Typically, these will leak due to the gasket being uneven or overtightening (usually the latter).  I have never needed sealant to stop leaking, however, I have needed to replace the pan.

Cheers, 

Jeff

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Richard Smith
Sent: Wednesday, April 08, 2015 11:08 AM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: AT leakage '91 GL

My (rebuilt) AT Œweeps¹ too. It was professionally done, by a reputable rebuilder. The mechanic who sent it out for the rebuild has tightened things up as best he can, and my new (local) mechanic, has also made an effort. His synopsis is - ³those automatic transmissions always leak a little bit, get in the habit of checking the level.² I am ok with doing that. It is a tiny amount (a tablespoon per week, typically, in a dot on the garage floor) and doesn¹t seem to amount to any serious expense. Of all the things I could worry about (ahem, rust, ahem), this is not a serious one for me.

Šr

On 2015-04-08, 10:45 AM, "Stuart MacMillan" <stuartmacm@GMAIL.COM> wrote:

>Annoying, isn't it?  I've tightened the pans on both the vans I work on 
>and they still weep a bit.  One is even a recently rebuilt unit from 
>German Transaxle.  I think there are too few bolts, and the sheet metal 
>pan just deforms around the ones that are there and the seal breaks 
>between them.
>
>Next step for me is a LIGHT application of the "Right Stuff" to both 
>surfaces and a new gasket.  You don't want any caulk squeezing into the 
>pan where it can break off and cause all sorts of problems.
>
>Stuart
>
>-----Original Message-----
>From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf 
>Of Larry Alofs
>Sent: Tuesday, April 07, 2015 9:43 AM
>To: vanagon@GERRY.VANAGON.COM
>Subject: AT leakage '91 GL
>
>Does anyone wish to offer some clues or suggestions about how to 
>install the bottom pan on a vanagon AT without leakage.
>  Generally I have held to the belief that clean straight surfaces and 
>a new gasket should be enough and silicone, etc. should not be needed.  
>In the case of my current project, however, I may have to conclude otherwise.
>What works?
>
>Larry A.
>  too many vangagons, too little time