I have a 98 4l80e and I got a used pump as the original was damaged. The new one has a plug in one of the ports, cooler port if I remember right, that the old one doesn't have. Anyone know about this. I will try to attach a pic.
Thanks

 

Looks like the front lube passage to me

 

Know why it would have that plug in it? The old one is open with a cap plug where this on has a rod blocking it off

 

Read this, it's better than me trying to explain it.
https://www.transgo.org/demo/06-177-...20matching.pdf

 

That's exactly what I'm looking for thank you! I couldn't find anything when i was googling it.