1995- 850 wagon, non-turbo.
I am trying to iron out all the kinks in this car that I inherited...thus the frequent posts...He's something that really is getting to me: Vibration!
In Park/ Neutral ... rev...no issue. As you drive, vibration in the car...rumbling kinda feel and sound. I checked all motor mounts, nothing unusual. New exhaust hangers, no floppy exhaust. When at speed, if I drop it out of Drive, it feels like the 'feel' quiets some (not all), put it back into Drive...you can feel it.
Give me some options to explore, please.

There's lotsa stuff to check
I just replaced two motor mounts, a bad left ball joint
and crappy sway bar links. and have strut tower bushings on the UPS truck somewhere. All that stuff makes unhappiness when it's bad

Maybe you have crappy CV joints? What happens when you make a hard U-turn?
Do you hear any crappy clicks and thumps?

Good luck, Bill

Bad alignment will make the steering wheel vibrate. And the upper motor mount which goes on these cars, is a definite candidate. If it hasn't been done in a while, that might be a start. No way to tell from visual inspection.
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'97 855na, Mobil 1, K&N, various IPD's and eBay's