Thanks Ben,

I'm not a 3D pilot by any means. More FIA style I guess. Like working on smooth big maneuvers.

The gasser has a Hanson engine in it with stock X-Cell fan and gearing. 14 tooth pinion and 90 main gear. I also have Bergen CNC fan with 12 and 13 tooth pinions.

I pulled the Bergen stuff out when chasing down the vibration but that didn't change anything. I know now that the spindle was slightly bent and some other problems in the head.