runaway on 2-3 upshift ('57 Torqueflite)

[Philippe Courant <accf-club@xxxx>]

hi,
After my squealing brakes problem (i have no time since monday to fix 
it...) i had also another problem (which in fact i 've since i 
overhauled the trans. some years ago but more noticeable this damned 
monday) : an overspeeding of the engine every time the trans. upshifts 
from 2 to 3. Only a 1/2 second but not a very good thing for the engine 
.. As you think the runaway is much noticeable if the upshift occurs at 
a higher speed.
If i look at the trasnmission power flow i note that when the trans must 
shift from 2 to 3 you must have simultaneously a disengagement of the KD 
band and an apply of the rear clutch (front clutch remains engaged). it 
seems that on my car the two actions are not simultaneaous... Why ? 
Problem with the 2-3 shift valve or the "shuttle valve". Or anything else ?

Oil level is OK. Transmission has 4000 miles since overhaul. No slippage 
, no problem on 1-2 upshift.

I have also a "forced kick down" problem (no KD ..) but i'll explain it 
on a next message

--

Philippe COURANT (Pau, France)- Webmaster des sites ACCF et C-I-F
Imperial 1957 Crown convertible
Buick 1996 Roadmaster wagon

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