I thought about it over and over yet never once did i test that there was gear oil in the transmission....

I recently replaced my broken trans with a shiny low milage 2005 neon nv-t350. I never had to open the gearbox, it was a direct bolt in replacement for me due to the hydraulic clutch bellhousing. I was Sooo certain there would have been no reason for the transmission to have been drained of its gear oil.. Until my engine started overheating. I fumbled with the coolant level and even oil level for an afternoon or two. All in all it got about 40 miles before i realized the horrible mistake I'd made.

I got the 2 quarts of 20 dollar a quart motherf$%cking gear oil and it still seems to shift fine so I am quite happy about that...

Well here is the question. What exactly in the transmission would most suffer from what I've put it through? Thanks all!