#1  
Old 06-30-2022, 10:40 AM
Jonny Jonny is offline
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Default 1955. Jetaway problem

Hi all,
Im New to the group.
Im hawing a problem with my jetaway, when Its cold it will only drive in 1-2 not shift up.
After about 15-20 min it will, and it shifts as Its should and i Can ajust it so it shifts werry smoth.
Next day when cold Its the same again.
I think It is a valve that is hanging, am i reight ?
I realy apreciate all the help i Van get.
Thanks Jonny
From Denmark

  #2  
Old 06-30-2022, 10:46 AM
Jonny Jonny is offline
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Join Date: Jun 2022
Posts: 4
Default 1955 Jetaway problem

Hi all,
Im New to the group.
Im hawing a problem with my jetaway, when Its cold it will only drive in 1-2 not shift up.
After about 15-20 min it will, and it shifts as Its should and i Can ajust it so it shifts werry smoth.
Next day when cold Its the same again.
I think It is a valve that is hanging, am i reight ?
I realy apreciate all the help i Van get.
Thanks Jonny
From Denmark

  #3  
Old 06-30-2022, 05:00 PM
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Stuart Stuart is offline
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You can view a couple factory shop manuals for those early automatic transmissions on the http://www.pontiacsafari.com web page. Look in the 'Pontiac Garage' section, in particular there's one titled "The Hydramatic Transmission 1946-1955 On the Car Adjustment Service Manual".

  #4  
Old 06-30-2022, 05:43 PM
Poncho60 Poncho60 is offline
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Location: Northern Ill
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Just as FYI, the 55 trans is not a Jetaway. It is a dual range hydramatic and does not have park position on shift quadrant. The Jetaway is a dual coupling trans and not the same. Regards RA.

  #5  
Old 06-30-2022, 11:55 PM
Jonny Jonny is offline
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Thanks to both of you.
Yes i see now its not a jetaway, it is parked in R.
Thanks Jonny

  #6  
Old 07-01-2022, 12:40 AM
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Jack Gifford Jack Gifford is offline
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Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,176
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1955 Pontiacs came with a DualRange Hydramatic. Did someone change yours to a Dual Coupling Hydramatic?
Yes, a sticking valve in the valvebody could cause that symptom. Also, a fault in the governor could cause it.

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Last edited by Jack Gifford; 07-01-2022 at 12:50 AM.
  #7  
Old 07-01-2022, 04:00 PM
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Bill Eveland Bill Eveland is offline
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if there is no P and only reverse than its definately a dual range hydro

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  #8  
Old 07-01-2022, 07:20 PM
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stevep stevep is offline
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It sound like you have leaking seals in the rear clutch, which means it's overhaul time.

But, you can try some Lucas additive and see what happens as you have nothing to lose.

I am very familiar with these transmissions

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  #9  
Old 07-11-2022, 05:39 AM
Jonny Jonny is offline
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I have been driwing a litle bit in the car now.
Now the problem is only in fourth gear, it slips ore will not shift to fourth.
when its hot, it driwes just as it should, and also kicksdown as it should.
I will take of the pan and check all that i can from there, i hope i dont have to take it out of the car.
I will try Lucas also.

Thank you fore your soport guys.

  #10  
Old 07-11-2022, 06:49 PM
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stevep stevep is offline
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4th gear is the front and rear clutch. 3rd is the front clutch and the rear band so you have a rear clutch issue and the only way to fix it is to properly rebuild the transmission.
There is not much that you can do in the pan to rectify this issue.

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