Transmission Control Detent Switch - 64 Buick Special V8 300 Cid

Discussion in 'The "Juice Box"' started by Chris Mulloy, Jul 7, 2017.

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  1. Chris Mulloy

    Chris Mulloy Active Member

    Need some HELP!!!!!! 64 Buick Special V8 - 300 CID - 2 speed power glide. Changed out the original two barrel intake to a four barrel intake. Installed a new Edelbrock four barrel Carb model 1403. I have no idea on how to hook back up the Transmission Control Detent Switch. I have included some pictures of the original set up, what it looks like now, and pages from the manual. This rod pushes BACK into the solenoid as you accelerate. New travel distance is different from the old carb as you accelerate. Any Help would be appreciated. First attempt on restoring a car!!!!!!


     
    Chris Mulloy, Jul 7, 2017
    #1
  2. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    None of your links work?



    Derek
     
    300sbb_overkill, Jul 7, 2017
    #2
  3. Chris Mulloy

    Chris Mulloy Active Member

    Sorry will have to figure out whats going on. I pull it up and all the pictures are there in the post.
     
    Chris Mulloy, Jul 7, 2017
    #3
  4. Chris Mulloy

    Chris Mulloy Active Member

    Chris Mulloy, Jul 7, 2017
    #4
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    First, if it is the original transmission, it's a Super Turbine 300 (ST-300), NOT a Powerglide. I believe the switch pitch feature for this transmission didn't debut until 65, but I am not sure on that. I know the ST-400 switch pitch was from 1965-67. The kickdown is electrical, and very simple, send 12 volts to the contact on the driver's side of the transmission, it down shifts. The switch pitch feature works the same way, 12 volts changes the converter to high stall, take it away, low stall. Both of these features were controlled by a throttle mounted switch/plunger. The switch gets ignition on 12 volts, and sends it down to the transmission at the appropriate throttle opening. You can test the switch with a multi meter or test light to see if/when it is working. Below is what the switches look like. The second switch was only on the switch pitch to turn on high stall at closed throttle. Again, not sure if the ST-300 had that in 64.
     

    Attached Files:

    LARRY70GS, Jul 7, 2017
    #5
  6. Chris Mulloy

    Chris Mulloy Active Member

    Larry thanks for the post. I'm hoping the pictures come through this time. I will check with my father in law on if its the original transmission. He has told me over and over its a power glide. I know the Detent Switch works I just don't know how to hook it back up to the new Carb. Any ideas?

    Thanks

    Chris


    IMG_3110.jpg IMG_3210.jpg 64 Buick 2.jpg 64 Buick.jpg
     

    Attached Files:

    Chris Mulloy, Jul 7, 2017
    #6
  7. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Chris, it's a very common thing to confuse the 2 transmissions, they are both 2 speed transmissions, I hear it all the time, usually from non-Buick guys. The plunger moves out with throttle opening. You are going to have to get inventive to attach it to the new carburetor. Find out how WOT aligns with the fully extended plunger switch and see if you can devise how to attach the two. I am sure you aren't the first to encounter this problem. Obviously, this carburetor wasn't designed with the plunger switch in mind.
     
    LARRY70GS, Jul 7, 2017
    #7
  8. Chris Mulloy

    Chris Mulloy Active Member

    I have an idea and it works, but the issue is the new carb pulls back a lot more than the old one. Meaning it will not allow me to go full throttle if I have the detent switch plunger hooked up . My thought is to make a new end piece with a more oblong circle at the end. So as you press on the gas it will slide in the oblong circle until it gets to a place that it will depress the plunger all the way back even with the carb to full throttle. What's your thoughts on that?

    Thanks

    Chris
     
    Chris Mulloy, Jul 7, 2017
    #8
  9. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I would think that plunger arm screws in and out of the switch, so you can shorten and lengthen it. Looks to like the transmission is not a switch pitch. Is that a 1964 Buick chassis manual or other year.
     
    LARRY70GS, Jul 7, 2017
    #9
  10. Chris Mulloy

    Chris Mulloy Active Member

    Below is what I had done. Think I need to make the oblong circle at the end of the plunger longer so I can go full throttle. The screw would slide through the circle to it caught the end of it.

    IMG_3219.jpg
     
    Chris Mulloy, Jul 7, 2017
    #10
  11. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Looking at your stock picture, it looks as though the plunger extends, it doesn't move in, as the throttle opens.
     
    LARRY70GS, Jul 7, 2017
    #11
  12. Chris Mulloy

    Chris Mulloy Active Member

    Its a 64 manual
     
    Chris Mulloy, Jul 7, 2017
    #12
  13. Chris Mulloy

    Chris Mulloy Active Member

    It pushes in to the plunger, but will only go so far in. The travel distance of the new carb at full throttle is like twice that of the old one. So the plunger stops at a point going in thats only like 50% throttle
     
    Chris Mulloy, Jul 7, 2017
    #13
  14. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Look at your original picture with the stock carburetor. It looks to me like the plunger extends not retracts with throttle opening. Not sure, but it appears that way.
     
    LARRY70GS, Jul 7, 2017
    #14
  15. TrunkMonkey

    TrunkMonkey Totally bananas

    64-67 ST300 had Switch Pitch.

    The blades on the switch on the tranny are 90 degrees (one verticle, one horizontal).

    _
    |
    Like this


    I have my engine and transmission out (300 2bbl, ST300 SP 1964 Skylark Convertable) and if you need any pictures of anything, let me know.
     
    TrunkMonkey, Jul 7, 2017
    #15
  16. Chris Mulloy

    Chris Mulloy Active Member

    I agree it looks like it. I have gone back twice and put it back on the car because I thought the same thing. It does pull back believe it or not.
     
    Chris Mulloy, Jul 7, 2017
    #16
  17. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    I believe you, just wanted to make sure we aren't chasing our tails.:D You are on the right track, you'll have to coordinate the travel of the switch with full travel of the throttle. You might need to connect it at a different point on the throttle arm, or move the switch.
     
    LARRY70GS, Jul 7, 2017
    #17
  18. BrunoD

    BrunoD Looking for Fast Eddie

    The fact is the Powerglide will not bolt on to the Buick motor,the bell housing is different,and then the powerglide did not have the switch pitch,this is for other guy's that are wondering.Bruno.
     
    BrunoD, Jul 7, 2017
    #18
  19. BRUCE ROE

    BRUCE ROE Well-Known Member

    I believe both carb shafts rotate about 90 degrees. The old one had a pin a certain
    distance (radius) from the the center of rotation, and at a certain angle to translate
    to the linear distance the switch needs. All you need to do is measure off the same
    radius and angle on the new carb shaft and make a bracket to put a pin there. Oh,
    and adjust the plunger length if the carb throttle shaft has been repositioned.

    As for me, I'd throw that stuff away and put on an electronic switch pitch
    controller. Bruce Roe
     
    BRUCE ROE, Jul 8, 2017
    #19
  20. 300sbb_overkill

    300sbb_overkill WWG1WGA. MAGA

    Does the 4bbl plunger/switch have more travel than the 2bbl one? If so perhaps try to see if one is available by posting in parts wanted? GL


    Derek
     
    300sbb_overkill, Jul 8, 2017
    #20
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