
Hoyt,
Glad to hear you got it running! If you're feeling a vibration, check your prop to see if the blades are all perfect. If so, check your runout on the prop with it running on the muffs. Unlikely, but your prop shaft may be bent. I can't think of anything else other than wallowed out transom mount bolts.
Later,
JBJ
You can take the box apart and try and lube it but you mostly likely need a new steering cable.