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Canadian Poncho Homepage -> Canadian Poncho -> Pre 1958 Canadian Pontiac Power Train Tech Forum -> 400 Transmission shift points
Post Info TOPIC: 400 Transmission shift points
67-Beaumont


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400 Transmission shift points
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Hello ,

I have a hydro 400 Transmission . 
1St to 2nd gear shifts at 40 k thats okay 

2nd to 3rd shifts at 80 k which is to high 

I would like to lower that to 60 k 

which spring would I use to lower the shift point (colour of spring ) 

thanks 



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koolconvertible


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Can you install an adjustable modulator?

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cutting a roof off a four door is NOT a convertible.....

65 Parisienne convertible.one of 49 built for RHD export market,402BBC, T400, 2500 stally, posi rear, upgraded brakes with front discs, FUEL FAST efi custom built by me.
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67-Beaumont


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Hello ,
It has a governor on the side of the transmission it has spring in it and if you change the springs
The shift points will change . Just need to know the springs to use .
Apparently the springs are colour coded.

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cdnpont


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A quick look on line found me this,

And from what I understand, the primary adjustment is in the weights. Lighter=Later shifts, with the springs fine tuning the points. I always thought my 400 was awfully early with the stock governor, but I just got used to it.

Not sure if these are the universal spring colours in general use.

400 spr.JPG

 



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
a421cat


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Good info to know when I set up the shifts on my 421 car. Thanks for the info Mark.

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SGS Welding


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I AM NO EXPERT 

But what I learned while adjusting mine is a few things

1 whatever you adjust on the governor ( weights or springs or both)

it changes BOTH shifts 

You can buy a kit 

or you can adjust what you have 

using 6d nails to replace the pins

the hard part will be finding springs without buying a kit

lots of info online

Greg



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67-Beaumont


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Hello ,
Thanks for all the good information,
Just have to get a few different spring sets and start a test and tune .
Thanks again .

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67-Beaumont


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This is a great forum
Lots of information and great replys when I have a question
Thanks again

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67-Beaumont


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Thanks Mark for you information 

stay safe 



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SGS Welding


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41E913F0-BD5C-4B4D-A66C-3A6FE9C60D86.jpegCE354D8A-A4AE-4633-9B99-86A76CBAA453.jpeg

Couple pics of my before and after



-- Edited by SGS Welding on Friday 22nd of October 2021 12:50:52 PM

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67 Parisienne Convertible 

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Prefectca


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Make sure that you have a good vacuum signal to the modulator valve. A split in the rubber line at the modulator valve can cause the shift points to be too high.

Paul

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cdnpont


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And buy an adjustable modulator.



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
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67-Beaumont


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Hello 

thanks for the pictures,

I will change the springs , what spring did you use 

did it lower the shift point or increase the shift point 

thanks 



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67-Beaumont


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Hello 

I do have an adjustable valve , I adjusted it and it did soften the shift .  The hose is good I checked it

Thanks for the great information,

 

 

 



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seventy2plus2


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SGS Welding wrote:

41E913F0-BD5C-4B4D-A66C-3A6FE9C60D86.jpegCE354D8A-A4AE-4633-9B99-86A76CBAA453.jpeg

Couple pics of my before and after



-- Edited by SGS Welding on Friday 22nd of October 2021 12:50:52 PM

 Which is before, which is after?   It looks like one is blue (or maybe purple), and one is green.



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cdnpont


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I see a heavier weight with the same spring, lower image.



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seventy2plus2


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cdnpont wrote:

I see a heavier weight with the same spring, lower image.

 Now that I'm on a different device I think I see the same thing.



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SGS Welding


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Sorry for the confusion 

top pic is the modified inner weight

springs were never changed

Also this governor is for a turbo 350

But from what I understand the part is the same

only difference being the gear on the end and the fact that it

rotates in the opposite direction 



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67-Beaumont


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Hi Greg 

Thanks for the information 

I will just have to play with the springs to get a good shift point.

great information 

stay safe 

c



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