Switch Pitch

[Guenther,Max]

I'd have to agree.  I did not know what it was for in my 63 Riviera.
Substituted a 65 Riv engine and trans and did not connect the Variable
pitch switch.  Had to idle it up kinda high so it would idle in gear.
Chirped everytime I went from park to drive.  Once I found out what it
was it turned out to be very smooth.

>-----Original Message-----
>From:	Jim Davies [SMTP:jimd at vcc.bc.ca]
>Sent:	Tuesday, January 26, 1999 12:34 PM
>To:	diy_efi at efi332.eng.ohio-state.edu
>Subject:	Re: Switch Pitch
>
>
>
>On Tue, 26 Jan 1999, Robert Harris wrote:
>
>> The switch pitch convertor was used to replace low gear of the four speed
>> hydramatic transmission when GM upgraded the design to the
>>"Turbo-Hydromatic"
>> and was available only with the 400 and only on the heavier cars.  
>> 
>> Not so much a starting gear as a "passing" gear.  Nice smooth "downshift"
>> unlike shifting gears - so as to not disturb the passengers and simply
>> smoothly allow a nice increase in power to swoop around the peasants.
>> 
>VP convertors did give a noticeable diiference at lower speeds and they
>were easily rewired to be switched low/high at will. Oddly enough, their
>reason for existence was to reduce creep when idling in gear with the car
>stopped.
>
>