<VV> "Clunk" when shifting into gear

[iscdirector]

This is an issue that I have seen a lot with corvairs that have been well used and have spent some time researching the problem. Probably your car does not idle smoothly when the car is stopped in gear with the brake applied and the down shift from 2nd to 1st when approaching a stop is quite noticeable. First check the transmission throttle valve adjustment per the shop manual instructions. Then check is the modulator with a mighty vac to be sure it is good. If that is ok get a hand held vacuum gage start the engine and check the inches of vacuum at the modulator, it needs at least 15Hg of vacuum to lower the fluid pressure in the transmission as it is supposed to, a healthy engine will usually have 16Hg to 17Hg of vacuum. If your vacuum is to low you will have to repair the valve train to get the required amount. Also if the car has been used for awhile with low engine vacuum conditions it is very common for the low band cushion spring to be broken
 which will make the clunk real bad. Another situation created by low vacuum or a bad modulator is the pinion gear coming loose on its shaft, this creates a noise like the U-joints are bad when they are OK.
--- On Tue, 2/2/10, Edelstein and Payne <eandp at mindspring.com> wrote:


From: Edelstein and Payne <eandp at mindspring.com>
Subject: <VV> "Clunk" when shifting into gear
To: virtualvairs at corvair.org
Date: Tuesday, February 2, 2010, 9:10 AM


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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