350-np205 gasket - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67swb72klb · 11-30-2012, 08:01 PM

on my 72 the t/c adaptor was leaking trans fluid into t/c nothing visualy looks bad (seals or coupling shaft) and the seals were in rite ?
also there was no gasket for the adaptor to the t/c just a coat of silicone didnt leak so is it needed or not ? what do you guys think about all this
thanks in advance

**kwmech** · 12-03-2012, 01:26 PM

I think you need to take it apart and replace the seals and the gasket. On the T-350 side of the adapter is about a 4'' square cut "o" ring. On the inside is a 27 spline conversion sleeve that takes a seal on both sides. Then on the t-case side there is a gasket.

67swb72klb · 12-03-2012, 03:54 PM

kw i didnt see anything wrong with the seals or the spline coupling the vents seem to be ok on the t/case and the trans so i picked up a couple new seals cleaned everything up put it back in and i guess we will see what happens

**kwmech** · 12-03-2012, 04:09 PM

I forgot to mention the O ring on the t-case splines should also be replaced

67swb72klb · 12-03-2012, 10:09 PM

i didnt have any leaks till the t/case had a couple extra quarts of atf in it

RLONG · 12-04-2012, 05:36 PM

Have used for years atf leaking through just dont park on the concrete. some day will fix when i do rebuild.

11-30-2012, 08:01 PM	#1
67swb72klb Registered User Join Date: Dec 2010 Location: livingston co.mi Posts: 2,471	350-np205 gasket on my 72 the t/c adaptor was leaking trans fluid into t/c nothing visualy looks bad (seals or coupling shaft) and the seals were in rite ? also there was no gasket for the adaptor to the t/c just a coat of silicone didnt leak so is it needed or not ? what do you guys think about all this thanks in advance __________________ California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project

12-03-2012, 01:26 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,650	Re: 350-np205 gasket I think you need to take it apart and replace the seals and the gasket. On the T-350 side of the adapter is about a 4'' square cut "o" ring. On the inside is a 27 spline conversion sleeve that takes a seal on both sides. Then on the t-case side there is a gasket.

12-03-2012, 03:54 PM	#3
67swb72klb Registered User Join Date: Dec 2010 Location: livingston co.mi Posts: 2,471	Re: 350-np205 gasket kw i didnt see anything wrong with the seals or the spline coupling the vents seem to be ok on the t/case and the trans so i picked up a couple new seals cleaned everything up put it back in and i guess we will see what happens __________________ California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project

12-03-2012, 04:09 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,650	Re: 350-np205 gasket I forgot to mention the O ring on the t-case splines should also be replaced

12-03-2012, 10:09 PM	#5
67swb72klb Registered User Join Date: Dec 2010 Location: livingston co.mi Posts: 2,471	Re: 350-np205 gasket i didnt have any leaks till the t/case had a couple extra quarts of atf in it __________________ California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project

12-04-2012, 05:36 PM	#6
RLONG Registered User Join Date: Oct 2008 Location: BROOKELAND,TX Posts: 228	Re: 350-np205 gasket Have used for years atf leaking through just dont park on the concrete. some day will fix when i do rebuild.



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