prop synch

[JeffAxel]

The prop synch on my '77 T337G is not working, at all. I believe it has been updated to the '78 and later configuration. Has anyone had problems with their prop sync, and does anyone have a recommendation regarding a shop that is familiar with this set up?? I understand it is shared with the 310. Any suggestions, and help would be much appreciated, the droning is driving me nuts!

Thanks!