Pull the left rear chrome cover. The speedo sensor goes in the secondary housing and is held in by one bolt. pull that sensor out of the housing. I bet it is full of shavings. If it is ,you secondary it probably toast.
Also if you have a chrome cover over you driveshaft, on the swing pull it and check out you swing arm real good. I broke mine almost all the way around. Thought it was the tranny. Never saw it until I pulled the chrome drive shaft cover. Had my engine completely down and found the tranny was in good shape. Then the cover was pulled!!! and there it was!!!