Touring E lt 2up vibration.

Hello guys. Getting some maint items together for the Doo. Last year I noticed when I revved it up with the track in the air the sled had a vibration. Not terrible, but still noticeable. My Arctic cat is smooth. It's not bad with the sled on a trail, it just feels very rough! I would think it should be smoother. The AC rides very nice, but the Doo just feels like driving a 40 year old car. Is that just the way they are? It's a 97. I'm replacing the spring anchors and the adjusters. I went through he skid last year and replaced a couple wheels and any bearings that were worn or rough. The only thing I didn't check was the drive axle bearing. Would that make it feel like it does? It's like something is out of balance. The motor seems smooth when I rev it with the belt off.

Hopefully that makes sense.
Any ideas?

Touring E lt 2up vibration.