Transmission help

Discussion in ''Da Nailhead' started by 50nailbox, Dec 11, 2018.

  1. 50nailbox

    50nailbox Member

    Hey guys, I have a lead on a transmission that came off a 401

    Story is. I made a post on FB looking for a st400
    This dude claimed its a t400 off a nailhead and std
    I know nothing of these transmission
    So I'm including pics to see if any of you gents can help me.
    Firstt pic in the trans
    2nd is the trans bolted to the engine


    Please tell me. It's not a dynaflow
     

    Attached Files:

  2. TrunkMonkey

    TrunkMonkey Well-Known Member

    It's not a Dynaflow. Looks like an ST400.

    That looks like a Rivi GS color.

    Ask if the ID plate is still on the side and if it has the "BS" code.

    And what is the status of that motor? (drooling, just ever so slightly...)

    Year? (it looks like a Switch Pitch input shaft with the oil hole)
    So, I am thinking it is a 1965.
     
    Last edited: Dec 12, 2018
    50nailbox likes this.
  3. 50nailbox

    50nailbox Member

    Apparently water got in It and seized it

    I asked him for the 2x4 intake,
    No dice he's gonna use it on a diff project

    I would of took the whole thing but I already have a seized 401
    And a 425 that I'm. Building up
     
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  4. TrunkMonkey

    TrunkMonkey Well-Known Member

  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    GranSportSedan and gsgtx like this.
  6. telriv

    telriv Well-Known Member

    Looks to me like a '64 TH400. See if the selector shaft is welded onto input shaft & if the electrical connector on the side has a single or double wire connector.
     
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  7. TrunkMonkey

    TrunkMonkey Well-Known Member

    Thanks, Larry and Tom.
    I stand corrected guys. On my laptop at home, the shaft "appeared to be fatter" but now I see it is narrow.
     
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Mike, I was looking at the stator splines. The Switch Pitch splines (on the right) are 1/2 as long as their Fixed Pitch counterparts. (on the left)

    FPvsSPSplineComparison.jpg
     
  9. TrunkMonkey

    TrunkMonkey Well-Known Member

    I see that in those pics, but I was not sure due to the angle on the image at the top and looking with my old man eyes too late at night and the shaft looked thicker, but then looking at it on my ginormous screen at work, I see it was an optical delusion.

    At least it's not a Dynaslow. :D
     
  10. 50nailbox

    50nailbox Member

    Well Larry the wizard. You know your stuff. Here's a better pic
    Its the one on the left (in your pics)
     

    Attached Files:

  11. 50nailbox

    50nailbox Member

    What's the difference between the two. Or is it pretty explanatory is the fixed /split term.
     
  12. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    If you look at the pictures, the second set of splines are for the torque converter stator. The switch pitch stator splines are 1/2 the length of the fixed pitch splines. That is one way to tell the difference between the 2 transmissions. Not sure if you know what a Switch Pitch is, not everybody does, but Buick guys are usually in the know:) Just in case, here is a description.

    http://www.buickperformanceclub.com/switchpitch.htm
     
  13. TrunkMonkey

    TrunkMonkey Well-Known Member

    upload_2018-12-12_15-41-1.png

    The splined area on the shaft is different length between the switchpitch and the fixed pitch. (1)
    The shaft width is different is different length between the switchpitch and the fixed pitch. (2)

    Larry posted faster than me, I was still scribbling with my crayons... :D
     
  14. 50nailbox

    50nailbox Member

    Thanks guys. One last dumb question

    What would be the best torq converter /stall be for this trans /425ci?
    (I'm still learning on the fly with the Nailhead)
     
  15. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    The torque converter selection is based on total combination. A stock converter works great with a stock engine. If you install a hotter cam, things can change. The best converter will be the purpose built one for your exact combination. The converter builder will need engine HP/TQ, gearing and car weight to build the best one for you. That doesn't come cheap like some off the shelf ones. Jim Weise sells some really nice converters and he knows Buicks. I recommend you contact him when you are ready.

    http://www.v8buick.com/index.php?threads/tsp-9-5-street-strip-converters-lifetime-warrantee.147066/
     

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