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Old 08-26-2020, 08:11 PM
mr67gp mr67gp is offline
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Default 1957 - Transmission noise/issues after fluid drain & refill

I drained and dropped the pan on the Chieftain renewed the gasket, and refilled with ATF. Now she does not like to up shift out of first and there is an odd rattle/knock at the front upper quadrant of the bell housing.

Car/trans has 34k miles. Only reason for the service was the leaking pan gasket.

What'd I mess up?

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1967 GP HT 428
1967 GP convert 428
1957 Chieftain 4D HT
  #2  
Old 09-16-2020, 01:11 AM
59safaricat 59safaricat is offline
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Did you ever find the solution to this problem?

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Old 09-16-2020, 08:29 PM
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You didn't mess anything up. Your torus cover may have broken. It is a common issue in these transmissions.

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Old 09-16-2020, 10:42 PM
59safaricat 59safaricat is offline
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There's an o-ring on the transmission pickup tube for the filter on dual coupling transmissions. If the filter was removed and disturbed this old crusty o-ring, it could have lost its sealing properties causing a fluid starvation issue. Very cheap and simple fix

https://youtu.be/nvLshdrFoWc?t=1579

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Old 09-17-2020, 06:01 PM
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If that O ring was damaged, the car would not move.

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Old 09-18-2020, 08:16 PM
59safaricat 59safaricat is offline
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The o-ring could be partially damaged and have enough line pressure to get the car moving but not enough for proper operation. It's worth a try.

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Old 09-20-2020, 07:58 PM
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Quote:
Originally Posted by 59safaricat View Post
The o-ring could be partially damaged and have enough line pressure to get the car moving but not enough for proper operation. It's worth a try.
Apparently you have never rebuilt one of these transmissions.
It doesn't work that way.
A gauge connected to the line pressure tap will confirm what the line pressure is and if you have line rise when you stab the throttle.
I just rebuilt a 56 Cadillac transmission with a defective pump and it had 35 PSI of line and shifted fine.

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Old 09-22-2020, 01:21 AM
59safaricat 59safaricat is offline
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I'm always a fan of checking the easy/cheap areas first since most problems generally stem from that arena. Seems like horrific odds that the torus cover cracked immediately after a fluid change. Not saying it's impossible but....

Never rebuilt one of these transmissions but watched the one in my 1959 Pontiac torn down and rebuilt by an old guy back in 2009 who went to school at Hydramatc in 1958. I asked a lot of questions during the process. He was a walking encyclopedia about these transmissions.

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Old 09-22-2020, 07:11 PM
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I have been rebuilding them since the early 80s and I run a shop that specializes in vintage transmissions. The cover is a common failure and the dampener springs in the main bowl are known to break.
I am also the POCI Transmission tech Advisor.

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Old 09-23-2020, 08:16 AM
mr67gp mr67gp is offline
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Hey Guys - thanks for picking this back up.

I have not resolved this yet, mostly due to a lack of time. I do think I may have over-filled the transmission, and will double check that next time I can get it running (see other thread on fuel filter bowl gasket blues). Would this cause an issue? The mechanical rattling up front seems to indicate otherwise.

Steve - How can I confirm the torus cover condition? Is R&R the only way?

The car goes into gear (R & D) no problem, but does not shift properly in Low range, but high range it behaves differently.

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Old 09-24-2020, 08:58 PM
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Jim, a defective coupling cover will case a no 2nd or 4th condition and the transmission will make 1 upshift.
I am supposed to be in the Delaware Water Gap in 2 weeks if that helps.
Overfilling will not cause anything but foaming and venting.

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Old Yesterday, 06:09 PM
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You cant over fill them..

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Old Yesterday, 06:09 PM
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Did you drain the coupling?

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Old Yesterday, 08:06 PM
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Quote:
Originally Posted by 389 View Post
You cant over fill them..
Please explain that statement.

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