters interchange. Most flexplates have both bolt patterns.
     
  28. Fordguy91
    Joined: Apr 14, 2013
    Posts: 49

    Fordguy91
    Member
    from Fl

    Yea it turns out a flexplate is harder to find than a converter!
     

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