Tranny problems

It seems that my Grizzly has some transmission issues. Is the transmission part of the engine on these units? I just parked the thing and will look at it tomorrow. It seems to be making a clunking sound and you can feel it. I did raise the wheels and ran it. It does this in two wheel drive.

Anyone else ever have this issue. I am hoping I do not have to split the engine case. My health is not that good and no way I am able to do this, not without help.

Tony