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'58 TF A466 Not upshhifting when warmed up
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Myke
Posted 2022-03-25 12:37 AM (#620467)
Subject: '58 TF A466 Not upshhifting when warmed up



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Hey all, i just took the '58 out on its maiden voyage after sitting during a restore. I had put Dex/Merc in as that what i belevied was the correct fluid, I drove to the local sonic with only a minor issue of a weird 2-3 shift that i thought might have been from a kickdown being out of adjustment as it happened really soon after 1-2. And on the way home, I was suddenly having a problem of not upshifting at all, i was able to get a 1-2 shift by reving then letting off, but no 2-3. I pulled in and checked the fluid level and it was full, but it seemed pretty thin to me, is it possible that the wrong fluid is causing these issues? or something bigger? thanks!
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Shep
Posted 2022-03-25 8:53 AM (#620468 - in reply to #620467)
Subject: Re: '58 TF A466 Not upshhifting when warmed up



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I don't think fluid is the issue,, start with getting the throttle linkage adjusted by the book.
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wizard
Posted 2022-03-25 11:33 AM (#620473 - in reply to #620467)
Subject: Re: '58 TF A466 Not upshhifting when warmed up



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Which Dexron did you use.
Agree that you must confirm the throttle linkage adjustmen.
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57chizler
Posted 2022-03-25 12:22 PM (#620475 - in reply to #620467)
Subject: RE: '58 TF A466 Not upshhifting when warmed up



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If it short-shifted to 3rd when cold and doesn't shift to 3rd when warm, I don't think it's linkage related; more like a governor problem.
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Myke
Posted 2022-03-25 3:59 PM (#620481 - in reply to #620473)
Subject: Re: '58 TF A466 Not upshhifting when warmed up



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wizard - 2022-03-25 8:33 AM

Which Dexron did you use.
Agree that you must confirm the throttle linkage adjustmen.


Just Valvoline Dex/Merc I think it said dex IV but I can't remember 100% what it's equivalent was

As for the kickdown link I'll definitely start there as I remembered that I had taken it completely off for the engine bay repaint and then never adjusted it when I put it back on
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wizard
Posted 2022-03-25 5:45 PM (#620484 - in reply to #620467)
Subject: Re: '58 TF A466 Not upshhifting when warmed up



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You should only use Dexron III
You should not drive the car with wrong adjusted or not mounted throttle linkage as this might damage the transmission.
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56D500boy
Posted 2022-03-25 11:14 PM (#620489 - in reply to #620481)
Subject: Re: '58 TF A466 Not upshhifting when warmed up



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Myke - 2022-03-25 12:59 PM
As for the kickdown link I'll definitely start there as I remembered that I had taken it completely off for the engine bay repaint and then never adjusted it when I put it back on


I previously got schooled on "kick-down" versus throttle pressure when I was working on my A-466 swap into my 56 Dodge. It is a mechanical way to tell the transmission what is going on load versus speed/throttle position. Nowadays, that information is translated as a electrical signal to the transmission computer. Back then (the 50's), this information was analogue/mechanical but it helped the transmission to mechanically "decide" to stay in that gear or upshift or downshift, as appropriate. It is not optional, it is necessary.

wizard - 2019-01-25 11:24 PM
Kickdown is a function in automatic transmissions, so the term kickdown is correct.
However, the most important function for the throttle valve linkage is to supply compensated throttle pressure.

example, let's assume that the accelerator pedal movement is restricted by the carpet so that a kickdown cannot occur- if the throttle valve linkage is otherwise correctly adjusted, this condition won't damage the transmission.

If the throttle valve is wrongly, adjusted kickdown might occur, but at wrong speed/pressure. In this condition, or if the linkage is missing, the risk of damages are very high.

So, adjust the linkage properly.

You might call a duck cat, but don't expect it to swim well


REFERENCE: http://www.forwardlook.net/forums/forums/thread-view.asp?tid=70541&...



Edited by 56D500boy 2022-03-25 11:16 PM
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1960fury
Posted 2022-03-26 9:18 PM (#620496 - in reply to #620484)
Subject: Re: '58 TF A466 Not upshhifting when warmed up



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wizard - 2022-03-25 5:45 PM


You should not drive the car with wrong adjusted or not mounted throttle linkage as this might damage the transmission.


I second that!
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Myke
Posted 2022-03-27 7:44 PM (#620517 - in reply to #620468)
Subject: Re: '58 TF A466 Not upshhifting when warmed up



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Shep - 2022-03-25 5:53 AM

I don't think fluid is the issue,, start with getting the throttle linkage adjusted by the book.


look like this is the issue, i changed the position of thekickdown and it is now shifting agian, little bit of fine tuning on it and i should have the shift rightwhere they need to be. Thank All!
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