Thread Number: 75382  /  Tag: Vintage Automatic Washers
Transmission gaskets
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Post# 992228   4/26/2018 at 16:43 (180 days old) by DADoES (TX, U.S. of A.)        

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When opening a transmission for service, what's the best choice for sealing it on reassembly?  I've read/heard recommendation to use a product such as Permatex Blue RTV Silicone Gasket Maker.  Or is cutting a new gasket of cork a better choice?

Post# 992274 , Reply# 1   4/27/2018 at 05:09 by potatochips (Nova Scotia)        

Id try either of those, but Id choose cork over the goo as nothing is better than a cut to fit gasket. In an industrial application I have experience with Garlock gasket material. They make rubber or compressed non asbestos gaskets which are excellent to use in general purpose applications, can handle lots of heat and pressure nicely. Something else worth considering.

Post# 992280 , Reply# 2   4/27/2018 at 07:06 by combo52 (Beltsville,Md)        
Transmission Gaskets

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If the cover was glued on originally such as a WP DD transmission differently reassemble it the same way, the thickness of a gasket will cause the cover to bend and could cause aliment problems.


On WP BD and older MT Pittman style transmissions these transmissions originally used cork gaskets but the manufactures both switched to paper gaskets LONG ago and the paper gaskets worked a lot better.


Cork would usually be my last choice and probably the poorest performing material as well, there are so many other good gasket materials out there if you have to make your own.


John L.

Post# 992288 , Reply# 3   4/27/2018 at 09:49 by DADoES (TX, U.S. of A.)        

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It's a WP DD transmission circa 1999.  Need to install a neutral drain kit.  Should the oil be changed?

Post# 992290 , Reply# 4   4/27/2018 at 09:54 by combo52 (Beltsville,Md)        
WP DD transmissions

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Differently NO gasket, just use RTV type sealant, I would change the oil unless it looks clear and clean.

john L.

Post# 992291 , Reply# 5   4/27/2018 at 10:25 by DADoES (TX, U.S. of A.)        

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Allrightythen, thanks!

I also found a video on YouTube of a repair guy doing a neutral drain kit.  He changes the oil, and uses Permatex Ultra Black (which says "maximum oil resistance").  I bought Permatex RTV yesterday but can exchange it for the Ultra Black.

Post# 992298 , Reply# 6   4/27/2018 at 12:55 by mickeyd (Hamburg NY)        
Hi Glenn ~

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I swear by the Miracle Blue Goo; it works like Magic. Follow the cure length instructions--as if you would not, (ironic smile).

Post# 992315 , Reply# 7   4/27/2018 at 18:26 by mickeyd (Hamburg NY)        
RE: Email queries.

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Permatex Blue RTV Silicone Gasket Maker * IS * Miracle Blue Goo. One and the same. Just the nick name I've called it for decades. I'm sure it comes in many brands, but they all look and smell and seal the same--flawlessly. Excuse the confusion--must have had too big a sniff!

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