[C2] Rear Diff Fill Plug Gasket Type
Thread Starter
Racer
Joined: May 2003
Posts: 312
Likes: 74
From: Double Oak TX.
Rear Diff Fill Plug Gasket Type
Well, I was working on my '64 rear diff to change the fluid and when I broke the fill plug loose to pump out the fluid, a piece of the flange cracked off. (not internally) So I ordered a replacement and it comes with a leather I think original type gasket. For the NCRS guys out there or anyone, do these work or do they leak? This is a driver car. I also ordered a copper gasket as well. Let me know your thoughts, thanks.
Tech Contributor
Joined: Aug 1999
Posts: 15,173
Likes: 3,982
From: Connecticut, USA
The 63-4 Diff covers had a steel vent and 1"-20 machine plug. They were both replaced by 1965. The plug came with a leather flat washer, seal. They didn't work too good. The machine threads would wick the oil out and why in 1965 they changed to a 3/4 npt plug. You can try teflon tape or make a seal and see if it works.
Le Mans Master
Joined: Mar 1999
Posts: 5,399
Likes: 985
From: Itasca IL
I’m dense, so I wasn’t aware of the 63-64 using the leather seal until this summer when I, too, found a cracked plug flange.
I got a new plug and gasket from CC—the threads were machined wrong. Took me a bit to find a used plug and the leather seal works fine.
I got a new plug and gasket from CC—the threads were machined wrong. Took me a bit to find a used plug and the leather seal works fine.
Tech Contributor
Joined: Aug 1999
Posts: 15,173
Likes: 3,982
From: Connecticut, USA
I've had good luck with Permatex gear-oil rtv,
https://www.amazon.com/Permatex-8118...98&sr=8-2&th=1
https://www.amazon.com/Permatex-8118...98&sr=8-2&th=1
