So after finally getting most of the fixin' done on my car (just need to swap tires, headlights, sway bars and eventually replace the headliner), I have decided that the next "major" thing I'm going to do is figure out the transmission leak.

I don't know if it's the transmission gasket itself, or the cooling lines. I have been told that the 850's are less inclined to leak from the gasket and more likely to leak from the cooling lines.

I haven't looked at it closely yet (it's in the street now and it's cold and dark so I won't be looking tonight). What I do know is the bottom of the transmission is where it's dripping from, and it's not so clear if it's coming from where the lines clip into the radiator itself.

IF it is the cooling lines, are the O-rings for those the same on both ends of the hoses? I have seen kits on line, but they seem to be for O-rings at the radiator connection, and not the transmission connection itself.

Do the lines into the transmissions connect to the transmission in a similar fashion to the ones that go into the radiator? Are they the same O-rings?
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1985 245. 246K Gone..but not forgotten. Sold in 2013, found 2018! Still running on the road. Of course. 1993 Volvo 850 soon to be gone

Different. The tranny end of the cooling lines are hard lines and have a different size O ring. Usually the flexible part of the line comes loose at the hard line connection, requiring a new flex line. The prices for replacement lines is over $100 each. If there are shops in your area that repair HVAC lines, they might be able to replace the flexible part of the line at a much cheaper cost. Same is true for turbo engines with oil cooler lines.
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Keeping it running is better than buying new

You know, life gets in the way of updating brickboard...

I found out that the reason my transmission was leaking was it was INCREDIBLY over-filled by the previous owner.

So I siphoned out a bunch of it and now it doesn't leak at all.

Yay!

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1985 245. 246K Gone..but not forgotten. Sold in 2013, found 2018! Still running on the road. Of course. 1993 Volvo 850 soon to be gone