727 won't upshift 1-2 or 2-3 without lifting throttle?

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    Author Topic: 727 won't upshift 1-2 or 2-3 without lifting throttle?  (Read 3057 times)

    Offline droptail

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      • droptail
    727 won't upshift 1-2 or 2-3 without lifting throttle?
    « on: September 29, 2019 - 03:31:30 PM »
    Been working fine 1.5 years ( except for 2-3 flareup below) and out of the blue I went to return home after 1 hour cool down and it wouldn't upshift (1-2 & 2-3) until I lifted throttle. 
    Linkage & throttle lever shaft function looks correct. 
    Fluid level good.
    First & reverse fine.
    history:  40k mi on rebuild 35 years ago. 
    Transgo shift kit 1.5 year/5k miles ago.  never got rid of a (mild) 2-3 flareup subsequent to kit install.   
    I plan on going over the linkage adjustment again, then dropping pan to take a look see. 
    Any ideas? 

    thanks
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    Offline 73440

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    Re: 727 won't upshift 1-2 or 2-3 without lifting throttle?
    « Reply #1 on: September 29, 2019 - 08:05:54 PM »
    May want to check the kiçkdown band adjustment.
    A good reference book is HP Books Torqueflite A-727 Transmission Handbook by Carl H Munroe
    « Last Edit: September 29, 2019 - 08:39:10 PM by 73440 »
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    Offline 70chall440

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    Re: 727 won't upshift 1-2 or 2-3 without lifting throttle?
    « Reply #2 on: October 01, 2019 - 04:48:58 AM »
    I had similar problems in my Challenger, ended up having to drop the valve body and found it to be gummed up and the spring for the 2-3 shift was a bit corroded. If the car sits a lot, this can be an issue. If this problem just materialized, then it is most likely not the line pressure (kickdown), its internal I believe.
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    Offline Chryco Psycho

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    Re: 727 won't upshift 1-2 or 2-3 without lifting throttle?
    « Reply #3 on: October 28, 2019 - 01:44:00 PM »
    If I had ever owned a car with an Auto trans that is exactly how I would want it to work so I could decide when to shift not having it decide for me which I cannot stand
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    Offline jimynick

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    Re: 727 won't upshift 1-2 or 2-3 without lifting throttle?
    « Reply #4 on: October 28, 2019 - 06:26:39 PM »
    C'mom Neil, don't hold back; tell him how you really feel!  :thumbsup:
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