<VV> Differential Lube Level change

Doug Mackintosh dougmackintosh at yahoo.com
Sat Oct 10 12:49:50 EDT 2009

If the return hole between the manual transmission and differential is plugged (or the gasket between diff and tranny is installed wrong, blocking the hole) one unit can pump fluid into the other unit, and it will not drain back to equalize the level. I thought it would leave the transmission overfilled and the differential low, but maybe it works both ways?
 -- Doug Mackintosh
Corsa member since 1996
Corsa/NC member since 1996, Virtual Vairs member
Corvair owner 1969-1971 and 1996-on 

From: shortle <shortle556 at earthlink.net>
To: Doug Mackintosh <dougmackintosh at yahoo.com>; Virtual Vairs <virtualvairs at corvair.org>
Sent: Saturday, 10 October, 2009 12:24:59
Subject: Re: <VV> Differential Lube Level change

My differential oil seems to be overfilled on my Rampside. Before going to Kansas I removed as much oil as I could (no drain plug on case) and installed 1 new quart of 90 wt. oil. This brought the oil level just below the plug. 1500 miles later I did an engine oil change and noticed the trans oil level was about a quart low and the differential was again overfilled. My trans has no leaks anywhere (pipes, hoses, cooler, pan, etc.). When I look at the gear oil I don't notice any redness in the fluid but I know something is not right. Vehicle is performing very well with no unusual noises or any other symptoms.Has anyone seen this before?
Timothy Shortle in Durango Colorado
1963 Rampside 95HP, 3.55 w/ '64 case, PG
Owned since 1980
Getting it ready for Palm Springs in 11 days

-----Original Message-----
>From: Doug Mackintosh <dougmackintosh at yahoo.com>
>Sent: Oct 10, 2009 9:57 AM
>To: Virtual Vairs <virtualvairs at corvair.org>
>Subject: <VV> Differential Lube Level change
>On page 16 of the October Communique there is a tech tip on a running change in the location of the differential fill plug in 1962. It refers to a March 1962 Service bulletin. When I look at my copy of Chevrolet Service News (the excerpts sold by Clarks) I cannot find this bulletin. Does anyone have a copy they can share with me?
> -- Doug Mackintosh
>Corsa member since 1996
>Corsa/NC member since 1996, Virtual Vairs member
>Corvair owner 1969-1971 and 1996-on 
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