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Old 03-03-2019, 10:20 PM
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ST400 No high stall

I'm running a ST400 behind a 401 nailhead in my 34 Ford. I rebuilt and modified clutch feed before install. Trans works great except,,, not able to change stall on converter. Converter solenoid clicks when voltage applied. I've rebuild and modified many 400s but this is the first ST. Does anyone know if there is suppose to be an O ring on the stator support or some place else that I might have missed?

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Last edited by Crosley; 03-04-2019 at 05:44 AM.
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Old 03-04-2019, 01:58 AM
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Head over to the JalopyJournal.Com to the HAMB section, and look up member squirrel. He has a couple and seems to help out others having problems with theirs. junior stocker.
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Old 03-04-2019, 05:46 AM
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Quote:
Originally Posted by Stump34 View Post
I'm running a ST400 behind a 401 nailhead in my 34 Ford. I rebuilt and modified clutch feed before install. Trans works great except,,, not able to change stall on converter. Converter solenoid clicks when voltage applied. I've rebuild and modified many 400s but this is the first ST. Does anyone know if there is suppose to be an O ring on the stator support or some place else that I might have missed?
Is the sealing ring in place on the input shaft ?

Was this a complete switch pitch T-400 or did you install a switch pitch pump assembly and input drum into a regular T-400 trans? There is an oil pressure port in the case the switch pitch needs to operate.
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Old 03-04-2019, 08:58 AM
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How about some more basic questions.

Has this trans ever run before, or did you put it in the car and just now tried it out?

Has the trans been rebuilt or is it used?

Is the converter correct?

I recently rebuilt a switch pitch TH400, and had to change the case. Crosley is correct about the special orifice plug in the port that feeds oil to the converter. Normal 400s just have an open port. Switch Pitch transmissions have a 1/4" plug with an 0.040" orifice.



If this is a used trans, it's possible that there is some crud in that passageway that is blocking the orifice. And as Crossley also correctly points out, there is a seal ring on the input shaft that is unique to the Switch Pitch pump and converter. This is not typically included in rebuild kits. I had to search on line for a source.
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Old 03-04-2019, 09:14 AM
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St400

Thanks Crosely and jrstocker. yes this is an original ST from a 65 Rivi. I gave it a total rebuild including dual feed for clutches Torrington rear thrust etc. l done this to lots of 400s.Trans was installed and all things work well except no pitch change when voltage is applied to the solenoid. the solenoid clicks. I'm sure the sealing ring is the problem. I just not sure where it goes and can't find out. I will check Jalopyjournal.com.
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Old 03-04-2019, 07:17 PM
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Quote:
Originally Posted by Stump34 View Post
Thanks Crosely and jrstocker. yes this is an original ST from a 65 Rivi. I gave it a total rebuild including dual feed for clutches Torrington rear thrust etc. l done this to lots of 400s.Trans was installed and all things work well except no pitch change when voltage is applied to the solenoid. the solenoid clicks. I'm sure the sealing ring is the problem. I just not sure where it goes and can't find out. I will check Jalopyjournal.com.
Sealing ring is near the base of the input shaft, where the shaft is pressed into the drum. I have switch pitch shafts if a photo is needed.
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Old 03-05-2019, 03:37 PM
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Found the problem with Switch Pitch

If you think about something long enough you can convince yourself of anything. I couldn't remember putting the sealing ring on the input shaft so I must have left it out. Right? Took it apart and there was the ring where it should be. I did however find the problem. It was a gnat. Sure enough a gnat turd had plugged up that little .040 hole in the cup plug in the front of the case. Just remember, ya think long ya think wrong. Thanks for the advice.
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