Sealent
Melting Slicks
Joined: May 2014
Posts: 2,898
Likes: 592
From: New Port Richey FL
I never have have on the earlier years (4+3) section T10 yes, but on my truck and 95 C4 I have used standard Typhlon sealant sparingly on the edges of thread
Last edited by s carter; May 2, 2026 at 10:24 AM.
Melting Slicks
Joined: Oct 2003
Posts: 2,198
Likes: 840
From: Chapel Hill NC
2025 c3 ('68-'73) of the Year Finalist - Unmodified
2025 C4 of the Year Finalist - Unmodified
2025 C8 Stingray of the Year Finalist - Unmodified
Ive never used sealant and never had a plug leak.
Racer
Joined: Jul 2023
Posts: 256
Likes: 87
Yes. Permatex liquid hi-temp thread sealant on both. Acts as a barrier against any galvanic thread corrosion as well. I had a fill plug sieze in a different transmission housing one time. No fun getting that out! This is a nice preventative. Certainly not required, but i think it helps 👍🏻
Melting Slicks
Joined: May 2014
Posts: 2,898
Likes: 592
From: New Port Richey FL
Yes. Permatex liquid hi-temp thread sealant on both. Acts as a barrier against any galvanic thread corrosion as well. I had a fill plug sieze in a different transmission housing one time. No fun getting that out! This is a nice preventative. Certainly not required, but i think it helps 👍🏻
