Diff fill plug gasket material....

[Steve L.]

...is this cork for a 73

[Joe L.]

Re: Diff fill plug gasket material....

...is this cork for a 73

Steve------


There is no gasket on 1973 differential filler plugs. In 1965 Corvette differentials changed to a tapered thread type plug that used no gasket. This plug was used through 1979.

[Steve L.]

Re: Diff fill plug gasket material....

Dr R. lists a gasket from 63 to 79.
I thought Mr Goodwrench turfed my gasket along with the red label just after he filled it with regular diff fluid which caused it to chatter.
Thanks Joe

[Joe L.]

Re: Diff fill plug gasket material....

Dr R. lists a gasket from 63 to 79.
I thought Mr Goodwrench turfed my gasket along with the red label just after he filled it with regular diff fluid which caused it to chatter.
Thanks Joe

Steve-----


There was no gasket originally used. However, these things often leak. It might be that Dr. Rebuild has developed some sort of gasket to help prevent this. It would be a difficult gasketing application, though, because of the design of the plug to accommodate the posi lube tag.

[Dan H.]

Re: Diff fill plug gasket material....

Steve, I used Loctite 545 thread sealant on my 64s plug, dry as a bone now, has posi disc etc as it should. The sealand works well on numerous other threaded joints, even fuel.
Dan

[Steve L.]

Re: Diff fill plug gasket material....

Thanks Joe,
Actually that was exactly what I was wondering...How would a gasket work considering that there is a plastic flag there. The cork gasket made me wonder about this, hence the post.

What I did was put some teflon tape on about half the leading threads so the tape doesn't show. I'll see how this works once I get things rolling.

I wasn't looking forward to unscrewing the plug to put the cork gasket in and having fluid leaking everywhere. I filled the diff when I had it on an engine stand and the back cover off so the fluid might be just above the fill hole.

[Dick W.]

Re: Diff fill plug gasket material....

Steve the tape will seal any leaks. Loctite Pipe Sealant w/Teflon (PST) is an easier way than tape.

[Gary R.]

Re: Diff fill plug gasket material....

I use Permatex high temp thread sealant on the fill and drain plug on every diff I build, no problems. Wipes clean. NAPA and the chain stores all have it.

[Joe L.]

Re: Diff fill plug gasket material....

Thanks Joe,
Actually that was exactly what I was wondering...How would a gasket work considering that there is a plastic flag there. The cork gasket made me wonder about this, hence the post.

What I did was put some teflon tape on about half the leading threads so the tape doesn't show. I'll see how this works once I get things rolling.

I wasn't looking forward to unscrewing the plug to put the cork gasket in and having fluid leaking everywhere. I filled the diff when I had it on an engine stand and the back cover off so the fluid might be just above the fill hole.

Steve------


By the way, just to confirm, did you actually obtain a gasket from Dr. Rebuild or did you just see such a gasket in their catalog?

In any event, I've got the straight scoop direct from Dr. Rebuild. The gasket shown in the catalog is NOT cork. Cork would not even work for an application like this. The gasket they have available is made from a dense, fiber material and they do not represent that this gasket was originally used for 65-79 applications..

[Steve L.]

Re: Diff fill plug gasket material....

Joe,
I noticed the gasket in the Dr. R catalog and made a note that I need one. I don't understand the statement "and they do not represent that this gasket was originally used for 65-79 applications.." since it is listed as 63 to 79. This is why I put it on my list. The AIM doesn't show this because it is in assembly. And it made sense that there should be something sealing this off. I was expecting some sort of nylon gasket with some sort of profile that would compensate for the red flag.

To save shipping costs, I actually ordered it from Long Island since I needed one of those sponge seals for the steering idler arm-they seem to be the only ones supplying these sponge seals. Both of these were listed for a '67. I know I shouldn't be mixing yrs but these are very minor items.

[Joe L.]

Re: Diff fill plug gasket material....

Joe,
I noticed the gasket in the Dr. R catalog and made a note that I need one. I don't understand the statement "and they do not represent that this gasket was originally used for 65-79 applications.." since it is listed as 63 to 79. This is why I put it on my list. The AIM doesn't show this because it is in assembly. And it made sense that there should be something sealing this off. I was expecting some sort of nylon gasket with some sort of profile that would compensate for the red flag.

To save shipping costs, I actually ordered it from Long Island since I needed one of those sponge seals for the steering idler arm-they seem to be the only ones supplying these sponge seals. Both of these were listed for a '67. I know I shouldn't be mixing yrs but these are very minor items.

Steve------


The key word is "originally". The Dr. Rebuild catalog does not say that the gasket they offer was originally used for all 1963-79 applications. In vast majority of the cases, the parts in the Dr. Rebuild catalog are as originally used for the application. However, every now-and-then they've come up with something for improved function which usually doesn't compromise apparent originality in any significant way. And, I suppose that every now-and-then, they can just make a mistake with an application reference. There are a fair number of these in GM P&A catalogs, too. For instance, in the case of differential filler plug gaskets, GM says that GM #3921989 is applicable for the differential filler plug gasket for 1953-74 applications. I can GUARANTEE you that this gasket is ABSOLUTELY NOT applicable to any 63-74 Corvette differential filler plug.

Some GM parts references say that GM #3923420 is a differential drain plug applicable to 57-67 Corvette applications. The problem is that none of these applications ever had a drain plug.

Also, the idler arm seals you mention were the same for 68-82 Corvettes as for 63-67. So, I suppose that this is a case where Long Island Corvette does sell parts for other than 63-67 Corvettes.

[Gary R.]

Re: Diff fill plug gasket material....

Save yourself needless hassle, 72's did not use a gasket nor did any using a npt thread.