<VV> "Clunk" when shifting into gear, hard shifting

[iscdirector]

I did mention the spring. The low vacuum situation allows too much pump pressure to develop at idle thus breaking the spring, the e-clip, and loosening the pinion gear on the shaft. Cause and effect 

--- On Sun, 2/7/10, dennis dorogi <dfamily at fairpoint.net> wrote:


From: dennis dorogi <dfamily at fairpoint.net>
Subject: Re: <VV> "Clunk" when shifting into gear
To: "Edelstein and Payne" <eandp at mindspring.com>, virtualvairs at corvair.org
Date: Sunday, February 7, 2010, 9:33 AM


You might check out the article on Hard Shifting Powerglide by Bob Kirkman 
in the Corvair Tech Guide.  He writes: "Three corvairs in this area exhibit 
an extreme jolt when shifting from neutral to drive range.  And I do mean an 
extreme jolt! Another one comes during normal downshift into low range. It 
turns out to have nothing to do with the vacuum modulator or its vacuum 
source.  The problem is due to a broken cushion spring on the low band 
piston, the smaller spring that is secured to the piston.  This part is not 
available from GM, and I don't see it listed by any of the Corvair parts 
supplier.  It's necessary to appropriate one from another otherwise crippled 
transmission.  Drop the pan and remove the TV lever and internal levers. 
Remove the whole valve body and pull out the low band piston.  Remove the 
broken spring, install a good used one, and reassemble.  If you have not 
removed the TV lever and internal levers before, you will sweat a bit 
getting them back properly.  Oh, put a new O-ring on the lever shaft, and of 
course new gaskets on the valve body and on the pan. (1/92)"

My four door had this problem when I purchased it back in the 80's.  I 
followed Bob's instructions and sure enough the cushion spring was broken. 
Replaced it and no more hard shifting problems.  The Tech Guide is very 
useful.

----- Original Message ----- 
From: "Edelstein and Payne" <eandp at mindspring.com>
To: <virtualvairs at corvair.org>
Sent: Tuesday, February 02, 2010 9:10 AM
Subject: <VV> "Clunk" when shifting into gear


> Folks,
>
>    My 21 year old son uses a daily driver 65 coupe, 110 powerglide.  We've 
> kept it alive for a couple of years while we're finishing the 65 Monza 
> hotrod.  For some time it has made a "clunk" sound when you shift it into 
> drive or reverse.  It is now starting to get louder and I'm concerned that 
> at some point the car may not move.  I have checked the u-joints and they 
> don't seem to have a lot of play.  The motor and transmission mounts also 
> look okay and are not loose.  Is this likely to be something in the 
> hubs/wheel bearings or is it the differential???
>
>    Thanks for your help.
>
>               Travis Payne     65 Monza coupe
>               Raleigh, NC      65 500 coupe
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