torque converter problem maybe?

[1984 elco]

I've got a 1984 elco with a 350 . It has a turbo 350 in it too. I'm hearing a knocking noise at idle and when I start driving, around 45mph to 65 I get a vibration. After 65 it goes away. I also notice if I mash the pedal at takeoff, it vibrates too. I'm also noticing oil leaking from around that area. And its motor oil, not transmission fluid. Any ideas? Thanks.

 

[chevy2480]

Converter sounds like its going bad had the same thing happen. Also vibrated at certian rpms. Or its a possibility your flexplate broke around the bolts holding it to crank. The oil is most likely the rear main seal going.

 

[RockSS]

Sounds like a cracked flex plate ... I wouldn't run it anymore untill you figure it out

 

[1984 elco]

Ok guys thanks for all the info. I've got this thing jacked up in the air, so I can figure this mess out. I'm gonna start with checking. Out the bolts holding the torque converter to the flex plate.