64 Differential Fill Plug Gasket

[Neil L.]

What type of gasket is used on a 64 differential fill plug. My parts book calls for a gasket, 3714775, which is discontinued. Paragon says it should be a copper washer. The only thread I could find in the archives dealt with the plug for 65-79.

[Dan H.]

Re: 64 Differential Fill Plug Gasket

Hi Neil, no matter what gasket you use, it will probably leak a little, especially with posi warning disc in place. Recommend Loctite 545 thread sealant in addition to a gasket, only way I got my 64 to quit weeping.
Dan

[Gary R.]

Re: 64 Differential Fill Plug Gasket

Some used an o-ring, look to see if there is an under cut on the plug. The 63-64 were a machine thread then they went to 3/4 npt plugs in 65.

[Joe L.]

Re: 64 Differential Fill Plug Gasket

What type of gasket is used on a 64 differential fill plug. My parts book calls for a gasket, 3714775, which is discontinued. Paragon says it should be a copper washer. The only thread I could find in the archives dealt with the plug for 65-79.

Neil------


I have some NOS examples of the GM #3714775 gasket. It appears to me to be cut from about 1/8" thick brown leather.

[Philip C.]

Re: 64 Differential Fill Plug Gasket

What type of gasket is used on a 64 differential fill plug. My parts book calls for a gasket, 3714775, which is discontinued. Paragon says it should be a copper washer. The only thread I could find in the archives dealt with the plug for 65-79.

Hi Neil Long Island sells a cork gasket. If thats all you need I'll pick one up and mail it to you, Iam putting my 63 together so Iam down there alot. Phil 8063

[John D.]

Re: 64 Differential Fill Plug Gasket

Dan, The Loctite 545 is a life safer. Probably one of the best Loctites made when it comes to fluids.
Must be or Cat and Harley D wouldn't use it on the assembly line.
Loctite 545 comes from industrial tool supply companies. Not auto stores.
My 63 Oil pan plug alway oozed a tad. Smeared it with 545 and no more leak.
Great for anything hydraulic.