[FWDLK] runaway on 2-3 upshift ('57 Torqueflite)
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[FWDLK] runaway on 2-3 upshift ('57 Torqueflite)



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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