<VV> "Clunk" when shifting into gear

[iscdirector]

Timothy, I sent this response to Dennis earlier which explains why it often breaks. Certainly age and fatigue are a factor on most of the parts on our cars:
"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, shortle <shortle556 at earthlink.net> wrote:


From: shortle <shortle556 at earthlink.net>
Subject: Re: <VV> "Clunk" when shifting into gear
To: "dennis dorogi" <dfamily at fairpoint.net>, "Edelstein and Payne" <eandp at mindspring.com>, virtualvairs at corvair.org
Date: Sunday, February 7, 2010, 12:45 PM


Does that spring break do to another fault? Or is it a metal fatigue or old age issue? And is this spring potentially found elsewhere besides the Corvair PG?
Timothy Shortle in (snowing) Durango Colorado


-----Original Message-----
>From: dennis dorogi <dfamily at fairpoint.net>
>Sent: Feb 7, 2010 7:33 AM
>To: Edelstein and Payne <eandp at mindspring.com>, virtualvairs at corvair.org
>Subject: Re: <VV> "Clunk" when shifting into gear
>
>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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>
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