Yesterday I was doing some heavy towing w/ swisher brush cutter and when I took on some hills, after running for a couple hours, I got some smoke. I finished climbing the last hill and shut down to cool off for a bit. After closer inspection I believe I see transmission fluid, just under transmission. Under the engine looks good and everything appears to be fine but should I be concerned or did I just push too hard? Should I assume there's a leak or could fluid escape some other way? Also, I did pop a wheelie the other day too which may also be a concern.

Any help greatly appreciated. btw, new to small motor maintenance. Please, take me for a dummy

Oh yeah, I did notice my chains are pretty darn dry too. Need to grease 'em up.

Thanks, Sean