68 G10, L6 250 dumping coolant out the back of the motor...

[VonFuct]

So I'm guessing the rear freeze plug rusted through or blew out but can anyone walk me through the process of replacing that one? I have to get the van back on the road today if at all possible. Thanks in advance!

[gfleduc]

68 G10, L6 250 dumping coolant out the back of the motor...

I would say the rear plug is a very good guess
You will need to pull the tranny & the flywheel(or flexplate) to expose it.

I believe you need a 2" plug; GM P/N's 3826505 / 3789860 / 3835121

Note: It is funny how many names there are for the plug - to name a few:

Core
Expansion (Chevy parts book)
Freeze
Welch