Drain Bolt Gasket

[camshaftit]

What is the original material for the oil drain bolt gasket?

Are the engine and trans drain bolt gaskets the same material?

Why use copper versus nylon?

[john302]

plastic is original

[JohnZ]

Manual transmissions only had a fill plug (no drain plug), and it was an NPT pipe plug; automatics had no drain plug either.

[Steve68]

Manual transmissions only had a fill plug (no drain plug), and it was an NPT pipe plug;

My original M22 has a drain plug (NPT pipe).

Steve

[BlackoutSteve]

Why use copper versus nylon?

Nylon will conform to irregularities in the pan & bolt head with much less torque than that of copper. It's much softer.
I use the nylon washer/gasket as supplied in the felpro gasket kits, and they work just fine. No leaks!

[JohnZ]

Manual transmissions only had a fill plug (no drain plug), and it was an NPT pipe plug;

My original M22 has a drain plug (NPT pipe).

Steve

Correct - original M22's had a drain plug, and all Muncies from 1970-up had one too; many pre-1970 Muncies had drain plugs added during rebuild as a convenience.

[9T4Z]

  automatics had no drain plug either.

Would someone please confirm this?   I've seen a number of TH350's with drain plugs...  don't look like replacement pans.

[sebastien]

powerglide transmissions have a drain plug as well don't they?